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Debt - Schedule of Maturities of Long-term Debt (Details) (Mortgages [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Mortgages [Member]
Debt Instrument [Line Items]
2015 Amortization	$ 8,833esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinNextTwelveMonthsPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2016 Amortization	12,387esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearTwoPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2017 Amortization	10,070esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearThreePortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2018 Amortization	2,880esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFourPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2019 Amortization	2,188esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFivePortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2020 and thereafter amortization	11,975esrt_LongtermDebtMaturitiesRepaymentsofPrincipalafterYearFivePortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Total amortization	48,333esrt_LongtermDebtMaturitiesRepaymentsofPrincipalPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2015 Maturities	0esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinNextTwelveMonthsPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2016 Maturities	0esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearTwoPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2017 Maturities	446,761esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearThreePrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2018 Maturities	262,210esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFourPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2019 Maturities	415,000esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFivePrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2020 and thereafter maturities	427,675esrt_LongtermDebtMaturitiesRepaymentsofPrincipalafterYearFivePrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Total maturities	1,551,646esrt_LongtermDebtMaturitiesRepaymentsofPrincipalPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2015	8,833us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2016	12,387us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2017	456,831us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2018	265,090us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2019	417,188us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2020 and thereafter	439,650us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Total	$ 1,599,979us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember	$ 1,602,062us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember

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- Definition

Long-term Debt, Maturities, Repayments of Principal after Year Five, Portion Attributable to Amortization

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No definition available.

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Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months, Portion Attributable to Amortization

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Long-term Debt, Maturities, Repayments of Principal in Year Four, Portion Attributable to Amortization

+ References

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Long-term Debt, Maturities, Repayments of Principal in Year Two, Portion Attributable to Amortization

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Long-term Debt, Maturities, Repayments of Principal, Portion Attributable to Amortization

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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