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Description of Business and Organization Description of Business and Organization Narrative (Details) (USD $)	0 Months Ended	9 Months Ended	12 Months Ended		0 Months Ended
	Oct. 06, 2013 entity	Oct. 06, 2013	Dec. 31, 2014 entity sqft	Dec. 31, 2012	Sep. 28, 2012
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the Company, percent			40.10%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Area of real estate property			10,000,000us-gaap_AreaOfRealEstateProperty
Operating partnership units issued during period	$ 2,800,000,000esrt_LimitedPartnersCapitalAccountUnitsIssuedDuringPeriodValue
Number of entities to be treated as TRS's			2esrt_NumberofEntitiestobeTreatedasTaxableREITSubsidiary
Contributions		8,223,000us-gaap_PartnersCapitalAccountContributions		2,107,000us-gaap_PartnersCapitalAccountContributions
Number of entities acquired	4us-gaap_NumberOfBusinessesAcquired
Predecessor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			380,000us-gaap_AreaOfRealEstateProperty / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | New York State Supreme Court, New York County [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Damages awarded					55,000,000us-gaap_LossContingencyDamagesAwardedValue / us-gaap_LitigationCaseAxis = esrt_NewYorkStateSupremeCourtNewYorkCountyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Percent of damages awarded required to be in cash					80.00%esrt_LossContingencyDamagesAwardedPercentinCashMinimum / us-gaap_LitigationCaseAxis = esrt_NewYorkStateSupremeCourtNewYorkCountyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Maximum percent of freely-tradable common stock or partnership units					20.00%esrt_LossContingencyDamagesAwardedFreelytradableCommonStockorOperatingUnitsMaximum / us-gaap_LitigationCaseAxis = esrt_NewYorkStateSupremeCourtNewYorkCountyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Contributions					55,000,000us-gaap_PartnersCapitalAccountContributions / us-gaap_LitigationCaseAxis = esrt_NewYorkStateSupremeCourtNewYorkCountyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Secured Revolving and Term Credit Facility [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Current borrowing capacity	800,000,000.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = esrt_SecuredRevolvingandTermCreditFacilityMember	800,000,000.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = esrt_SecuredRevolvingandTermCreditFacilityMember	800,000,000.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = esrt_SecuredRevolvingandTermCreditFacilityMember
Maximum borrowing capacity	1,250,000,000.00us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = esrt_SecuredRevolvingandTermCreditFacilityMember	1,250,000,000.00us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = esrt_SecuredRevolvingandTermCreditFacilityMember	1,250,000,000.00us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = esrt_SecuredRevolvingandTermCreditFacilityMember
ESRT [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the Company, percent			40.10%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
ESRT [Member] | Predecessor [Member] | New York State Supreme Court, New York County [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Maximum percent of freely-tradable common stock or partnership units					20.00%esrt_LossContingencyDamagesAwardedFreelytradableCommonStockorOperatingUnitsMaximum / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LitigationCaseAxis = esrt_NewYorkStateSupremeCourtNewYorkCountyMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Accredited Investor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Operating partnership units issued during period (in shares)	149,000,000esrt_LimitedPartnersCapitalAccountUnitsIssuedDuringPeriod / us-gaap_TitleOfIndividualAxis = esrt_AccreditedPriorInvestorMember
Operating partnership units issued during period	2,100,000,000esrt_LimitedPartnersCapitalAccountUnitsIssuedDuringPeriodValue / us-gaap_TitleOfIndividualAxis = esrt_AccreditedPriorInvestorMember
Non-accredited Prior Investors [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Operating partnership units issued during period	$ 733,300,000esrt_LimitedPartnersCapitalAccountUnitsIssuedDuringPeriodValue / us-gaap_TitleOfIndividualAxis = esrt_NonaccreditedPriorInvestorsMember
Common Class A [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Common Stock (in units)	82,200,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Share price (in dollars per share)	$ 13.00us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	$ 13.00us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class A [Member] | ESRT [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Par value			0.01us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class A [Member] | Accredited Investor [Member] | ESRT [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Issuance of Common Stock (in units)	12,100,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_TitleOfIndividualAxis = esrt_AccreditedPriorInvestorMember
Series PR Operating Partnership Units [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Operating partnership units issued during period (in shares)	82,200,000esrt_LimitedPartnersCapitalAccountUnitsIssuedDuringPeriod / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember
Series PR Operating Partnership Units [Member] | Accredited Investor [Member] | ESRT [Member]
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Operating partnership units issued during period (in shares)	13,200,000esrt_LimitedPartnersCapitalAccountUnitsIssuedDuringPeriod / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember / us-gaap_TitleOfIndividualAxis = esrt_AccreditedPriorInvestorMember
Common Class B [Member] | Accredited Investor [Member] | ESRT [Member]
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Issuance of Common Stock (in units)	1,100,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_TitleOfIndividualAxis = esrt_AccreditedPriorInvestorMember
Office Building [Member]
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Area of real estate property			9,300,000us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Number of properties			14us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember
Office Building [Member] | Manhattan [Member]
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Area of real estate property			7,400,000us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanMember
Number of properties			9us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanMember
Office Building [Member] | Fairfield County, Connecticut and Westchester County, New York [Member]
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Area of real estate property			1,900,000us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_StatementGeographicalAxis = esrt_FairfieldCountyConnecticutandWestchesterCountyNewYorkMember
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Retail Site [Member] | Manhattan and Westport, Connecticut [Member]
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Area of real estate property			204,175us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanandWestportConnecticutMember
Retail Site [Member] | Manhattan [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			523,463us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanMember
Number of properties			4us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_StatementGeographicalAxis = esrt_ManhattanMember
Retail Site [Member] | Westport, Connecticut [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties			2us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_RetailSiteMember / us-gaap_StatementGeographicalAxis = esrt_WestportConnecticutMember
Other Property [Member] | Stamford, Connecticut [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			380,000us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OtherPropertyMember / us-gaap_StatementGeographicalAxis = esrt_StamfordConnecticutMember
Development Parcel [Member] | Consolidated Properties [Member] | Predecessor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties			1us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = esrt_DevelopmentParcelMember / us-gaap_RealEstatePropertiesAxis = us-gaap_ConsolidatedPropertiesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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