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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 | $ 733,600,000 us-gaap_BusinessCombinationConsiderationTransferred1 |  |  |  |  |
Number of entities acquired |  | 4 us-gaap_NumberOfBusinessesAcquired |  |  |  |
Gain on consolidation of non-controlled entities |  |  | 322,563,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |  |
Goodwill |  |  | 491,479,000 us-gaap_Goodwill | 491,479,000 us-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 | 423,600,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember |  |  |  |  |
Debt assumed | 87,700,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember |  |  |  |  |
Payments to Acquire Businesses, Gross | 106,900,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 229,000,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember |  |  |  |  |
Business Acquisition, Share Price | $ 16.65 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember |  |  |  |  |
Location 1400 Broadway [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred | 310,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember |  |  |  |  |
Debt assumed | 80,000,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember |  |  |  |  |
Payments to Acquire Businesses, Gross | 79,700,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 150,300,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember |  |  |  |  |
Business Acquisition, Share Price | $ 16.65 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember |  |  |  |  |
Total Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred |  | 1,171,841,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |  |  |
Gain on consolidation of non-controlled entities |  | 214,300,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |  |  |
Goodwill |  | 491,479,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |  | 491,479,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |
Debt assumed | 167,684,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember | 124,354,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_TotalAcquisitionsMember |  |  |  |
Empire State Building Observatory Operations [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 227,500,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingObservatoryOperationsMember |  |  | 227,500,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingObservatoryOperationsMember |
Empire State Building, L.L.C. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 250,800,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingL.L.C.Member |  |  | 250,800,000 us-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 |  | 41,000,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = esrt_Location1333BroadwayAssociatesMember |  |  |  |
1350 Broadway Associates [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain on consolidation of non-controlled entities |  | 32,100,000 us-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 |  | 35,200,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = esrt_EmpireStateBuildingCompanyL.L.C.and501SeventhAvenueAssociatesL.L.C.MemberMember |  |  |  |
501 Seventh Avenue Associates [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 13,200,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_Location501SeventhAvenueAssociatesMember |  |  | 13,200,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = esrt_Location501SeventhAvenueAssociatesMember |
Predecessor [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Gain on consolidation of non-controlled entities |  |  |  |  | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Noncontrolling interest ownership interest fair value |  | 302,700,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  |  |
Noncontrolling interest ownership interest cost |  | 88,400,000 us-gaap_EquityMethodInvestmentAggregateCost / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember |  |  | $ 88,400,000 us-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 | 1,217,685 us-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 | 1,338,488 us-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 | 77,945 us-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 | 32,452 us-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 | 12,457,379 us-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 | 7,658,516 us-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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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