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Condensed Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Tenant and other receivables allowance	1,427us-gaap_AllowanceForDoubtfulAccountsReceivable	499us-gaap_AllowanceForDoubtfulAccountsReceivable
Deferred rent receivables allowance	420esrt_AllowanceforDeferredRentReceivables	216esrt_AllowanceforDeferredRentReceivables
General partner operating partnership units, outstanding	107,200,000us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding
Limited partner operating partnership units, outstanding	159,900,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Private Perpetual Preferred Units, Liquidation Preference Per Share	16.62esrt_PrivatePerpetualPreferredUnitsLiquidationPreferencePerShare	16.62esrt_PrivatePerpetualPreferredUnitsLiquidationPreferencePerShare
Private Perpetual Preferred Units [Member]
Issuance of Common Stock (in units)	1,560,360us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = esrt_PrivatePerpetualPreferredUnitsMember	1,560,360us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = esrt_PrivatePerpetualPreferredUnitsMember
Series PR Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding	100,211,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember	84,589,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember
Series ES Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding	42,365,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = esrt_SeriesESOperatingPartnershipUnitsMember	46,134,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = esrt_SeriesESOperatingPartnershipUnitsMember
Series 60 Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding	11,465,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = esrt_Series60OperatingPartnershipUnitsMember	12,570,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = esrt_Series60OperatingPartnershipUnitsMember
Series 250 Operating Partnership Units [Member]
Limited partner operating partnership units, outstanding	5,790,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = esrt_Series250OperatingPartnershipUnitsMember	6,578,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_StatementClassOfStockAxis = esrt_Series250OperatingPartnershipUnitsMember
ESRT [Member] | Series PR Operating Partnership Units [Member]
General partner operating partnership units, outstanding	2,455,000us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember	2,455,000us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember
Limited partner operating partnership units, outstanding	0us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember	93,151,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember

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