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Summary of Significant Accounting Policies Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 segment | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 06, 2013
Accounting Policies [Line Items] |  |  |  |
Lease cancellation fees | $ 6.1 esrt_LeaseCancellationFees | $ 1.6 esrt_LeaseCancellationFees | $ 3.9 esrt_LeaseCancellationFees |
Deferred revenue | 4.5 us-gaap_DeferredRevenue | 3.7 us-gaap_DeferredRevenue |  |
Advertising expense | 10.0 us-gaap_AdvertisingExpense | 4.2 us-gaap_AdvertisingExpense | 1.3 us-gaap_AdvertisingExpense |
Transaction costs | 33.5 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts |  |  |
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Operating loss carryforwards |  |  |  | $ 13.4 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember
Predecessor [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Number of LLC's |  |  |  | 2 esrt_NumberofLimitedLiabilityCompanies / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Building and Building Improvements [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life | 39 years |  |  |
Corporate Equipment [Member] | Minimum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life | 3 years |  |  |
Corporate Equipment [Member] | Maximum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Useful life | 7 years |  |  |

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- Definition Lease Cancellation Fees + References No definition available. + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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