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Acquisitions Narrative (Details) (USD $)	0 Months Ended		3 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Jul. 15, 2014	Oct. 06, 2013 entity	Dec. 31, 2013	Dec. 31, 2014	Oct. 06, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 733,600,000us-gaap_BusinessCombinationConsiderationTransferred1
Number of entities acquired		4us-gaap_NumberOfBusinessesAcquired
Gain on consolidation of non-controlled entities			322,563,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Goodwill			491,479,000us-gaap_Goodwill	491,479,000us-gaap_Goodwill
Ground Lease [Member]
Business Acquisition [Line Items]
Weighted average useful life				26 years 4 months 30 days
Leases and Deferred Leasing Costs [Member]
Business Acquisition [Line Items]
Weighted average useful life				4 years 10 months 30 days
Acquired above-market leases [Member]
Business Acquisition [Line Items]
Weighted average useful life				4 years 2 months 30 days
Below Market Lease [Member]
Business Acquisition [Line Items]
Weighted average useful life				4 years 4 months 30 days
112 West 34th Street [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	423,600,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Debt assumed	87,700,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Payments to Acquire Businesses, Gross	106,900,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	229,000,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Business Acquisition, Share Price	$ 16.65us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Location 1400 Broadway [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	310,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Debt assumed	80,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Payments to Acquire Businesses, Gross	79,700,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	150,300,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Business Acquisition, Share Price	$ 16.65us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Total Acquisitions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		1,171,841,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember
Gain on consolidation of non-controlled entities		214,300,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember
Goodwill		491,479,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember			491,479,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember
Debt assumed	167,684,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember	124,354,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember
Empire State Building Observatory Operations [Member]
Business Acquisition [Line Items]
Goodwill		227,500,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingObservatoryOperationsMember			227,500,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingObservatoryOperationsMember
Empire State Building, L.L.C. [Member]
Business Acquisition [Line Items]
Goodwill		250,800,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingL.L.C.Member			250,800,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingL.L.C.Member
1333 Broadway Associates [Member]
Business Acquisition [Line Items]
Gain on consolidation of non-controlled entities		41,000,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = esrt_Location1333BroadwayAssociatesMember
1350 Broadway Associates [Member]
Business Acquisition [Line Items]
Gain on consolidation of non-controlled entities		32,100,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = esrt_Location1350BroadwayAssociatesMember
Empire State Building Company L.L.C. and 501 Seventh Avenue Associates L.L.C. [Member] [Member]
Business Acquisition [Line Items]
Gain on consolidation of non-controlled entities		35,200,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingCompanyL.L.C.and501SeventhAvenueAssociatesL.L.C.MemberMember
501 Seventh Avenue Associates [Member]
Business Acquisition [Line Items]
Goodwill		13,200,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_Location501SeventhAvenueAssociatesMember			13,200,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_Location501SeventhAvenueAssociatesMember
Predecessor [Member]
Business Acquisition [Line Items]
Gain on consolidation of non-controlled entities					0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember	0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Noncontrolling interest ownership interest fair value		302,700,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Noncontrolling interest ownership interest cost		88,400,000us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember			$ 88,400,000us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | Empire State Building Co. [Member]
Business Acquisition [Line Items]
Ownership percentage		23.75%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingCo.Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember			23.75%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingCo.Member / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | 1333 Broadway Associates [Member]
Business Acquisition [Line Items]
Ownership percentage		50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = esrt_Location1333BroadwayAssociatesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember			50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = esrt_Location1333BroadwayAssociatesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | 1350 Broadway Associates [Member]
Business Acquisition [Line Items]
Ownership percentage		50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = esrt_Location1350BroadwayAssociatesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember			50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = esrt_Location1350BroadwayAssociatesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | 501 Seventh Avenue Associates [Member]
Business Acquisition [Line Items]
Ownership percentage		20.469%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = esrt_Location501SeventhAvenueAssociatesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember			20.469%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = esrt_Location501SeventhAvenueAssociatesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Common Class A [Member] | 112 West 34th Street [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	1,217,685us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class A [Member] | Location 1400 Broadway [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	1,338,488us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common Class B [Member] | 112 West 34th Street [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	77,945us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common Class B [Member] | Location 1400 Broadway [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	32,452us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Series ES Operating Partnership Units [Member] | 112 West 34th Street [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	12,457,379us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember / us-gaap_StatementClassOfStockAxis = esrt_SeriesESOperatingPartnershipUnitsMember
Series ES Operating Partnership Units [Member] | Location 1400 Broadway [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	7,658,516us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember / us-gaap_StatementClassOfStockAxis = esrt_SeriesESOperatingPartnershipUnitsMember

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares of equity interests issued or issuable to acquire entity.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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