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Equity - Incentive and Share-based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended
Oct. 08, 2013
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Apr. 30, 2014
Oct. 28, 2014
Jan. 31, 2014
vesting_installment
Apr. 30, 2014
Jun. 30, 2014
tranche
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Expected volatility rate look-back period (in years) 6 years                
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Unvested beginning balance, per share     $ 13.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue       $ 13.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 13.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue  
Vested, Weighted Average Grant Price, per share     $ 13.01us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue $ 13.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue          
Granted, Weighted Average Grant Price, per share     $ 15.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 13.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue          
Forfeited, Weighted Average Grant Price, per share     $ 13.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue $ 13.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue          
Unvested ending balance, per share   $ 13.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 13.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue $ 13.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue          
Age of grantee at which LTIP unit and restricted stock awards immediately vest   60 years              
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest   10 years              
2013 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares authorized under the plan     12,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= esrt_A2013PlanMember
           
Number of shares that remain available for future issuance     10,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= esrt_A2013PlanMember
           
Long-Term Incentive Plan Unit and Restricted Stock [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period     $ 5.40esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
$ 11.70esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
         
Expected term     3 years 3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate     2.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
2.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
         
Risk-free interest rate     0.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
0.66%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
         
Expected price volatility     26.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
28.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
         
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted, Weighted Average Grant Price, per share     $ 10.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
$ 10.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitandRestrictedStockMember
         
Long-Term Incentive Plan Unit [Member]                  
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Fair value vested in period     3.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitsandRestrictedStockMember
           
Time Based Long-Tern Incentive Plan Unit [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period 3.90esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
               
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares) 193,059us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
               
Time Based Long-Tern Incentive Plan Unit [Member] | 2013 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period         0.70esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_PlanNameAxis
= esrt_A2013PlanMember
       
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares)         48,923us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_PlanNameAxis
= esrt_A2013PlanMember
       
Performance Based Long-Term Incentive Plan Unit [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period 0.60esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
               
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares) 64,352us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
               
Restricted Stock [Member]                  
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Unvested beginning balance (in shares)     144,371us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
      144,371us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
144,371us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Vested (in shares)     (37,458)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
(12,607)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
         
Granted (in shares)     17,262us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
158,852us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
         
Forfeited (in shares)     (21,879)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
(1,874)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
         
Unvested ending balance (in shares)   144,371us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
102,296us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
144,371us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
         
Performance Restricted Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period           0.01esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_PerformanceRestrictedSharesMember
     
Award vesting period (in years)           2 years      
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares) 39,706us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_PerformanceRestrictedSharesMember
        1,571us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_PerformanceRestrictedSharesMember
     
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest           3 years      
Time Restricted Shares [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period           0.02esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_TimeRestrictedSharesMember
     
Award vesting period (in years)           4 years      
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares) 119,146us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeRestrictedSharesMember
        1,571us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeRestrictedSharesMember
     
Long-Term Incentive Plan Unit [Member]                  
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Unvested beginning balance (in shares)     913,561us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
      913,561us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
913,561us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
 
Vested (in shares)     (191,043)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
         
Granted (in shares)     488,613us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
913,561us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
         
Forfeited (in shares)     (16,471)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
         
Unvested ending balance (in shares)   913,561us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
1,194,660us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
913,561us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= esrt_LongTermIncentivePlanUnitMember
         
Share-based Compensation Award, Tranche One [Member] | Time Based Long-Tern Incentive Plan Unit [Member] | 2013 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         30.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_PlanNameAxis
= esrt_A2013PlanMember
/ us-gaap_VestingAxis
= esrt_SharebasedCompensationAwardTrancheOneMember
       
Award vesting period (in years)         3 years        
Awards that Meet Age and Service Requirements for Vesting [Member]                  
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Noncash share-based compensation expense recognized   2.3us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_VestingAxis
= esrt_AwardsthatMeetAgeandServiceRequirementsforVestingMember
0.2us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_VestingAxis
= esrt_AwardsthatMeetAgeandServiceRequirementsforVestingMember
           
Unrecognized compensation expense     0.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_VestingAxis
= esrt_AwardsthatMeetAgeandServiceRequirementsforVestingMember
           
Unrecognized compensation expense, period for recognition (in years)     1 year 9 months 18 days            
Awards that Do Not Meet Age and Service Requirements for Vesting [Member]                  
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Noncash share-based compensation expense recognized   0.7us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_VestingAxis
= esrt_AwardsthatDoNotMeetAgeandServiceRequirementsforVestingMember
3.5us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_VestingAxis
= esrt_AwardsthatDoNotMeetAgeandServiceRequirementsforVestingMember
           
Unrecognized compensation expense     9.6us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_VestingAxis
= esrt_AwardsthatDoNotMeetAgeandServiceRequirementsforVestingMember
           
Unrecognized compensation expense, period for recognition (in years)     2 years 9 months 18 days            
Share-based Compensation Award, Tranche Two [Member] | Time Based Long-Tern Incentive Plan Unit [Member] | 2013 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         30.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_PlanNameAxis
= esrt_A2013PlanMember
/ us-gaap_VestingAxis
= esrt_SharebasedCompensationAwardTrancheTwoMember
       
Award vesting period (in years)         4 years        
Share-based Compensation Award, Tranche Three [Member] | Time Based Long-Tern Incentive Plan Unit [Member] | 2013 Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage         40.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_PlanNameAxis
= esrt_A2013PlanMember
/ us-gaap_VestingAxis
= esrt_SharebasedCompensationAwardTrancheThreeMember
       
Award vesting period (in years)         5 years        
Executive Officer [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period 5.40esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
          2.50esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Number of Vesting Installments 4esrt_NumberofVestingInstallments
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
          4esrt_NumberofVestingInstallments
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Award vesting period (in years) 3 years                
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares) 440,192us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
          180,260us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Executive Officer [Member] | Performance Based Long-Term Incentive Plan Unit [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period 0.90esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
          0.90esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Number of Vesting Installments 2esrt_NumberofVestingInstallments
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
          2esrt_NumberofVestingInstallments
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Award vesting period (in years) 3 years           3 years    
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares) 146,730us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
          180,263us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
   
Employee [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period               0.40esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= esrt_EmployeeMember
 
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares)               23,487us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= esrt_EmployeeMember
 
Employee [Member] | Performance Based Long-Term Incentive Plan Unit [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period               0.20esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= esrt_EmployeeMember
 
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares)               23,484us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_PerformanceBasedLongTermIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= esrt_EmployeeMember
 
Employee [Member] | Performance Restricted Shares [Member]                  
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares)               7,059us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_PerformanceRestrictedSharesMember
/ us-gaap_TitleOfIndividualAxis
= esrt_EmployeeMember
 
Employee [Member] | Time Restricted Shares [Member]                  
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares)               7,061us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeRestrictedSharesMember
/ us-gaap_TitleOfIndividualAxis
= esrt_EmployeeMember
 
Director [Member] | Time Based Long-Tern Incentive Plan Unit [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of share-based awards granted in period 0.90esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
              $ 0.50esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Number of Vesting Installments                 3esrt_NumberofVestingInstallments
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Restricted Stock and LTIP Unit Activity [Roll Forward]                  
Granted (in shares) 69,228us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
              32,196us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= esrt_TimeBasedLongTernIncentivePlanUnitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember