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Related Party Transactions Releases of Guarantees (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014
Anthony E. and Peter L. Malkin [Member] | Mortgages [Member] |
Related Party Transaction [Line Items] |
Release of guarantee | $ 1,300,000,000 esrt_RelatedPartyTransactionReleaseofGuarantee / us-gaap_RelatedPartyTransactionAxis = us-gaap_MortgagesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_AnthonyE.andPeterL.MalkinMember
Anthony E. and Peter L. Malkin [Member] | Mortgages [Member] | First Stamford Place [Member] |
Related Party Transaction [Line Items] |
Number of guarantees not released | 1 esrt_RelatedPartyTransactionNumberofGuaranteesNotReleased / us-gaap_DebtInstrumentAxis = esrt_FixedRateDebtFirstStamfordPlaceMember / us-gaap_RelatedPartyTransactionAxis = us-gaap_MortgagesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = esrt_AnthonyE.andPeterL.MalkinMember
Mortgages [Member] | First Stamford Place [Member] |
Related Party Transaction [Line Items] |
Face amount | $ 250,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = esrt_FixedRateDebtFirstStamfordPlaceMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember

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- Definition Related Party Transaction, Number of Guarantees Not Released + References No definition available. + Details
Name: | esrt_RelatedPartyTransactionNumberofGuaranteesNotReleased
Namespace Prefix: | esrt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Related Party Transaction, Release of Guarantee + References No definition available. + Details
Name: | esrt_RelatedPartyTransactionReleaseofGuarantee
Namespace Prefix: | esrt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=esrt_AnthonyE.andPeterL.MalkinMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |