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v2.4.1.9

Debt - Senior Unsecured Notes (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Debt Instrument [Line Items] |  |
Amortization of deferred financing costs | $ 2,400,000 us-gaap_AmortizationOfFinancingCosts | $ 1,100,000 us-gaap_AmortizationOfFinancingCosts
Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Stated rate | 2.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Interest expense debt | 2,400,000 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Contractual interest rate | 1,600,000 us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Accretion of debt discount | 700,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Amortization of deferred financing costs | 100,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |
Senior Notes [Member] | Series A, Series B, and Series C Senior Unsecured Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt instrument face amount | 350,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = esrt_SeriesASeriesBandSeriesCSeniorUnsecuredNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Senior Notes [Member] | Series A Senior Notes due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Stated rate | 3.93%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esrt_SeriesASeniorNotesdue2025Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt instrument face amount | 100,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = esrt_SeriesASeniorNotesdue2025Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Senior Notes [Member] | Series B Senior Notes due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Stated rate | 4.09%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esrt_SeriesBSeniorNotesdue2027Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt instrument face amount | 125,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = esrt_SeriesBSeniorNotesdue2027Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Senior Notes [Member] | Series C Senior Notes due 2030 [Member] |  |
Debt Instrument [Line Items] |  |
Stated rate | 4.18%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esrt_SeriesCSeniorNotesdue2030Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Debt instrument face amount | $ 125,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = esrt_SeriesCSeniorNotesdue2030Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 8 -Article 9 + Details
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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=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph 8 -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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