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Commitments and Contingencies Litigation (Details) (USD $)
0 Months Ended
Oct. 14, 2014
participant
Sep. 04, 2013
participant
May 17, 2013
participant
Sep. 28, 2012
llc
Jan. 28, 2013
participant
Mar. 14, 2014
investor
Jun. 20, 2013
investor
Dec. 24, 2013
claim
Mar. 31, 2012
claim
Loss Contingencies [Line Items]                  
Number of additional investors who apposed the settlement             1esrt_NumberofAdditionalInvestorswhoApposedtheSettlement    
Number of investors who had filed a notice of appeal           1esrt_NumberofInvestorswhohadFiledaNoticeofAppeal      
Pending Litigation [Member] | New York State Supreme Court, New York County [Member]                  
Loss Contingencies [Line Items]                  
Number of claims               4us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
 
Predecessor [Member] | New York State Supreme Court, New York County [Member]                  
Loss Contingencies [Line Items]                  
Damages awarded       $ 55,000,000us-gaap_LossContingencyDamagesAwardedValue
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Percent of damages awarded required to be in cash       80.00%esrt_LossContingencyDamagesAwardedPercentinCashMinimum
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Maximum percent of freely-tradable common stock or partnership units       20.00%esrt_LossContingencyDamagesAwardedFreelytradableCommonStockorOperatingUnitsMaximum
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Number of LLC's       3esrt_LossContingencyNumberofLLCs
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Maximum difference between exchange value and prospectus statement       10.00%esrt_LossContingencyMaximumDifferenceBetweenExchangeValueandProspectusStatement
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Loss Contingency, Proceeds from Issuance of Common Stock, Threshold Amount, Consolidation Considerations       600,000,000esrt_LossContingencyProceedsfromIssuanceofCommonStockThresholdAmountConsolidationConsiderations
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
         
Number of plaintiffs opting out of settlement 12esrt_LossContingencyNumberofPlaintiffsOptingOutofSettlement
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
2esrt_LossContingencyNumberofPlaintiffsOptingOutofSettlement
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
12esrt_LossContingencyNumberofPlaintiffsOptingOutofSettlement
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
           
Attorney fees sought     15,000,000esrt_LossContingencyDamagesAwardedAttorneyFeesSoughtValue
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
           
Attorney expenses sought     295,895esrt_LossContingencyDamagesAwardedAttorneyExpensesSoughtValue
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
           
Attorney fees awarded     11,590,000esrt_LossContingencyDamagesAwardedAttorneyFeesAwardedValue
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
           
Attorney expenses awarded     $ 265,282esrt_LossContingencyDamagesAwardedAttorneyExpensesAwardedValue
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
           
Predecessor [Member] | Pending Litigation [Member]                  
Loss Contingencies [Line Items]                  
Number of plaintiffs         6us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
       
Predecessor [Member] | Pending Litigation [Member] | New York State Supreme Court, New York County [Member]                  
Loss Contingencies [Line Items]                  
Number of claims                 5us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Number of plaintiffs 4,500us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  4,500us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  6us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationCaseAxis
= esrt_NewYorkStateSupremeCourtNewYorkCountyMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember