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v2.4.1.9

Debt Unsecured Loan and Notes Payable (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Oct. 06, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 15, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from mortgage notes payable | $ 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt |  | $ 191,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt |  |  |
Senior unsecured notes | 0 us-gaap_ConvertibleDebt |  | 237,667,000 us-gaap_ConvertibleDebt | 0 us-gaap_ConvertibleDebt |  |
Interest Expense | 13,147,000 us-gaap_InterestExpense | 50,660,000 us-gaap_InterestExpense | 66,456,000 us-gaap_InterestExpense |  | 54,394,000 us-gaap_InterestExpense |
Amortization of deferred finance costs and debt premiums and discount |  |  | 7,600,000 us-gaap_AmortizationOfFinancingCosts | 12,700,000 us-gaap_AmortizationOfFinancingCosts | 4,900,000 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
Proceeds from mortgage notes payable |  |  |  |  |  | 246,900,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Face amount |  |  |  |  |  | 250,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Conversion of Stock, Shares Converted |  |  |  |  |  | 51.4059 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Debt Instrument, Convertible, Conversion Price |  |  |  |  |  | $ 19.45 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Effective Rate |  |  |  |  |  | 3.80%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Senior unsecured notes |  |  |  |  |  | 236,600,000 us-gaap_ConvertibleDebt / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Adjustments To Additional Paid In Capital Convertible Debt With Conversion Feature, Gross |  |  | 13,400,000 esrt_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeatureGross / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Debt Instrument, Convertible, Remaining Discount Amortization Period |  |  |  |  |  | 5 years
Debt Instrument, Unamortized Discount |  |  | 12,300,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Payments for Underwriting Expense |  |  |  |  |  | 3,100,000 us-gaap_PaymentsForUnderwritingExpense / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Deferred Finance Costs, Noncurrent, Net |  |  |  |  |  | 2,900,000 us-gaap_DeferredFinanceCostsNoncurrentNet / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Adjustments To Additional Paid In Capital Convertible Debt With Conversion Feature, Reduction |  |  | 200,000 esrt_AdjustmentsToAdditionalPaidInCapitalConvertibleDebtWithConversionFeatureReduction / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Interest Expense, Debt |  |  | 3,800,000 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Interest Expense |  |  | 2,500,000 us-gaap_InterestExpense / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Amortization of Debt Discount (Premium) |  |  | 1,100,000 us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Amortization of deferred finance costs and debt premiums and discount |  |  | $ 200,000 us-gaap_AmortizationOfFinancingCosts / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember |  |  |
Covenant Scenario One [Member] | Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  |  |  | 130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger / esrt_ConvertibleDebtCovenantScenarioAxis = esrt_CovenantScenarioOneMember / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Debt Instrument, Convertible, Threshold Trading Days |  |  |  |  |  | 20 us-gaap_DebtInstrumentConvertibleThresholdTradingDays / esrt_ConvertibleDebtCovenantScenarioAxis = esrt_CovenantScenarioOneMember / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember
Debt Instrument, Convertible, Threshold Consecutive Trading Days |  |  |  |  |  | 30 days
Covenant Scenario Two [Member] | Convertible Debt [Member] | Exchangeable Senior Notes due August 15, 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  |  |  |  |  | 98.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger / esrt_ConvertibleDebtCovenantScenarioAxis = esrt_CovenantScenarioTwoMember / us-gaap_DebtInstrumentAxis = esrt_ExchangeableSeniorNotesdueAugust152019Member / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember

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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=31042434&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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + 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=31042434&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 03 -Paragraph 8 -Article 5 Reference 4: 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 The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
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- Definition Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + 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=6584090&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + 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 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Net amount of long-term deferred finance costs capitalized at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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