Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Investments in Partially Owned Entities - Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Pro Rata Share Debt Of Partially Owned Entities	$ 4,432,078		$ 4,190,428
Toys R Us [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	32.50%
Maturity, Range, Start	2016
Maturity, Range, End	2021
Interest Rate, End of Period (in percentage)	7.35%
Equity Method Investment Debt Of Partially Owned Entities	$ 5,619,710		5,748,350
Partially owned office buildings [Member]
Schedule Of Equity Method Investments [Line Items]
Maturity, Range, Start	2016
Maturity, Range, End	2023
Interest Rate, End of Period (in percentage)	5.57%
Equity Method Investment Debt Of Partially Owned Entities	$ 3,771,255		3,691,274
PREIT Associates [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	8.10%	8.10%
Maturity, Range, Start	2016
Maturity, Range, End	2025
Interest Rate, End of Period (in percentage)	4.04%
Equity Method Investment Debt Of Partially Owned Entities	$ 1,852,270		0
Urban Edge Properties [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	5.40%
Maturity, Range, Start	2018
Maturity, Range, End	2034
Interest Rate, End of Period (in percentage)	4.15%
Equity Method Investment Debt Of Partially Owned Entities	$ 1,246,155		0
Alexanders Inc [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	32.40%
Maturity, Range, Start	2016
Maturity, Range, End	2022
Interest Rate, End of Period (in percentage)	1.69%
Equity Method Investment Debt Of Partially Owned Entities	$ 1,053,262		1,032,780
India real estate ventures [Member] \| Tcg Urban Infrastructure Holdings [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	25.00%
Maturity, Range, Start	2016
Maturity, Range, End	2026
Interest Rate, End of Period (in percentage)	12.06%
Equity Method Investment Debt Of Partially Owned Entities	$ 185,607		183,541
Other equity method investments [Member]
Schedule Of Equity Method Investments [Line Items]
Maturity, Range, Start	2016
Maturity, Range, End	2023
Interest Rate, End of Period (in percentage)	4.27%
Equity Method Investment Debt Of Partially Owned Entities	$ 1,316,641		$ 1,314,077