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Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 06, 2013
Deferred Costs [Line Items]          
Amortization of deferred leasing costs   $ 9,700,000us-gaap_AmortizationOfDeferredLeasingFees $ 10,600,000us-gaap_AmortizationOfDeferredLeasingFees $ 7,400,000us-gaap_AmortizationOfDeferredLeasingFees  
Amortization of deferred finance costs and debt premiums and discount   7,600,000us-gaap_AmortizationOfFinancingCosts 12,700,000us-gaap_AmortizationOfFinancingCosts 4,900,000us-gaap_AmortizationOfFinancingCosts  
Amortization of acquired above and below-market leases, net (1,911,000)us-gaap_AmortizationOfAboveAndBelowMarketLeases (14,095,000)us-gaap_AmortizationOfAboveAndBelowMarketLeases (1,903,000)us-gaap_AmortizationOfAboveAndBelowMarketLeases 0us-gaap_AmortizationOfAboveAndBelowMarketLeases  
Goodwill 491,479,000us-gaap_Goodwill 491,479,000us-gaap_Goodwill 491,479,000us-gaap_Goodwill    
Empire State Building Observatory Operations [Member]          
Deferred Costs [Line Items]          
Goodwill         227,500,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= esrt_EmpireStateBuildingObservatoryOperationsMember
Empire State Building, L.L.C. [Member]          
Deferred Costs [Line Items]          
Goodwill         250,800,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= esrt_EmpireStateBuildingL.L.C.Member
501 Seventh Avenue Associates [Member]          
Deferred Costs [Line Items]          
Goodwill         13,200,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= esrt_Location501SeventhAvenueAssociatesMember
Lease Agreements [Member]          
Deferred Costs [Line Items]          
Amortization expense related to acquired lease intangibles   $ 33,700,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeaseAgreementsMember		 $ 5,300,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeaseAgreementsMember		 $ 0us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LeaseAgreementsMember		  
Ground Lease [Member]          
Deferred Costs [Line Items]          
Weighted average useful life   26 years 4 months 30 days      
Leases and Deferred Leasing Costs [Member]          
Deferred Costs [Line Items]          
Weighted average useful life   4 years 10 months 30 days      
Acquired above-market leases [Member]          
Deferred Costs [Line Items]          
Weighted average useful life   4 years 2 months 30 days      
Below Market Lease [Member]          
Deferred Costs [Line Items]          
Weighted average useful life   4 years 4 months 30 days