The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.12)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 9
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
-Article 7

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ 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 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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This abstract relates to equity method investments and income from equity method investments

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No definition available.

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Management, Leasing And Development Fees

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Investments in Partially Owned Entities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	$ 1,553,250		$ 1,550,422
Our share of Net (Loss) Income	(4,240)	$ (2,405)
Continuing Operations [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Our share of Net (Loss) Income	$ (4,240)	(2,743)
Alexanders Inc [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	32.40%
Equity in net income or earnings	$ 6,937	5,594
Management, leasing and development fees	1,725	2,097
Carrying amount of investments in partially owned entities	128,264		133,568
Alexanders Inc [Member] \| Continuing Operations [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Our share of Net (Loss) Income	8,662	7,691
India real estate ventures [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	48,037		48,310
India real estate ventures [Member] \| Continuing Operations [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Our share of Net (Loss) Income	$ (686)	(109)
India real estate ventures [Member] \| Minimum [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	4.10%
India real estate ventures [Member] \| Maximum [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	36.50%
Partially owned office buildings [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	$ 869,233		909,782
Partially owned office buildings [Member] \| Continuing Operations [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Our share of Net (Loss) Income	$ (14,249)	(9,296)
Urban Edge Properties [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	5.40%
Equity in net income or earnings	$ 876	0
Management fees	209	584
Carrying amount of investments in partially owned entities	26,227		25,351
Urban Edge Properties [Member] \| Continuing Operations [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Our share of Net (Loss) Income	$ 1,085	584
PREIT Associates [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	8.10%
Carrying amount of investments in partially owned entities	$ 128,068		133,375
PREIT Associates [Member] \| Continuing Operations [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Our share of Net (Loss) Income	(4,288)	0
Other equity method investments [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	353,421		$ 300,036
Other equity method investments [Member] \| Continuing Operations [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Our share of Net (Loss) Income	$ 5,236	$ (1,613)