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Related Party Transactions Releases of Guarantees (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Anthony E. and Peter L. Malkin [Member] | Mortgages [Member]  
Related Party Transaction [Line Items]  
Release of guarantee $ 1,300,000,000esrt_RelatedPartyTransactionReleaseofGuarantee
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_MortgagesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= esrt_AnthonyE.andPeterL.MalkinMember
Anthony E. and Peter L. Malkin [Member] | Mortgages [Member] | First Stamford Place [Member]  
Related Party Transaction [Line Items]  
Number of guarantees not released 1esrt_RelatedPartyTransactionNumberofGuaranteesNotReleased
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebtFirstStamfordPlaceMember
/ us-gaap_RelatedPartyTransactionAxis
= us-gaap_MortgagesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= esrt_AnthonyE.andPeterL.MalkinMember
Mortgages [Member] | First Stamford Place [Member]  
Related Party Transaction [Line Items]  
Face amount $ 250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= esrt_FixedRateDebtFirstStamfordPlaceMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MortgagesMember