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Debt Unsecured Revolving Credit Facility (Details) (Revolving Credit Facility [Member], USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Jan. 23, 2015
Line of Credit Facility [Line Items] |  |
Term of facility | 4 years |
Extension period | 1 year |
Extension fee percent of outstanding commitments under revolving credit facility | 0.20%esrt_LineofCreditFacilityExtensionFeePercentofOutstandingCommitmentsUnderRevolvingCreditFacility |
Subsequent Event [Member] | Unsecured Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Current borrowing capacity |  | $ 800,000,000.0 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Maximum borrowing capacity |  | $ 1,250,000,000.00 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Term of facility |  | 4 years
Extension period |  | 6 months
Extension fee percent of outstanding commitments under revolving credit facility |  | 0.075%esrt_LineofCreditFacilityExtensionFeePercentofOutstandingCommitmentsUnderRevolvingCreditFacility / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of Credit Facility, Covenant Compliance, Maximum Leverage Ratio |  | 60.00%esrt_LineofCreditFacilityCovenantComplianceMaximumLeverageRatio / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of Credit Facility, Covenant Compliance, Consolidated Secured Indebtedness to Total Asset Value |  | 40.00%esrt_LineofCreditFacilityCovenantComplianceMaximumConsolidatedSecuredIndebtednesstoAssetValue / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of Credit Facility, Covenant Compliance, Percent of Tangible Net Worth as of September 30, 2014 |  | 80.00%esrt_LineofCreditFacilityCovenantComplianceMinimumPercentofTangibleNetWorth / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of Credit Facility, Covenant Compliance, Percent of Net Equity Proceeds Received |  | 75.00%esrt_LineofCreditFacilityCovenantComplianceTangibleNetWorth.MinimumPercentofNetEquityProceedsReceived / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of Credit Facility, Covenant Compliance, Adjusted EBITDA to Consolidated Fixed Charges |  | 1.50 esrt_LineofCreditFacilityCovenantComplianceMinimumAdjustedEBITDAtoConsolidatedFixedCharges / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of Credit Facility, Covenant Compliance, Net Operating Income to Unsecured Debt |  | 1.75 esrt_LineofCreditFacilityCovenantComplianceMinimumNetOperatingIncometoUnsecuredDebt / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of Credit Facility, Covenant Compliance, Ratio of Total Unsecured Debt to Unencumbered Asset Value |  | 60.00%esrt_LineofCreditFacilityCovenantComplianceMaximumRatioofUnsecuredDebttoUnencumberedAssetValue / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Line of Credit Facility, Covenant Compliance, Consolidated Secured Recourse Debt to Asset Value |  | 10.00%esrt_LineofCreditFacilityCovenantComplianceMaximumConsolidatedSecuredRecourseDebttoAssetValue / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Eurodollar [Member] | Minimum [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 0.925%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |
Eurodollar [Member] | Minimum [Member] | Subsequent Event [Member] | Unsecured Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate |  | 0.875%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember
Eurodollar [Member] | Maximum [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 1.70%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember |
Eurodollar [Member] | Maximum [Member] | Subsequent Event [Member] | Unsecured Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate |  | 1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_EurodollarMember
Base Rate [Member] | Minimum [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |
Base Rate [Member] | Minimum [Member] | Subsequent Event [Member] | Unsecured Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate |  | 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember
Base Rate [Member] | Maximum [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate | 0.70%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |
Base Rate [Member] | Maximum [Member] | Subsequent Event [Member] | Unsecured Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate |  | 0.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_DebtInstrumentAxis = esrt_UnsecuredRevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember

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- Definition Line of Credit Facility, Covenant Compliance, Maximum Consolidated Secured Indebtedness to Asset Value + References No definition available. + Details
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Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Facility, Covenant Compliance, Maximum Consolidated Secured Recourse Debt to Asset Value + References No definition available. + Details
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Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of Credit Facility, Covenant Compliance, Maximum Leverage Ratio + References No definition available. + Details
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Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of Credit Facility, Covenant Compliance, Maximum Ratio of Unsecured Debt to Unencumbered Asset Value + References No definition available. + Details
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Namespace Prefix: | esrt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line of Credit Facility, Covenant Compliance, Minimum Adjusted EBITDA to Consolidated Fixed Charges + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Line of Credit Facility, Covenant Compliance, Minimum Net Operating Income to Unsecured Debt + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Minimum Percent of Tangible Net Worth + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Compliance, Tangible Net Worth. Minimum Percent of Net Equity Proceeds Received + References No definition available. + Details
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Balance Type: | na
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- Definition Line of Credit Facility, Extension Fee, Percent of Outstanding Commitments Under Revolving Credit Facility + References No definition available. + Details
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Period Type: | duration

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- Definition Line of Credit Facility, Extension Period + References No definition available. + Details
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Namespace Prefix: | esrt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
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- Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | credit
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- Details
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- Details
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- Details
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