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Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 07, 2013
Deferred Costs [Line Items]          
Amortization of deferred leasing and acquired deferred leasing costs   $ 25,400 $ 21,900 $ 10,600  
Amortization of acquired above and below-market leases, net $ 1,911 19,353 14,095 1,900  
Goodwill   491,479 491,479    
Empire State Building Observatory Operations [Member]          
Deferred Costs [Line Items]          
Goodwill         $ 227,500
Empire State Building [Member]          
Deferred Costs [Line Items]          
Goodwill         250,800
501 Seventh Avenue [Member]          
Deferred Costs [Line Items]          
Goodwill         $ 13,200
Lease Agreements [Member]          
Deferred Costs [Line Items]          
Amortization expense related to acquired lease intangibles   $ 37,700 $ 33,700 $ 5,300  
Ground Lease [Member]          
Deferred Costs [Line Items]          
Weighted-average amortization period   26 years      
Leases and Deferred Leasing Costs [Member]          
Deferred Costs [Line Items]          
Weighted-average amortization period   4 years 10 months 24 days      
Acquired above-market leases [Member]          
Deferred Costs [Line Items]          
Weighted-average amortization period   4 years      
Below Market Lease [Member]          
Deferred Costs [Line Items]          
Weighted-average amortization period   4 years 6 months