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Related Party Transactions - Related Party Revenue (Details) (Third party management and other fees [Member], Sponsors [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Supervisory 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_SupervisoryFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember | $ 0.5 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_SupervisoryFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember
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_AffiliatedEntityMember | $ 0.1 us-gaap_RevenueFromRelatedParties / us-gaap_IncomeStatementLocationAxis = esrt_ManagementFeesRevenueMember / us-gaap_RelatedPartyTransactionAxis = esrt_PropertyManagementFeeRevenueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_AffiliatedEntityMember

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- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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 FASB -Name Accounting Standards Codification -Glossary Related Parties -URI http://asc.fasb.org/extlink&oid=16382449 Reference 3: 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 + Details
Name: | us-gaap_RevenueFromRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration