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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2013	Jul. 31, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	ALEXANDERS INC
Entity Central Index Key	0000003499
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		5,106,196

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Real estate, at cost:
Land	$ 44,971	$ 44,971
Buildings and leasehold improvements	867,943	864,609
Development and construction in progress	3,410	2,212
Total	916,324	911,792
Accumulated depreciation and amortization	(173,068)	(160,826)
Real estate, net	743,256	750,966
Cash and cash equivalents	331,873	353,396
Restricted cash	88,964	90,395
Marketable securities	32,635	31,206
Tenant and other receivables, net of allowance for doubtful accounts of $2,125 and $2,219, respectively	2,301	1,953
Receivable arising from the straight-lining of rents	175,904	173,694
Deferred lease and other property costs, net, including unamortized leasing fees to Vornado of $38,435 and $39,910, respectively	52,482	54,461
Deferred debt issuance costs, net of accumulated amortization of $18,002 and $16,834, respectively	4,429	5,522
Other assets	37,728	20,217
Total assets	1,469,572	1,481,810
Liabilities and Equity
Mortgages payable	1,058,028	1,065,916
Amounts due to Vornado	44,883	46,445
Accounts payable and accrued expenses	29,835	33,621
Other liabilities	3,643	3,675
Total liabilities	1,136,389	1,149,657
Commitments and contingencies
Preferred stock: $1.00 par value per share; authorized, 3,000,000 shares; issued and outstanding, none	0	0
Common stock: $1.00 par value per share; authorized, 10,000,000 shares; issued, 5,173,450 shares; outstanding, 5,106,196 shares and 5,105,936 shares, respectively	5,173	5,173
Additional capital	29,745	29,352
Retained earnings	296,004	296,797
Accumulated other comprehensive income	2,635	1,206
Equity before treasury stock	333,557	332,528
Treasury stock: 67,254 shares and 67,514 shares, respectively, at cost	(374)	(375)
Total equity	333,183	332,153
Total liabilities and equity	$ 1,469,572	$ 1,481,810

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Assets
Allowance for doubtful accounts (in US Dollars)	$ 2,125	$ 2,219
Unamortized leasing fees to Vornado (in US Dollars)	38,435	39,910
Deferred debt issuance costs, accumulated amortization (in US Dollars)	$ 18,002	$ 16,834
Liabilities and Equity
Preferred stock: par value per share (in Dollars Per Share)	$ 1.00	$ 1.00
Preferred stock: authorized shares	3,000,000	3,000,000
Preferred stock: issued shares	0	0
Preferred stock: outstanding shares	0	0
Common stock: par value per share (in Dollars Per Share)	$ 1.00	$ 1.00
Common stock: authorized shares	10,000,000	10,000,000
Common stock: issued shares	5,173,450	5,173,450
Common stock: outstanding shares	5,106,196	5,105,936
Treasury stock: shares	67,254	67,514

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
REVENUES
Property rentals	$ 33,670	$ 33,482	$ 67,841	$ 67,255
Expense reimbursements	13,632	13,396	28,236	26,924
Total revenues	47,302	46,878	96,077	94,179
EXPENSES
Operating, including fees to Vornado of $1,002, $1,053, $1,984 and $2,085, respectively	14,476	14,198	30,030	28,739
Depreciation and amortization	7,235	7,169	14,458	14,352
General and administrative, including management fees to Vornado of $595, $540, $1,190 and $1,080, respectively	1,700	1,670	2,773	2,776
Total expenses	23,411	23,037	47,261	45,867
OPERATING INCOME	23,891	23,841	48,816	48,312
Interest and other income, net	388	36	773	70
Interest and debt expense	(11,140)	(11,311)	(22,288)	(22,784)
Income from continuing operations	13,139	12,566	27,301	25,598
Income from discontinued operations	0	6,672	0	13,064
Net income	13,139	19,238	27,301	38,662
Net income attributable to the noncontrolling interest	0	(346)	0	(288)
Net income attributable to Alexander's	$ 13,139	$ 18,892	$ 27,301	$ 38,374
Income per common share - basic and diluted:
Income from continuing operations (in dollars per share)	$ 2.57	$ 2.46	$ 5.34	$ 5.01
Income from discontinued operations, net (in dollars per share)	0	1.24	0	2.50
Net income per common share (in dollars per share)	$ 2.57	$ 3.70	$ 5.34	$ 7.51
Weighted average shares outstanding (in shares)	5,108,745	5,107,415	5,108,383	5,107,199
Dividends per common share (in dollars per share)	$ 2.75	$ 3.75	$ 5.50	$ 7.50

Consolidated Statements of Income (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Consolidated Statements of Income
Fees to Vornado	$ 1,002	$ 1,053	$ 1,984	$ 2,085
Management fees to Vornado	$ 595	$ 540	$ 1,190	$ 1,080

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 13,139	$ 19,238	$ 27,301	$ 38,662
Other comprehensive income:
Change in unrealized net gain on available-for-sale securities	(1,825)	0	1,429	0
Comprehensive income	11,314	19,238	28,730	38,662
Less: Comprehensive income attributable to the noncontrolling interest	0	(346)	0	(288)
Comprehensive income attributable to Alexander's	$ 11,314	$ 18,892	$ 28,730	$ 38,374

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

+ References

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Capital	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Shares Issued, Beginning Balance at Dec. 31, 2011		5,173,000
Balance, at Dec. 31, 2011	$ 363,245	$ 5,173	$ 31,801	$ 322,201		$ (375)	$ 4,445
Net income	38,662			38,374			288
Dividends paid	(38,303)			(38,303)
Change in unrealized net gain on available-for-sale securities	0
Deferred stock unit grant	300		300
Shares Issued, Ending Balance at Jun. 30, 2012		5,173,000
Balance, at Jun. 30, 2012	$ 363,904	$ 5,173	32,101	322,272		(375)	4,733
Shares Issued, Beginning Balance at Dec. 31, 2012	5,173,450	5,173,450
Balance, at Dec. 31, 2012	$ 332,153	$ 5,173	29,352	296,797	$ 1,206	(375)	0
Net income	27,301			27,301			0
Dividends paid	(28,094)			(28,094)
Change in unrealized net gain on available-for-sale securities	1,429				1,429
Deferred stock unit grant	394		394
Other	$ 0		(1)			1
Shares Issued, Ending Balance at Jun. 30, 2013	5,173,450	5,173,450
Balance, at Jun. 30, 2013	$ 333,183	$ 5,173	$ 29,745	$ 296,004	$ 2,635	$ (374)	$ 0

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References + Details

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 27,301	$ 38,662
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	15,660	18,970
Straight-lining of rental income	(2,210)	(2,664)
Stock-based compensation expense	394	300
Change in operating assets and liabilities:
Tenant and other receivables, net	(348)	351
Other assets	(17,772)	(24,935)
Amounts due to Vornado	(1,562)	(860)
Accounts payable and accrued expenses	(5,099)	(577)
Other liabilities	(32)	(1)
Net cash provided by operating activities	16,332	29,246
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(3,219)	(5,128)
Restricted cash	1,431	(855)
Proceeds from maturing short-term investments	0	5,000
Net cash used in investing activities	(1,788)	(983)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid	(28,094)	(38,303)
Debt repayments	(7,888)	(7,400)
Debt issuance costs	(85)	(400)
Net cash used in financing activities	(36,067)	(46,103)
Net decrease in cash and cash equivalents	(21,523)	(17,840)
Cash and cash equivalents at beginning of period	353,396	506,619
Cash and cash equivalents at end of period	331,873	488,779
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest	21,107	23,967
NON-CASH TRANSACTIONS
Non-cash additions to real estate included in accounts payable and accrued expenses	2,284	1,349
Change in unrealized net gain on available-for-sale securities	1,429	0
Write-off of fully amortized and depreciated assets	$ 0	$ 624

Organization

6 Months Ended

Jun. 30, 2013

Organization [Abstract]

Nature Of Operations [Text Block]

1. Organization

Alexander's, Inc. (NYSE: ALX) is a real estate investment trust (“REIT”), incorporated in Delaware, engaged in leasing, managing, developing and redeveloping its properties. All references to “we,” “us,” “our,” “Company” and “Alexander's” refer to Alexander's, Inc. and its consolidated subsidiaries. We are managed by, and our properties are leased and developed by, Vornado Realty Trust (“Vornado”) (NYSE: VNO).

Basis of Presentation

6 Months Ended

Jun. 30, 2013

Basis of Presentation [Abstract]

Basis of Presentation [Text Block]

2. Basis of Presentation

The accompanying consolidated financial statements are unaudited and include the accounts of Alexander's and its consolidated subsidiaries. All intercompany amounts have been eliminated. In our opinion, all adjustments (which include only normal recurring adjustments) necessary to present fairly the financial position, results of operations and changes in cash flows have been made. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted. These condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q of the Securities and Exchange Commission (the “SEC”) and should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2012, as filed with the SEC.

We have made estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. The results of operations for the three and six months ended June 30, 2013 are not necessarily indicative of the operating results for the full year. Certain prior year balances have been reclassified in order to conform to current year presentation.

We currently operate in one business segment.

Recently Issued Accounting Literature

6 Months Ended

Jun. 30, 2013

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recently Issued Accounting Literature [Text Block]

3. Recently Issued Accounting Literature

In February 2013, the Financial Accounting Standards Board issued Update No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU No. 2013-02”). ASU No. 2013-02 requires additional disclosures regarding significant reclassifications out of each component of accumulated other comprehensive income, including the effect on the respective line items of net income for amounts that are required to be reclassified into net income in their entirety and cross-references to other disclosures providing additional information for amounts that are not required to be reclassified into net income in their entirety. The adoption of this update as of January 1, 2013, did not have any impact on our consolidated financial statements.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
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+ Details

Relationship with Vornado

6 Months Ended

Jun. 30, 2013

Relationship with Vornado [Text Block]

4. Relationship with Vornado

At June 30, 2013, Vornado owned 32.4% of our outstanding common stock. We are managed by, and our properties are leased and developed by, Vornado, pursuant to the agreements described below which expire in March of each year and are automatically renewable.

Management and Development Agreements

We pay Vornado an annual management fee equal to the sum of (i) $2,800,000, (ii) 2% of gross revenue from the Rego Park II shopping center, (iii) $0.50 per square foot of the tenant-occupied office and retail space at 731 Lexington Avenue and (iv) $272,000, escalating at 3% per annum, for managing the common area of 731 Lexington Avenue.

In addition, Vornado is entitled to a development fee of 6% of development costs, as defined.

Leasing Agreements

Vornado also provides us with leasing services for a fee of 3% of rent for the first ten years of a lease term, 2% of rent for the eleventh through the twentieth year of a lease term, and 1% of rent for the twenty-first through thirtieth year of a lease term, subject to the payment of rents by tenants. In the event third-party real estate brokers are used, the fees to Vornado increase by 1% and Vornado is responsible for the fees to the third-party real estate brokers. Vornado is also entitled to a commission upon the sale of any of our assets equal to 3% of gross proceeds, as defined, for asset sales less than $50,000,000 and 1% of gross proceeds, as defined, for asset sales of $50,000,000 or more. The total of these amounts is payable in annual installments in an amount not to exceed $4,000,000, with interest on the unpaid balance at one-year LIBOR plus 1.0% (1.84% at June 30, 2013).

Other Agreements

We also have agreements with Building Maintenance Services, a wholly owned subsidiary of Vornado, to supervise (i) cleaning, engineering and security services at our Lexington Avenue property and (ii) security services at our Rego Park I and Rego Park II properties, for an annual fee equal to the cost of such services plus 6%.

The following is a summary of fees to Vornado under the various agreements discussed above, and includes $666,000 and $1,398,000 of property management and leasing fees in the three and six months ended June 30, 2012, respectively, related to the Kings Plaza Regional Shopping Center (“Kings Plaza”), which was sold in November 2012 (see Note 6 – Discontinued Operations).

		Three Months Ended				Six Months Ended
		June 30,				June 30,
(Amounts in thousands)		2013		2012		2013		2012
Company management fees		$	700	$	750	$	1,400	$	1,500
Development fees			-		187		-		375
Leasing fees			292		1,006		678		1,629
Property management fees and payments for cleaning, engineering
	and security services		897		1,275		1,774		2,542
		$	1,889	$	3,218	$	3,852	$	6,046

At June 30, 2013, we owed Vornado $44,481,000 for leasing fees and $402,000 for management, property management and cleaning fees.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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-Paragraph 5
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
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-Name Accounting Standards Codification
-Topic 850
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-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph b
-Article 3A

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph k
-Article 4

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 57
-Paragraph 1-4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Marketable Securities

6 Months Ended

Jun. 30, 2013

Marketable Securities [Abstract]

Marketable Securities [Text Block]

5. Marketable Securities

As of June 30, 2013, we own 535,265 common shares of The Macerich Company (NYSE: MAC) (“Macerich”), which were received in connection with the sale of Kings Plaza to Macerich. These shares have an economic cost of $56.05 per share, or $30,000,000 in the aggregate. As of June 30, 2013, these shares have a fair value of $32,635,000, based on Macerich's closing share price of $60.97 per share. These shares are included in “marketable securities” on our consolidated balance sheets and are classified as available-for-sale. Available-for-sale securities are presented at fair value. Unrealized gains and losses resulting from the mark-to-market of these securities are included in “other comprehensive income.” The three and six months ended June 30, 2013 include an unrealized loss of $1,825,000 and an unrealized gain of $1,429,000, respectively, from the mark-to-market of these securities.

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Glossary Debt Security
-URI http://asc.fasb.org/extlink&oid=6509901

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 3, 19, 20, 21, 22, 137
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Discontinued Operations

6 Months Ended

Jun. 30, 2013

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations [Text Block]

6. Discontinued Operations

In accordance with the provisions of Accounting Standards Codification (“ASC”) Topic 360, Property, Plant and Equipment, we have reclassified the revenues and expenses of Kings Plaza, which was sold in November 2012, to “income from discontinued operations” for all periods on our consolidated statements of income. The table below sets forth the results of operations of Kings Plaza for the three and six months ended June 30, 2012.

		Three Months Ended				Six Months Ended
		June 30,				June 30,
(Amounts in thousands)			2013		2012		2013		2012
Total revenues		$	-	$	16,724	$	-	$	33,083
Total expenses⁽¹⁾			-		10,052		-		20,019
Income from discontinued operations		$	-	$	6,672	$	-	$	13,064
___________________
(1)	Includes fees to Vornado of $432 and $877 in the three and six months ended June 30, 2012, respectively.

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43-48
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+ Details

Significant Tenants

6 Months Ended

Jun. 30, 2013

Significant Tenants [Abstract]

Significant Tenants [Text Block]

7. Significant Tenants

Bloomberg L.P. (“Bloomberg”) accounted for $43,322,000 and $42,395,000, representing 45% of our total revenues in each of the six-month periods ended June 30, 2013 and 2012, respectively. No other tenant accounted for more than 10% of our total revenues. If we were to lose Bloomberg as a tenant, or if Bloomberg were to fail or become unable to fulfill its obligations under its lease, it would adversely affect our results of operations and financial condition. We receive and evaluate certain confidential financial information and metrics from Bloomberg on a semi-annual basis. In addition, we access and evaluate financial information regarding Bloomberg from private sources, as well as publicly available data.

- Definition

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher AICPA
-Name Statement of Position (SOP)
-Number 94-6
-Paragraph 21, 22, 24
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
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+ Details

Mortgages Payable

6 Months Ended

Jun. 30, 2013

Notes and Mortgages Payable [Abstract]

Mortgages Payable [Text Block]

8. Mortgages Payable

The following is a summary of our outstanding mortgages payable. We may refinance our maturing debt as it comes due or choose to repay it at maturity.

						Balance at
				Interest Rate at		June 30,		December 31,
(Amounts in thousands)			Maturity	June 30, 2013		2013		2012
First mortgages secured by:
	731 Lexington Avenue, office space		Feb. 2014	5.33	%	$	320,886	$	327,425
	Rego Park I shopping center (100% cash
		collateralized)	Mar. 2015	0.40	%		78,246		78,246
	731 Lexington Avenue, retail space⁽¹⁾		Jul. 2015	4.93	%		320,000		320,000
	Paramus		Oct. 2018	2.90	%		68,000		68,000
	Rego Park II shopping center⁽²⁾		Nov. 2018	2.05	%		270,896		272,245
						$	1,058,028	$	1,065,916


(1)	This loan is non-recourse to us, except for $75,000 in the event of a substantial casualty, as defined.
(2)	This loan bears interest at LIBOR plus 1.85%.

Fair Value Measurements

6 Months Ended

Jun. 30, 2013

Fair Value [Abstract]

Fair Value Measurements [Text Block]

9. Fair Value Measurements

ASC 820, Fair Value Measurement and Disclosures defines fair value and establishes a framework for measuring fair value. ASC 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 – quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 – observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 – unobservable inputs that are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as consider counterparty credit risk in our assessment of fair value.

Financial Assets and Liabilities Measured at Fair Value

Financial assets measured at fair value on our consolidated balance sheets at June 30, 2013 and December 31, 2012, consist solely of marketable securities, which is presented in the table below, based on its level in the fair value hierarchy. There were no financial liabilities measured at fair value at June 30, 2013 and December 31, 2012.

		As of June 30, 2013
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	32,635	$	32,635	$	-	$	-

		As of December 31, 2012
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	31,206	$	31,206	$	-	$	-

9. Fair Value Measurements – continued

Financial Assets and Liabilities not Measured at Fair Value

Financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash equivalents, mortgages payable and leasing commissions due to Vornado. Cash equivalents are carried at cost, which approximates fair value due to their short-term maturities. The fair value of our mortgages payable is calculated by discounting the future contractual cash flows of these instruments using current risk-adjusted rates available to borrowers with similar credit ratings, which are provided by a third-party specialist. The leasing commissions due to Vornado are carried at cost plus interest at variable rates, which approximate fair value. The fair value of cash equivalents (primarily U.S. Treasury bills and money market funds) is classified as Level 1 and the fair value of mortgages payable and leasing commissions due to Vornado is classified as Level 2. The table below summarizes the carrying amounts and fair value of these financial instruments as of June 30, 2013 and December 31, 2012.

			As of June 30, 2013				As of December 31, 2012
			Carrying		Fair		Carrying		Fair
(Amounts in thousands)			Amount		Value		Amount		Value
Assets:
	Cash equivalents	$	318,682	$	318,682	$	289,054	$	289,054

Liabilities:
	Mortgages payable	$	1,058,028	$	1,101,000	$	1,065,916	$	1,097,000
	Leasing commissions (included in Amounts due to Vornado)		44,481		44,000		45,803		46,000
		$	1,102,509	$	1,145,000	$	1,111,719	$	1,143,000

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Stock-Based Compensation

6 Months Ended

Jun. 30, 2013

Stock-Based Compensation [Abstract]

Stock-Based Compensation [Text Block]

10. Stock-Based Compensation

We account for stock-based compensation in accordance with ASC 718, Compensation – Stock Compensation. Our Omnibus Stock Plan (the “Plan”) provides for grants of incentive and non-qualified stock options, restricted stock, stock appreciation rights, deferred stock units (“DSUs”) and performance shares, as defined, to the directors, officers and employees of the Company and Vornado.

In May 2013, the Company granted each of the members of its Board of Directors 243 DSUs with a grant date fair value of $56,250 per grant, or $394,000 in the aggregate. The DSUs entitle the holder to receive shares of the Company's common stock without the payment of any consideration. The DSUs vested immediately and accordingly, were expensed on the date of grant, but the shares of common stock underlying the DSUs are not deliverable to the grantee until the grantee is no longer serving on the Company's Board of Directors.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

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-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and Contingencies

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies [Abstract]

Commitments and Contingencies [Text Block]

11. Commitments and Contingencies

Insurance

We maintain general liability insurance with limits of $300,000,000 per occurrence and all-risk property and rental value insurance coverage with limits of $1.7 billion per occurrence, including coverage for terrorist acts, with sub-limits for certain perils such as floods and earthquakes on each of our properties.

Fifty Ninth Street Insurance Company, LLC (“FNSIC”), our wholly owned consolidated subsidiary, acts as a direct insurer for coverage for acts of terrorism, including nuclear, biological, chemical and radiological (“NBCR”) acts, as defined by the Terrorism Risk Insurance Program Reauthorization Act of 2007 (“TRIPRA”). Coverage for acts of terrorism (including NBCR acts) is up to $1.7 billion per occurrence. Coverage for acts of terrorism (excluding NBCR acts) is fully reinsured by third party insurance companies with no exposure to FNSIC. For NBCR acts, FNSIC is responsible for a $275,000 deductible and 15% of the balance of a covered loss and the Federal government is responsible for the remaining 85% of a covered loss. We are ultimately responsible for any loss borne by FNSIC.

There can be no assurance that we will be able to maintain similar levels of insurance coverage in the future in amounts and on terms that are commercially reasonable. We are responsible for deductibles and losses in excess of our insurance coverage, which could be material.

Our mortgage loans are non-recourse to us, except for $75,000,000 of the $320,000,000 mortgage on our 731 Lexington Avenue property, in the event of a substantial casualty, as defined. Our mortgage loans contain customary covenants requiring us to maintain insurance. If lenders insist on greater coverage than we are able to obtain, it could adversely affect our ability to finance our properties.

Flushing Property

In 2002, Flushing Expo, Inc. (“Expo”) agreed to purchase the stock of the entity which owns the Flushing property from us (“Purchase of the Property”) and gave us a non-refundable deposit of $1,875,000. Pursuant to a stipulation of settlement, we settled the action Expo brought against us regarding the Purchase of the Property and in June 2011, deposited the settlement amount with the Court, in exchange for which we received a stipulation of discontinuance, with prejudice, as well as general releases. In November 2011, Expo filed another action, this time against our tenant at the Flushing property asserting, among other things, that such tenant interfered with Expo's Purchase of the Property from us and sought $50,000,000 in damages from our tenant, who sought indemnification from us for such amount. In August 2012, the Court entered judgment denying Expo's claim for damages. Expo filed a motion to re-argue the decision, which the Court denied on December 7, 2012. Expo has appealed the Court's August 2012 decision. We believe, after consultation with counsel, that the amount or range of reasonably possible losses, if any, cannot be estimated.

Paramus

In 2001, we leased 30.3 acres of land located in Paramus, New Jersey to IKEA Property, Inc. The lease has a 40-year term with a purchase option in 2021 for $75,000,000. The property is encumbered by a $68,000,000 interest-only mortgage loan with a fixed rate of 2.90%, which matures in October 2018. The annual triple-net rent is the sum of $700,000 plus the amount of debt service on the mortgage loan. If the purchase option is exercised, we will receive net cash proceeds of approximately $7,000,000 and recognize a gain on sale of land of approximately $60,000,000. If the purchase option is not exercised, the triple-net rent for the last 20 years would include debt service sufficient to fully amortize $68,000,000 over the remaining 20-year lease term.

Letters of Credit

Approximately $4,058,000 of standby letters of credit were outstanding as of June 30, 2013.

Other

There are various other legal actions against us in the ordinary course of business. In our opinion, the outcome of such matters in the aggregate will not have a material effect on our financial condition, results of operations or cash flows.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
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-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Rego Park II Apartment Tower

6 Months Ended

Jun. 30, 2013

Real Estate Owned Disclosure Of Detailed Components [Abstract]

Real Estate Disclosure [Text Block]

12. Rego Park II Apartment Tower

We have commenced the construction of an apartment tower, which will contain approximately 300 units aggregating 250,000 square feet, above our Rego Park II shopping center. The capital expenditures related to the proposed development are expected to be approximately $125,000,000. There can be no assurance that the project will be completed on schedule, or within budget.

- Definition

The entire disclosure for certain real estate investment financial statements, real estate investment trust operating support agreements, real estate owned, retail land sales, time share transactions, as well as other real estate related disclosures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 970
-SubTopic 360
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-28)
-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 11
-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 66
-Paragraph 4, 5, 37, 50, 59, 65, 95, 97
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 154
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 67
-Paragraph 4, 5, 6, 7
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Number 57
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 7, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Federal Regulation (FR)
-Number Title 12
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-Paragraph 10
-Subparagraph a, b
-Chapter V
-Subsection I
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-Publisher SEC
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-Section 04
-Paragraph c
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-Article 5

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-Name Accounting Research Bulletin (ARB)
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-Chapter 3
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-Name Audit and Accounting Guide (AAG)
-Number AAG-DEP
-Paragraph 2, 6, 9-11, 18, 20
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-Chapter 11
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Position (SOP)
-Number 01-6
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-Subparagraph f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 15
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Reference 21: http://www.xbrl.org/2003/role/presentationRef
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-Name FASB Interpretation (FIN)
-Number 46R
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings Per Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

13. Earnings Per Share

The following table sets forth the computation of basic and diluted income per share, including a reconciliation of net income and the number of shares used in computing basic and diluted income per share. Basic income per share is determined using the weighted average shares of common stock (including DSUs) outstanding during the period. Diluted income per share is determined using the weighted average shares of common stock (including DSUs) outstanding during the period, and assumes all potentially dilutive securities were converted into common shares at the earliest date possible. There were no potentially dilutive securities outstanding during the three and six months ended June 30, 2013 and 2012.

			Three Months Ended				Six Months Ended
			June 30,				June 30,
(Amounts in thousands, except share and per share amounts)			2013		2012		2013		2012
	Income from continuing operations		$	13,139	$	12,566	$	27,301	$	25,598
	Income from discontinued operations, net of income
		attributable to the noncontrolling interest		-		6,326		-		12,776
	Net income attributable to common
		stockholders – basic and diluted	$	13,139	$	18,892	$	27,301	$	38,374

	Weighted average shares outstanding – basic and diluted			5,108,745		5,107,415		5,108,383		5,107,199

	Income from continuing operations		$	2.57	$	2.46	$	5.34	$	5.01
	Income from discontinued operations, net			-		1.24		-		2.50
	Net income per common share – basic and diluted		$	2.57	$	3.70	$	5.34	$	7.51

Basis of Presentation (Policy)

6 Months Ended

Jun. 30, 2013

Basis of Presentation [Abstract]

Basis Of Accounting Policy [Policy Text Block]

2. Basis of Presentation

We currently operate in one business segment.

Recently Issued Accounting Literature (Policy)

6 Months Ended

Jun. 30, 2013

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recently Issued Accounting Literature [Policy Text Block]

3. Recently Issued Accounting Literature

Marketable Securities (Policy)	6 Months Ended
Marketable Securities (Policy)	Jun. 30, 2013
Marketable Securities [Abstract]
Marketable Securities, Available-for-sale Securities, Policy [Policy Text Block]	Available-for-sale securities are presented at fair value. Unrealized gains and losses resulting from the mark-to-market of these securities are included in “other comprehensive income.

- Definition

Disclosure of accounting policy for investments in debt and equity securities that are classified as available-for-sale. This policy also may describe the entity's accounting treatment for transfers between investment categories, how the entity determines whether impairments of available-for-sale securities are other than temporary, and how the fair values of such securities are determined.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196929

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10, 11
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section M

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12, 13, 14, 15, 16
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 2, 12
-Article 5

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 7, 8, 9, 13, 14, 15, 16, 17
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+ Details

Fair Value Measurements (Policy)	6 Months Ended
Fair Value Measurements (Policy)	Jun. 30, 2013
Fair Value [Abstract]
Fair Value Measurement, Policy	In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as consider counterparty credit risk in our assessment of fair value.

Stock Based Compensation (Policy)	6 Months Ended
Stock Based Compensation (Policy)	Jun. 30, 2013
Stock-Based Compensation [Abstract]
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]	We account for stock-based compensation in accordance with ASC 718, Compensation – Stock Compensation.

- Definition

Disclosure of accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.

+ References + Details

Relationship with Vornado (Tables)

6 Months Ended

Jun. 30, 2013

Summary of Fees to Vornado [Table Text Block]

		Three Months Ended				Six Months Ended
		June 30,				June 30,
(Amounts in thousands)		2013		2012		2013		2012
Company management fees		$	700	$	750	$	1,400	$	1,500
Development fees			-		187		-		375
Leasing fees			292		1,006		678		1,629
Property management fees and payments for cleaning, engineering
	and security services		897		1,275		1,774		2,542
		$	1,889	$	3,218	$	3,852	$	6,046

Discontinued Operations (Tables)

6 Months Ended

Jun. 30, 2013

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations [Table Text Block]

		Three Months Ended				Six Months Ended
		June 30,				June 30,
(Amounts in thousands)			2013		2012		2013		2012
Total revenues		$	-	$	16,724	$	-	$	33,083
Total expenses⁽¹⁾			-		10,052		-		20,019
Income from discontinued operations		$	-	$	6,672	$	-	$	13,064
___________________
(1)	Includes fees to Vornado of $432 and $877 in the three and six months ended June 30, 2012, respectively.

- Definition

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

+ References + Details

Mortgages Payable (Tables)

6 Months Ended

Jun. 30, 2013

Notes and Mortgages Payable [Abstract]

Schedule of Mortgages Payable [Table Text Block]

						Balance at
				Interest Rate at		June 30,		December 31,
(Amounts in thousands)			Maturity	June 30, 2013		2013		2012
First mortgages secured by:
	731 Lexington Avenue, office space		Feb. 2014	5.33	%	$	320,886	$	327,425
	Rego Park I shopping center (100% cash
		collateralized)	Mar. 2015	0.40	%		78,246		78,246
	731 Lexington Avenue, retail space⁽¹⁾		Jul. 2015	4.93	%		320,000		320,000
	Paramus		Oct. 2018	2.90	%		68,000		68,000
	Rego Park II shopping center⁽²⁾		Nov. 2018	2.05	%		270,896		272,245
						$	1,058,028	$	1,065,916


(1)	This loan is non-recourse to us, except for $75,000 in the event of a substantial casualty, as defined.
(2)	This loan bears interest at LIBOR plus 1.85%.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value [Abstract]

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		As of June 30, 2013
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	32,635	$	32,635	$	-	$	-

		As of December 31, 2012
(Amounts in thousands)		Total		Level 1		Level 2		Level 3
	Marketable securities	$	31,206	$	31,206	$	-	$	-

Fair Value, by Balance Sheet Grouping [Table Text Block]

			As of June 30, 2013				As of December 31, 2012
			Carrying		Fair		Carrying		Fair
(Amounts in thousands)			Amount		Value		Amount		Value
Assets:
	Cash equivalents	$	318,682	$	318,682	$	289,054	$	289,054

Liabilities:
	Mortgages payable	$	1,058,028	$	1,101,000	$	1,065,916	$	1,097,000
	Leasing commissions (included in Amounts due to Vornado)		44,481		44,000		45,803		46,000
		$	1,102,509	$	1,145,000	$	1,111,719	$	1,143,000

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

- Definition

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 19
-Subparagraph a, b, c(1), d(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15
-Subparagraph b-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
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-Subparagraph c(2), d, e, f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph a, c(1), c(2), c(3), d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

			Three Months Ended				Six Months Ended
			June 30,				June 30,
(Amounts in thousands, except share and per share amounts)			2013		2012		2013		2012
	Income from continuing operations		$	13,139	$	12,566	$	27,301	$	25,598
	Income from discontinued operations, net of income
		attributable to the noncontrolling interest		-		6,326		-		12,776
	Net income attributable to common
		stockholders – basic and diluted	$	13,139	$	18,892	$	27,301	$	38,374

	Weighted average shares outstanding – basic and diluted			5,108,745		5,107,415		5,108,383		5,107,199

	Income from continuing operations		$	2.57	$	2.46	$	5.34	$	5.01
	Income from discontinued operations, net			-		1.24		-		2.50
	Net income per common share – basic and diluted		$	2.57	$	3.70	$	5.34	$	7.51

Basis of Presentation (Details)	6 Months Ended
Basis of Presentation (Details)	Jun. 30, 2013 Segment
Basis of Presentation [Abstract]
Number Of Operating Segments	1

Relationship with Vornado (Details)	3 Months Ended		6 Months Ended
Relationship with Vornado (Details)	Jun. 30, 2013 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2013 USD ($) $ / ft²	Jun. 30, 2012 USD ($)
Managment And Development Agreement [Abstract]
Property Management Fee agreement			We pay Vornado an annual management fee equal to the sum of (i) $2,800,000, (ii) 2% of gross revenue from the Rego Park II shopping center, (iii) $0.50 per square foot of the tenant-occupied office and retail space at 731 Lexington Avenue and (iv) $272,000, escalating at 3% per annum, for managing the common area of 731 Lexington Avenue. In addition, Vornado is entitled to a development fee of 6% of development costs, as defined.
Leasing Agreement [Abstract]
Leasing service fee payable, description			Vornado also provides us with leasing services for a fee of 3% of rent for the first ten years of a lease term, 2% of rent for the eleventh through the twentieth year of a lease term, and 1% of rent for the twenty-first through thirtieth year of a lease term, subject to the payment of rents by tenants. In the event third-party real estate brokers are used, the fees to Vornado increase by 1% and Vornado is responsible for the fees to the third-party real estate brokers.
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	32.40%		32.40%
Managment And Development Agreement [Abstract]
Management Fee Agreement Value (in US Dollars)			$ 2,800,000
Leasing Agreement [Abstract]
Asset sale commission threshold (in US Dollars)			$ 50,000,000
Percentage Commissions On Sale Of Assets Under Fifty Million			3.00%
Percentage Commissions On Sale Of Assets Over Fifty Million			1.00%
Leasing services fee and commission on asset sale, annual installment, maximum (in US Dollars)			$ 4,000,000
Debt Instrument, Description of Variable Rate Basis			LIBOR
Basis spread over LIBOR	1.00%		1.00%
Unpaid Balance Effective Interest	1.84%		1.84%
Other Agreements [Abstract]
Other Supervisory Fees			6.00%
Fees to Related Party	$ 1,889,000	$ 3,218,000	$ 3,852,000	$ 6,046,000
Affiliated Entity [Member] \| Lexington Avenue Property [Member] \| Office And Retail Space [Member]
Managment And Development Agreement [Abstract]
Property Management Fee Agreement Price Per Square Foot \| $ / ft²			0.5
Affiliated Entity [Member] \| Lexington Avenue Property [Member] \| Common Area [Member]
Managment And Development Agreement [Abstract]
Property Management Fee Agreement Value (in US Dollars)			$ 272,000
Property Management Fee Escalation Percentage Per Annum			3.00%
Affiliated Entity [Member] \| Rego Park 2 Property [Member]
Managment And Development Agreement [Abstract]
Property Management Fee Agreement Percentage Of Gross Revenue			2.00%
Affiliated Entity [Member] \| Development fees [Member]
Managment And Development Agreement [Abstract]
Development fee as percentage of development costs			6.00%
Other Agreements [Abstract]
Fees to Related Party	0	187,000	$ 0	375,000
Affiliated Entity [Member] \| Leasing Fees [Member]
Leasing Agreement [Abstract]
Lease Fee Percentage Of Rent One To Ten Years			3.00%
Lease Fee Percentage Of Rent Eleven To Twenty Years			2.00%
Lease Fee Percentage Of Rent Twenty First To Thirty Years			1.00%
Percentage Increase Lease Fee If Broker Used			1.00%
Other Agreements [Abstract]
Fees owed to Vornado	(44,481,000)		$ (44,481,000)
Fees to Related Party	292,000	1,006,000	678,000	1,629,000
Affiliated Entity [Member] \| Property Management Fees [Member]
Other Agreements [Abstract]
Fees owed to Vornado	(402,000)		(402,000)
Fees to Related Party	$ 897,000	1,275,000	$ 1,774,000	2,542,000
Affiliated Entity [Member] \| Property Management Fees [Member] \| Kings Plaza Regional Shopping Center [Member]
Other Agreements [Abstract]
Fees to Related Party		$ 666,000		$ 1,398,000

Relationship with Vornado: Summary of Fees (Details) - Affiliated Entity [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Related Party Transaction [Line Items]
Fees to Related Party (in US Dollars)	$ 1,889	$ 3,218	$ 3,852	$ 6,046
Company Management Fees [Member]
Related Party Transaction [Line Items]
Fees to Related Party (in US Dollars)	700	750	1,400	1,500
Development fees [Member]
Related Party Transaction [Line Items]
Fees to Related Party (in US Dollars)	0	187	0	375
Leasing Fees [Member]
Related Party Transaction [Line Items]
Fees to Related Party (in US Dollars)	292	1,006	678	1,629
Property Management Fees [Member]
Related Party Transaction [Line Items]
Fees to Related Party (in US Dollars)	$ 897	$ 1,275	$ 1,774	$ 2,542

Marketable Securities (Details) - USD ($)	3 Months Ended		6 Months Ended
Marketable Securities (Details) - USD ($)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule Of Available For Sale Securities [Line Items]
Change in unrealized net gain on available-for-sale securities	$ (1,825,000)	$ 0	$ 1,429,000	$ 0
Macerich Interest [Member]
Schedule Of Available For Sale Securities [Line Items]
Macerich common shares	535,265		535,265
Economic basis per share			$ 56.05
GAAP Cost	$ 30,000,000		$ 30,000,000
Fair Value	$ 32,635,000		$ 32,635,000
Closing share price (in dollars per share)	$ 60.97		$ 60.97
Change in unrealized net gain on available-for-sale securities	$ (1,825,000)		$ 1,429,000

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name FASB Staff Position (FSP)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name FASB Staff Position (FSP)
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15E
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

+ References

+ Details

Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations	$ 0	$ 6,672	$ 0	$ 13,064
Fees to Vornado	1,002	1,053	1,984	2,085
Kings Plaza Regional Shopping Center [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	0	16,724	0	33,083
Total expenses	0	10,052	0	20,019
Income from discontinued operations	$ 0	6,672	$ 0	13,064
Fees to Vornado		$ 432		$ 877

- Definition

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.12)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.14)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 13
-Article 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 47
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Article 5

+ Details

Significant Tenants (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Significant Tenants (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Real Estate Properties [Line Items]
Total revenues	$ 47,302	$ 46,878	$ 96,077	$ 94,179
Bloomberg [Member] \| Customer Concentration Risk [Member]
Real Estate Properties [Line Items]
Total revenues			$ 43,322	$ 42,395
Percentage Rent Contributed By Tenant			45.00%	45.00%

Mortgages Payable (Details) - USD ($)	Jun. 30, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Mortgage payable (in US Dollars)	$ 1,058,028,000	$ 1,065,916,000
Rego Park 1 Shopping [Member] \| Mortgages [Member] \| Secured Debt [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2015-03
Interest rate	0.40%
Mortgage payable (in US Dollars)	$ 78,246,000	78,246,000
Percentage of cash mortgage collateralized	100.00%
Rego Park 2 Property [Member] \| Mortgages [Member] \| Secured Debt [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2018-11
Interest rate	2.05%
Mortgage payable (in US Dollars)	$ 270,896,000	272,245,000
Basis spread over LIBOR	1.85%
Lexington Avenue Property [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage payable (in US Dollars)	$ 320,000,000
Mortgage Loan Converted To Recourse (in US Dollars)	$ 75,000,000
Lexington Avenue Property [Member] \| Mortgages [Member] \| Secured Debt [Member] \| Office Space [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2014-02
Interest rate	5.33%
Mortgage payable (in US Dollars)	$ 320,886,000	327,425,000
Lexington Avenue Property [Member] \| Mortgages [Member] \| Secured Debt [Member] \| Retail Site [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2015-07
Interest rate	4.93%
Mortgage payable (in US Dollars)	$ 320,000,000	320,000,000
Lexington Avenue Property [Member] \| Mortgages [Member] \| Secured Debt [Member] \| Retail Site [Member] \| Maximum [Member]
Mortgage Loans on Real Estate [Line Items]
Mortgage Loan Converted To Recourse (in US Dollars)	$ 75,000,000
Paramus Property [Member] \| Mortgages [Member] \| Secured Debt [Member]
Mortgage Loans on Real Estate [Line Items]
Debt Instrument Maturity Date String	2018-10
Interest rate	2.90%
Mortgage payable (in US Dollars)	$ 68,000,000	$ 68,000,000

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Liabilities [Abstract]
Marketable securities	$ 32,635	$ 31,206
Carrying Reported Amount Fair Value Disclosure [Member]
Assets [Abstract]
Cash equivalents	318,682	289,054
Liabilities [Abstract]
Mortgages payable	1,058,028	1,065,916
Leasing commissions (included in Amounts due to Vornado)	44,481	45,803
Liabilities, Fair Value Disclosure, Total	1,102,509	1,111,719
Estimate Of Fair Value Fair Value Disclosure [Member]
Assets [Abstract]
Cash equivalents	318,682	289,054
Liabilities [Abstract]
Mortgages payable	1,101,000	1,097,000
Leasing commissions (included in Amounts due to Vornado)	44,000	46,000
Liabilities, Fair Value Disclosure, Total	1,145,000	1,143,000
Fair Value, Inputs, Level 1 [Member]
Liabilities [Abstract]
Marketable securities	32,635	31,206
Fair Value, Inputs, Level 2 [Member]
Liabilities [Abstract]
Marketable securities	0	0
Fair Value, Inputs, Level 3 [Member]
Liabilities [Abstract]
Marketable securities	$ 0	$ 0

Stock-Based Compensation (Details) - USD ($)	1 Months Ended	6 Months Ended
Stock-Based Compensation (Details) - USD ($)	May 31, 2013	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized in connection with the issuance of Deferred Stock Units		$ 394,000	$ 300,000
Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted to each grantee (in shares)	243
Grant date fair value per grant	$ 56,250
Expense recognized in connection with the issuance of Deferred Stock Units	$ 394,000

Commitments and Contingencies (Details)	6 Months Ended	12 Months Ended
Commitments and Contingencies (Details)	Jun. 30, 2013 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2001 a
Insurance [Abstract]
Mortgage payable (in US Dollars)	$ 1,058,028,000		$ 1,065,916,000
Letters Of Credit [Abstract]
Standby letters of credit, issued and outstanding	4,058,000
Lexington Avenue Property [Member]
Insurance [Abstract]
Mortgage Loan Converted To Recourse (in US Dollars)	75,000,000
Mortgage payable (in US Dollars)	320,000,000
Paramus Property [Member] \| Tenant Occupant [Member] \| Ikea [Member]
Insurance [Abstract]
Mortgage payable (in US Dollars)	$ 68,000,000
Paramus Property [Abstract]
Acres Of Land \| a				30.3
Leases Of Lessor Rental Term Range	40 years
Fixed interest rate on the debt	2.90%
Triple-net rent, annual amount	$ 700,000
Paramus Property [Member] \| Tenant Occupant [Member] \| Ikea [Member] \| Scenario, Forecast [Member]
Paramus Property [Abstract]
Property purchase option exercisable by lessee		$ 75,000,000
Purchase option exercised, proceeds from sale of land		7,000,000
Purchase option exercised, gain on sale of land		60,000,000
Purchase option not exercised, amount included in triple net rent over remainder of lease		$ 68,000,000
Loan Amortization Period		20 years
Flushing Property [Member]
Flushing Property [Abstract]
Non-refundable purchase deposit	1,875,000
Indemnification Sought by Tenant	50,000,000
General Liability [Member]
Insurance [Abstract]
Insurance Maximum Coverage Per Incident	300,000,000
All Risk Property And Rental Value [Member]
Insurance [Abstract]
Insurance Maximum Coverage Per Incident	1,700,000,000
Terrorism Coverage Including Nbcr [Member]
Insurance [Abstract]
Insurance Maximum Coverage Per Incident	1,700,000,000
NBCR [Member]
Insurance [Abstract]
Deductible	$ 275,000
Self Insured Responsibility	15.00%
Federal Government Responsibility	85.00%

Rego Park II Apartment Tower (Details) - Rego Park 2 Property [Member]	Jun. 30, 2013 USD ($) ft² property
Real Estate Properties [Line Items]
Approximate Number Of Apartment Units \| property	300
Area Of Real Estate Property (square feet) \| ft²	250,000
Estimated future funding \| $	$ 125,000,000

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Income from continuing operations	$ 13,139	$ 12,566	$ 27,301	$ 25,598
Income from discontinued operations, net of income attributable to the noncontrolling interest	0	6,326	0	12,776
Net income attributable to Alexander's	$ 13,139	$ 18,892	$ 27,301	$ 38,374
Weighted average shares outstanding - basic and diluted (in shares)	5,108,745	5,107,415	5,108,383	5,107,199
Income from continuing operations (in dollars per share)	$ 2.57	$ 2.46	$ 5.34	$ 5.01
Income from discontinued operations, net (in dollars per share)	0	1.24	0	2.50
Net income per common share (in dollars per share)	$ 2.57	$ 3.70	$ 5.34	$ 7.51

- Definition

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
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-Paragraph 38
-Subparagraph b(1)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6519514

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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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-Section 04
-Paragraph 20
-Article 9

+ Details