Commitments and Contingencies (Details) - USD ($)		12 Months Ended
	Jan. 02, 2017	Dec. 31, 2016
Other Commitments
Guarantees and master leases		$ 737,000,000
Outstanding letters of credit		19,847,000
Commitment To Fund Additional Capital To Partially Owned Entities		173,000,000
Constuction commitment		653,940,000
General Liability
Insurance
Insurance maximum coverage limit per property		300,000,000
Insurance maximum coverage limit per ocurrence		300,000,000
Terrorism Acts
Insurance
Insurance maximum coverage limit per ocurrence		4,000,000,000
Insurance maximum coverage limit in aggregate		$ 4,000,000,000
Insurance Coverage End Date		December 2020
NBCR Acts
Insurance
Insurance maximum coverage limit per ocurrence		$ 2,000,000,000
Insurance maximum coverage limit in aggregate		$ 2,000,000,000
Insurance Coverage End Date		December 2020
Earthquake California Properties
Insurance
Insurance maximum coverage limit per ocurrence		$ 180,000,000
Insurance maximum coverage limit in aggregate		$ 180,000,000
Vornado deductible, percentage of property value		5.00%
All Risk And Rental Value
Insurance
Insurance maximum coverage limit per ocurrence		$ 2,000,000,000
PPIC | NBCR Acts
Insurance
Insurance deductible		$ 1,622,000
Insurance Deductible Percentage Of Balance Of Covered Loss		16.00%
PPIC | NBCR Acts | Subsequent Event
Insurance
Insurance deductible	$ 1,976,000
Insurance Deductible Percentage Of Balance Of Covered Loss	17.00%