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Commitments and Contingencies Schedule of Contributions made to Multiemployer Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Multiemployer Plans [Line Items] |  |  |  |  |  |
Contributions | $ 10,818 us-gaap_MultiemployerPlanPeriodContributions |  | $ 4,752 us-gaap_MultiemployerPlanPeriodContributions |  | $ 2,941 us-gaap_MultiemployerPlanPeriodContributions |
Pension Plans [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Contributions | 2,871 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember | [1] | 1,201 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember | [1] | 768 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember | [1]
Pension Plans [Member] | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Contributions | 800 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember |  | 400 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember |  | 300 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPensionMember |
Health Plans [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Contributions | 7,628 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember | [2] | 3,319 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember | [2] | 2,013 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember | [2]
Health Plans [Member] | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Contributions | 1,500 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember |  | 800 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember |  | 500 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember |
Other [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Contributions | 319 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = esrt_MultiemployerPlansPensionandPostretirementBenefitMember | [3] | 232 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = esrt_MultiemployerPlansPensionandPostretirementBenefitMember | [3] | 160 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = esrt_MultiemployerPlansPensionandPostretirementBenefitMember | [3]
Other [Member] | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Contributions | $ 80 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = esrt_MultiemployerPlansPensionandPostretirementBenefitMember |  | $ 50 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = esrt_MultiemployerPlansPensionandPostretirementBenefitMember |  | $ 80 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = us-gaap_MultiemployerPlanIndividuallyInsignificantMultiemployerPlansMember / us-gaap_MultiemployerPlanTypeAxis = esrt_MultiemployerPlansPensionandPostretirementBenefitMember |
[1] | Pension plans include $0.8 million, $0.4 million and $0.3 million for the years ended 2014, 2013 and 2012, respectively, from multiemployer plans not discussed above.
[2] | Health plans include $1.5 million, $0.8 million and $0.5 million for the years ended 2014, 2013 and 2012, respectively, from multiemployer plans not discussed above.
[3] | Other includes $0.08 million, $0.05 million and $0.08 million for the years ended 2014, 2013 and 2012, respectively, in connection with other multiemployer plans not discussed above for union costs which were not itemized between pension and health plans.

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- Definition Amount of contributions made to multiemployer plans by the employer. 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 11 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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