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Deferred Costs, Acquired Lease Intangibles and Goodwill - Acquired Leases (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Acquired below-market ground lease, Gross Amount | $ 396,916 us-gaap_GroundLeasesGross | $ 62,738 us-gaap_GroundLeasesGross
Acquired below-market ground lease, Accumulated Amortization | (5,029)us-gaap_GroundLeasesAccumulatedAmortization | (426)us-gaap_GroundLeasesAccumulatedAmortization
Acquired below-market leases, Gross Amount | (169,805)us-gaap_BelowMarketLeaseGross | (134,651)us-gaap_BelowMarketLeaseGross
Acquired below-market leases, Accumulated Amortization | 30,946 us-gaap_BelowMarketLeaseAccumulatedAmortization | 4,769 us-gaap_BelowMarketLeaseAccumulatedAmortization
Acquired in-place lease value and deferred leasing costs [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | 304,916 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_AcquiredInPlaceLeaseValueAndDeferredLeasingCostsMember | 186,415 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_AcquiredInPlaceLeaseValueAndDeferredLeasingCostsMember
Finite-lived intangible assets, Accumulated Amortization | (83,540)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_AcquiredInPlaceLeaseValueAndDeferredLeasingCostsMember | (5,697)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = esrt_AcquiredInPlaceLeaseValueAndDeferredLeasingCostsMember
Acquired above-market leases [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | 84,633 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember | 72,123 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember
Finite-lived intangible assets, Accumulated Amortization | $ (15,761)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember | $ (2,858)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_AboveMarketLeasesMember

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- Definition Amount of accumulated amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
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- Definition Amount before amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Gross long-term land leases capitalized as part of real property. + References No definition available. + Details
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