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Related Party Transactions Repayment of Loans to Property Owning Entities (Details) (500 Mamaroneck Avenue [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended
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Oct. 08, 2013
Investor [Member] |
Related Party Transaction [Line Items] |
Repayment of notes from related parties | $ 3.6 us-gaap_RepaymentOfNotesReceivableFromRelatedParties / us-gaap_DebtInstrumentAxis = esrt_FixedRateDebt500MamaroneckAvenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_InvestorMember
Anthony E. and Peter L. Malkin [Member] |
Related Party Transaction [Line Items] |
Repayment of notes from related parties | 1.2 us-gaap_RepaymentOfNotesReceivableFromRelatedParties / us-gaap_DebtInstrumentAxis = esrt_FixedRateDebt500MamaroneckAvenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_AnthonyE.andPeterL.MalkinMember
Anthony E. and Peter L. Malkin Interests Held [Member] |
Related Party Transaction [Line Items] |
Notes payable to related party assumed | $ 3.8 esrt_NotesAssumedRelatedParties / us-gaap_DebtInstrumentAxis = esrt_FixedRateDebt500MamaroneckAvenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_AnthonyE.andPeterL.MalkinInterestsHeldMember

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- Definition Notes Assumed, Related Parties + References No definition available. + Details
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Namespace Prefix: | esrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow from a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
Name: | us-gaap_RepaymentOfNotesReceivableFromRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration