Fee and Other Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fee And Other Income [Line Items]
BMS cleaning fees	$ 82,113	$ 85,658	$ 66,505
Lease termination fees	27,233	16,362	32,630
Management and leasing fees	16,831	19,905	23,073
Other income	38,528	33,281	33,363
Fee and other income	164,705	$ 155,206	155,571
1290 Avenue of the Americas [Member]
Fee And Other Income [Line Items]
Lease termination fees			19,500
Write Off Of Straight Lining Of Rent			$ 1,529
Equity method ownership percentage			70.00%
Cuyahoga County [Member]
Fee And Other Income [Line Items]
Lease termination fees			$ 3,000
20 Broad Street [Member]
Fee And Other Income [Line Items]
Lease termination income	$ 15,000
Vornado Realty Trust [Member] | 1290 Avenue of the Americas [Member]
Fee And Other Income [Line Items]
Lease termination fees			$ 12,121