Fee and Other Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fee And Other Income [Line Items]
BMS cleaning fees	$ 15,898	$ 16,945	$ 49,071	$ 49,437
Signage Revenue	8,738	4,783	23,566	14,252
Management and leasing fees	7,982	7,234	19,675	16,534
Lease termination fees	20,432	282	87,587	1,172
Other income	8,108	10,381	26,431	24,494
Fee and other income	61,158	39,625	206,330	105,889
Management fee income from Interstate Properties	134	198	467	588
Stop & Shop [Member]
Loss Contingencies [Line Items]
Complaint regarding rent allocation	6,000		6,000
Gain related to litigation settlement			59,599
New York 1290 Avenue Of Americas [Member]
Fee And Other Income [Line Items]
Write Off Of Straight Lining Of Rent	1,529		1,529
Parent Company Includig Minority Partner [Member]
Fee And Other Income [Line Items]
Lease termination fees	19,500
Vornado Realty Trust [Member]
Fee And Other Income [Line Items]
Lease termination fees	$ 12,121