Commitments and Contingencies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Loss Contingencies [Line Items]
Guarantees and master leases	$ 811,000
Outstanding letters of credit	38,882
Commitment To Fund Additional Capital To Partially Owned Entities	66,000
Construction Committment	687,000
NBCR Losses
Loss Contingencies [Line Items]
Insurance limit per occurrence	2,000,000
Insurance limit per property in aggregate	$ 2,000,000
Insurance Coverage End Date	December 2020
Federal government deductible, percentage of balance of a covered loss	84.00%
Earthquake California Properties
Loss Contingencies [Line Items]
Insurance limit per occurrence	$ 180,000
Insurance limit per property in aggregate	$ 180,000
Vornado deductible, percentage of property value	5.00%
All Risk And Rental Value
Loss Contingencies [Line Items]
Insurance limit per occurrence	$ 2,000,000
General Liability
Loss Contingencies [Line Items]
Insurance limit per occurrence	300,000
Insurance limit per property in aggregate	300,000
Terrorism Acts
Loss Contingencies [Line Items]
Insurance limit per occurrence	4,000,000
Insurance limit per property in aggregate	4,000,000
PPIC | NBCR Losses
Loss Contingencies [Line Items]
Insurance deductible	$ 2,400
Insurance Deductible Percentage Of Balance Of Covered Loss	16.00%