Partners' Capital (Details) (Redeemable Preferred Stock [Member], USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended
	Jul. 11, 2012 Series K Preferred Stock [Member] Public Offering [Member]	Aug. 16, 2012 Series E Preferred Stock [Member]
Preferred Stock, Additional Disclosure [Abstract]
Preferred shares of beneficial interest: issued shares	12,000,000
Preferred Stock, Par or Stated Value Per Share	$ 25.00
Preferred Stock, Redemption Price Per Share	$ 25.00
Proceeds from Issuance of Redeemable Preferred Stock	$ 291,144
Preferred Stock, Redemption Amount		$ 75,000
Preferred Stock Issued Additional Disclosure	Vornado retained aggregate net proceeds of $291,144,000, after underwriters’ discounts and issuance costs and contributed the net proceeds to us in exchange for 12,000,000 Series K Preferred Units (with economic terms that mirror those of Series K Preferred Shares).
Preferred Stock Duration From Issuance To Earliest Redemption Date	5 years
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock, Dividend Rate, Percentage	5.70%	7.00%