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Related Party Transactions Related Party Revenue (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Sponsors [Member] | Family Office Services [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | $ 0.1 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionAxis = esrt_FamilyOfficeServicesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | $ 1.1 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionAxis = esrt_FamilyOfficeServicesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | $ 0.8 us-gaap_RevenueFromRelatedParties / us-gaap_RelatedPartyTransactionAxis = esrt_FamilyOfficeServicesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Third party management and other fees [Member] | Sponsors [Member] | Supervisory Fee Revenue [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | 2.0 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_SupervisoryFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 2.8 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_SupervisoryFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 1.9 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_SupervisoryFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Third party management and other fees [Member] | Sponsors [Member] | Property Management Fee Revenue [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | 0.4 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_PropertyManagementFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 1.6 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_PropertyManagementFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 1.0 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_PropertyManagementFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Third party management and other fees [Member] | Equity Method Investee [Member] | Supervisory Fee Revenue [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties |  | 0.6 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_SupervisoryFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember | 0.8 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_SupervisoryFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Third party management and other fees [Member] | Equity Method Investee [Member] | Property Management Fee Revenue [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties |  | 0.1 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_PropertyManagementFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember | 1.2 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_PropertyManagementFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Other income and fees [Member] | Sponsors [Member] | Profit Share [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties |  | 3.3 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_ProfitShareMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 0.7 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_ProfitShareMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Other income and fees [Member] | Sponsors [Member] | Other Fees and Disbursements from Non-Controlled Affiliates [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties |  | 0 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_OtherFeesandDisbursementsfromNonControlledAffiliatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | 0.6 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_OtherFeesandDisbursementsfromNonControlledAffiliatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
Other income and fees [Member] | Equity Method Investee [Member] | Profit Share [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties |  | 0.4 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_ProfitShareMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember | 0.9 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_ProfitShareMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Other income and fees [Member] | Equity Method Investee [Member] | Other Fees and Disbursements from Non-Controlled Affiliates [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties |  | 1.1 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_OtherFeesandDisbursementsfromNonControlledAffiliatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember | 1.3 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_OtherFeesandDisbursementsfromNonControlledAffiliatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Due from related parties |  |  | 0.4 us-gaap_DueFromOfficersOrStockholders / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_OtherFeesandDisbursementsfromNonControlledAffiliatesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember
Other income and fees [Member] | Equity Method Investee [Member] | Other Fees Reimbursed on the Equity Method for Offering Costs Related to Offering [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties |  | $ 1.1 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_OtherFeesReimbursedontheEquityMethodforOfferingCostsRelatedtoOfferingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember | $ 1.3 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_OtherRealEstateRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_OtherFeesReimbursedontheEquityMethodforOfferingCostsRelatedtoOfferingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_EquityMethodInvesteeMember

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- Definition For an unclassified balance sheet, amounts due from owners or owners with a beneficial interest of more than 10 percent of the voting interests or officers of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 07 -Paragraph b -Subparagraph 1 -Article 6 + Details
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