Fee and Other Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fee And Other Income [Line Items]
BMS cleaning fees	$ 66,505	$ 67,584	$ 61,754
Signage Revenue	32,866	20,892	19,823
Management and leasing fees	24,637	21,849	21,783
Lease termination fees	92,497	2,361	16,334
Other income	34,727	31,667	29,937
Fee and other income	251,232	144,353	149,631
Loss Contingencies [Line Items]
Gain related to litigation settlement	59,599
Stop & Shop [Member]
Loss Contingencies [Line Items]
Complaint Regarding Rent Allocation	6,000
Gain related to litigation settlement	59,599
New York 1290 Avenue Of 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
Vornado Realty Trust [Member]
Fee And Other Income [Line Items]
Lease termination fees	$ 12,121