Commitments and Contingencies (Details)	6 Months Ended
	Jun. 30, 2016 USD ($)
Loss Contingencies [Line Items]
Guarantees and master leases	$ 857,000,000
Outstanding letters of credit	38,576,000
Commitment To Fund Additional Capital To Partially Owned Entities	70,000,000
Construction Committment	721,173,000
NBCR Losses [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	2,000,000,000
Insurance Limit Aggregate Value	$ 2,000,000,000
Federal government deductible, percentage of balance of a covered loss	84.00%
Earthquake California Properties [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	$ 180,000,000
Vornado deductible, percentage of property value	5.00%
All Risk And Rental Value [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	$ 2,000,000,000
General Liability [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	300,000,000
Insurance Limit Per Property	300,000,000
Terrorism Acts [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	$ 4,000,000,000
Insurance Coverage End Date	December 2020
Insurance Limit Aggregate Value	$ 4,000,000,000
PPIC [Member] | NBCR Losses [Member]
Loss Contingencies [Line Items]
Insurance deductible	$ 2,400,000
Insurance Deductible Percentage Of Balance Of Covered Loss	16.00%