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Commitments and Contingencies Multiemployer Pension and Defined Contribution Plans Narrative (Details) (Building Service 32BJ [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2012
Pension Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan contributions | $ 224.5 us-gaap_MultiemployerPlansPlanContributions / us-gaap_MultiemployerPlanNameAxis = esrt_BuildingService32BJMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember | $ 221.9 us-gaap_MultiemployerPlansPlanContributions / us-gaap_MultiemployerPlanNameAxis = esrt_BuildingService32BJMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember | $ 212.7 us-gaap_MultiemployerPlansPlanContributions / us-gaap_MultiemployerPlanNameAxis = esrt_BuildingService32BJMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember
Health Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan contributions |  | $ 923.5 us-gaap_MultiemployerPlansPlanContributions / us-gaap_MultiemployerPlanNameAxis = esrt_BuildingService32BJMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember | $ 893.3 us-gaap_MultiemployerPlansPlanContributions / us-gaap_MultiemployerPlanNameAxis = esrt_BuildingService32BJMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember

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

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- Definition Amount of contributions made to the multiemployer plan by all employers who participate in the plan. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450678-114947 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration