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Commitments and Contingencies - Legal Proceedings (Details) | Oct. 14, 2014 participant
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New York State Supreme Court, New York County |
Loss Contingencies [Line Items] |
Number of plaintiffs opting out of settlement | 12

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- Definition Loss Contingency, Number of Plaintiffs Opting Out of Settlement + References No definition available. + Details
Name: | esrt_LossContingencyNumberofPlaintiffsOptingOutofSettlement
Namespace Prefix: | esrt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LitigationCaseAxis=esrt_NewYorkStateSupremeCourtNewYorkCountyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |