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Related Party Transactions Formation Transactions (Details) (USD $)
0 Months Ended
Oct. 08, 2013
Oct. 06, 2013
Oct. 07, 2013
Related Party Transaction [Line Items]      
Proceeds from Issuance Initial Public Offering, Net of Costs of Issuance $ 2,800,000,000esrt_ProceedsfromIssuanceInitialPublicOfferingNetofCostsofIssuance    
Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Partners' Capital Account, Units, Sale of Units 37,748,249us-gaap_PartnersCapitalAccountUnitsSaleOfUnits
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Chief Executive Officer [Member]      
Related Party Transaction [Line Items]      
Partners' Capital Account, Units, Sale of Units 28,718,631us-gaap_PartnersCapitalAccountUnitsSaleOfUnits
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember
   
Board of Directors Chairman [Member]      
Related Party Transaction [Line Items]      
Partners' Capital Account, Units, Sale of Units 6,027,867us-gaap_PartnersCapitalAccountUnitsSaleOfUnits
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
   
Predecessor [Member] | Investor [Member]      
Related Party Transaction [Line Items]      
Payments of Capital Distribution 180,000,000us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_InvestorMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Payments of Capital Distribution $ 38,900,000us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Common Class A [Member]      
Related Party Transaction [Line Items]      
Issuance of Common Stock (in shares)   82,200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Class A [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Issuance of Common Stock (in shares) 396,025us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Common Class A [Member] | Chief Executive Officer [Member]      
Related Party Transaction [Line Items]      
Issuance of Common Stock (in shares) 210,289us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Common Class A [Member] | Board of Directors Chairman [Member]      
Related Party Transaction [Line Items]      
Issuance of Common Stock (in shares) 2,772us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Common Class B [Member] | Affiliated Entity [Member]      
Related Party Transaction [Line Items]      
Issuance of Common Stock (in shares) 747,435us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
   
Related Party, Ownership Interest, Diluted Basis, Percent     15.80%esrt_RelatedPartyOwnershipInterestDilutedBasisPercent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Class B [Member] | Chief Executive Officer [Member]      
Related Party Transaction [Line Items]      
Issuance of Common Stock (in shares) 586,095us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
   
Related Party, Ownership Interest, Diluted Basis, Percent     12.00%esrt_RelatedPartyOwnershipInterestDilutedBasisPercent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Class B [Member] | Board of Directors Chairman [Member]      
Related Party Transaction [Line Items]      
Issuance of Common Stock (in shares) 100,084us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
   
Related Party, Ownership Interest, Diluted Basis, Percent     2.50%esrt_RelatedPartyOwnershipInterestDilutedBasisPercent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BoardOfDirectorsChairmanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Senior Management [Member]      
Related Party Transaction [Line Items]      
Partners' Capital Account, Units, Sale of Units 1,167,336us-gaap_PartnersCapitalAccountUnitsSaleOfUnits
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
   
Senior Management [Member] | Common Class B [Member]      
Related Party Transaction [Line Items]      
Issuance of Common Stock (in shares) 2,407us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
   
Related Party, Ownership Interest, Diluted Basis, Percent     0.50%esrt_RelatedPartyOwnershipInterestDilutedBasisPercent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember