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Equity (Details) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 30, 2013
Dec. 31, 2013
Oct. 06, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 31, 2014
Oct. 08, 2013
Sep. 02, 2014
Shares and Units [Abstract]                          
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest           $ 75,245,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic   $ 26,667,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic          
Change from net income attributable to common stockholders and transfers from noncontrolling interests           75,245,000esrt_NetIncomeLossAvailabletoCommonStockholdersAdjustedforConversionofConvertibleUnitsandTransfersfromNoncontrollingInterest   67,278,000esrt_NetIncomeLossAvailabletoCommonStockholdersAdjustedforConversionofConvertibleUnitsandTransfersfromNoncontrollingInterest          
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 $ 16.62esrt_PrivatePerpetualPreferredUnitsLiquidationPreferencePerShare        
Full quarter dividend, per share         $ 0.085us-gaap_CommonStockDividendsPerShareDeclared     $ 0.34us-gaap_CommonStockDividendsPerShareDeclared $ 0.0795us-gaap_CommonStockDividendsPerShareDeclared        
Dividends and Distributions [Abstract]                          
Partial dividend paid, per common share $ 0.0850us-gaap_CommonStockDividendsPerShareCashPaid $ 0.0850us-gaap_CommonStockDividendsPerShareCashPaid $ 0.0850us-gaap_CommonStockDividendsPerShareCashPaid $ 0.0850us-gaap_CommonStockDividendsPerShareCashPaid $ 0.0795us-gaap_CommonStockDividendsPerShareCashPaid                
Amount per Preferred Unit           $ 0.1500esrt_PrivatePerpetualPreferredUnitDividendsPerUnitDeclared     $ 0.1500esrt_PrivatePerpetualPreferredUnitDividendsPerUnitDeclared       $ 0.1500esrt_PrivatePerpetualPreferredUnitDividendsPerUnitDeclared
Payments of Ordinary Dividends, Common Stock               33,600,000us-gaap_PaymentsOfDividendsCommonStock 7,600,000us-gaap_PaymentsOfDividendsCommonStock        
Distributions paid to OP unitholders               53,600,000us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 11,900,000us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders        
Payments of Private Perpetual Preferred Units Distributions           0esrt_PaymentsofPrivatePerpetualPreferredUnitsDistributions 0esrt_PaymentsofPrivatePerpetualPreferredUnitsDistributions 476,000esrt_PaymentsofPrivatePerpetualPreferredUnitsDistributions   0esrt_PaymentsofPrivatePerpetualPreferredUnitsDistributions      
Dividends paid, percent taxable as ordinary dividends               100.00%esrt_CommonStockDividendsPerSharePercentTaxableasOrdinaryDividends          
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		    
Full quarter dividend, per share                     $ 0.60us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= esrt_PrivatePerpetualPreferredUnitsMember		    
Private Perpetual Preferred Unit, Offering Expense                     1,400,000esrt_PrivatePerpetualPreferredUnitOfferingExpense
/ us-gaap_StatementClassOfStockAxis
= esrt_PrivatePerpetualPreferredUnitsMember		    
Executive Officer [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                          
Class of Stock [Line Items]                          
Award vesting period (in years)                       3 years  
Additional Paid-in Capital [Member]                          
Shares and Units [Abstract]                          
Increase in additional paid-in capital for the conversion of OP units into common stock           $ 0us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   $ 40,611,000us-gaap_StockIssuedDuringPeriodValueConversionOfUnits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember