Commitments and Contingencies (Details) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2014		Mar. 31, 2014 388 and 390 Greenwich Street
Business Acquisition [Line Items]
Business Combination, Contracted Consideration			$ 1,600,000,000
Initial term of non cancellable operating leases, minimum	1 year
Capital lease (1)
2014 (9 months)	1,719,000	[1]
2015	2,363,000	[1]
2016	2,531,000	[1]
2017	2,652,000	[1]
2018	2,652,000	[1]
Thereafter	353,826,000	[1]
Total minimum lease payments	365,743,000	[1]
Less amount representing interest	(317,844,000)	[1]
Present value of net minimum lease payments	47,899,000	[1]
Non-cancellable operating leases
2014 (9 months)	26,516,000	[1]
2015	35,511,000	[1]
2016	35,943,000	[1]
2017	36,176,000	[1]
2018	36,176,000	[1]
Thereafter	1,409,808,000	[1]
Total minimum lease payments	$ 1,580,130,000	[1]

[1] Amounts include commitments related to the asset that is held for sale at March 31, 2014.