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Related Party Transactions Tax Protection Agreement (Details) (Malkin Group [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 property
Related Party Transaction [Line Items] |
Number of properties protected | 4 esrt_RelatedPartyTransactionNumberofPropertiesProtected
Aggregate number of operating partnership units and common stock threshold during tax protection period | 50.00%esrt_RelatedPartyTransactionAggregateNumberofOperatingPartnershipUnitsandCommonStockThresholdDuringTaxProtectionPeriod
Bottom dollar guarantee of aggregate indebtedness during tax protection period | $ 160.0 esrt_RelatedPartyTransactionBottomDollarGuaranteeofAggregateIndebtednessDuringtaxProtectionPeriod
Other Protected Property [Member] |
Related Party Transaction [Line Items] |
Number of properties protected | 3 esrt_RelatedPartyTransactionNumberofPropertiesProtected / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = esrt_OtherProtectedPropertyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_MalkinGroupMember

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- Definition Related Party Transaction, Aggregate Number of Operating Partnership Units and Common Stock Threshold During Tax Protection Period + References No definition available. + Details
Name: | esrt_RelatedPartyTransactionAggregateNumberofOperatingPartnershipUnitsandCommonStockThresholdDuringTaxProtectionPeriod
Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Related Party Transaction, Bottom Dollar Guarantee of Aggregate Indebtedness During tax Protection Period + References No definition available. + Details
Name: | esrt_RelatedPartyTransactionBottomDollarGuaranteeofAggregateIndebtednessDuringtaxProtectionPeriod
Namespace Prefix: | esrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Related Party Transaction, Number of Properties Protected + References No definition available. + Details
Name: | esrt_RelatedPartyTransactionNumberofPropertiesProtected
Namespace Prefix: | esrt_
Data Type: | xbrli:integerItemType
Balance Type: | na
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