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Capital (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Aug. 31, 2014
Sep. 02, 2014
Shares and Units [Abstract]                  
OP units outstanding (shares) 267,100,000us-gaap_UnitsOfPartnershipInterestAmount         267,100,000us-gaap_UnitsOfPartnershipInterestAmount      
OP units owned by the Company (shares) 107,200,000us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding         107,200,000us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding      
OP units owned by the Company, percent           40.10%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest      
OP units not owned by the Company (shares) 159,900,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding         159,900,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding      
OP units not owned by the Company, percent           59.90%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest      
Private Perpetual Preferred Units, Liquidation Preference Per Share $ 16.62esrt_PrivatePerpetualPreferredUnitsLiquidationPreferencePerShare         $ 16.62esrt_PrivatePerpetualPreferredUnitsLiquidationPreferencePerShare $ 16.62esrt_PrivatePerpetualPreferredUnitsLiquidationPreferencePerShare    
Dividend declared         $ 0.085us-gaap_CommonStockDividendsPerShareDeclared        
Dividends and Distributions [Abstract]                  
Common Stock, Dividends, Per Share, Cash Paid $ 0.0850us-gaap_CommonStockDividendsPerShareCashPaid $ 0.0850us-gaap_CommonStockDividendsPerShareCashPaid $ 0.0850us-gaap_CommonStockDividendsPerShareCashPaid $ 0.0850us-gaap_CommonStockDividendsPerShareCashPaid $ 0.0795us-gaap_CommonStockDividendsPerShareCashPaid        
Private Perpetual Preferred Unit, Dividends, Per Unit, Declared             $ 0.1500esrt_PrivatePerpetualPreferredUnitDividendsPerUnitDeclared   $ 0.1500esrt_PrivatePerpetualPreferredUnitDividendsPerUnitDeclared
Distributions paid to OP unit holders           $ 87.7us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders $ 19.5us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders    
Private Perpetual Preferred Units [Member]                  
Shares and Units [Abstract]                  
Private Perpetual Preferred Units Issued During Period, Units, New Issues               1,560,360esrt_PrivatePerpetualPreferredUnitsIssuedDuringPeriodUnitsNewIssues
/ us-gaap_StatementClassOfStockAxis
= esrt_PrivatePerpetualPreferredUnitsMember		  
Private Perpetual Preferred Units, Liquidation Preference Per Share               $ 16.62esrt_PrivatePerpetualPreferredUnitsLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= esrt_PrivatePerpetualPreferredUnitsMember		  
Dividend declared               $ 0.60us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= esrt_PrivatePerpetualPreferredUnitsMember		  
Private Perpetual Preferred Unit, Offering Expense               $ 1.4esrt_PrivatePerpetualPreferredUnitOfferingExpense
/ us-gaap_StatementClassOfStockAxis
= esrt_PrivatePerpetualPreferredUnitsMember