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Related Party Transactions Registration Rights (Details) (Investor [Member], USD $) | 12 Months Ended
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Dec. 31, 2014 offering
Related Party Transaction [Line Items] |
Minimum market value of registrable shares | $ 150,000,000 esrt_RelatedPartyTransactionMinimumMarketValueofRegistrableShares
Maximum number of underwritten offerings obligated to effect | 4 esrt_RelatedPartyTransactionNumberofUnderwrittenOfferingsObligatedtoEffectMaximum
Share value cut back threshold | 25,000,000 esrt_RelatedPartyTransactionShareValueCutBackThreshold
Maximum reimbursement of liabilities arising under the Securities Act | 25,000 esrt_RelatedPartyTransactionReimbursementofLiabilitiesArisingUndertheSecuritiesActMaximum
Reimbursement of liabilities arising under the Securities Act | $ (500,000.0)esrt_RelatedPartyTransactionReimbursementofLiabilitiesArisingUndertheSecuritiesAct
ESRT [Member] |
Related Party Transaction [Line Items] |
Maximum number of underwritten offerings obligated to effect in a 12 month period | 2 esrt_RelatedPartyTransactionNumberofUnderwrittenOfferingsObligatedtoEffectinTwelveMonthPeriodMaximum / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_InvestorMember
Maximum number of underwritten offerings obligated to effect period | 12 months

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- Definition Related Party Transaction, Minimum Market Value of Registrable Shares + References No definition available. + Details
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Namespace Prefix: | esrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Related Party Transaction, Number of Underwritten Offerings Obligated to Effect in Twelve Month Period, Maximum + References No definition available. + Details
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- Definition Related Party Transaction, Number of Underwritten Offerings Obligated to Effect, Maximum + References No definition available. + Details
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- Definition Related Party Transaction, Number of Underwritten Offerings Obligated to Effect, Maximum, Period + References No definition available. + Details
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- Definition Related Party Transaction, Reimbursement of Liabilities Arising Under the Securities Act + References No definition available. + Details
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Namespace Prefix: | esrt_
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Period Type: | duration

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- Definition Related Party Transaction, Reimbursement of Liabilities Arising Under the Securities Act, Maximum + References No definition available. + Details
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Namespace Prefix: | esrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Related Party Transaction, Share Value Cut Back Threshold + 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration