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Debt Schedule of Maturities of Long-term Debt (Details) (Mortgages [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Mortgages [Member]
Debt Instrument [Line Items]
2015 amortization	$ 11,772esrt_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	14,163esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFivePortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Total amortization	51,272esrt_LongtermDebtMaturitiesRepaymentsofPrincipalPortionAttributabletoAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2015 maturities	44,146esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinNextTwelveMonthsPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2016 maturities	0esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearTwoPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2017 maturities	616,760esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearThreePrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2018 maturities	562,210esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFourPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2019 maturities	327,674esrt_LongtermDebtMaturitiesRepaymentsofPrincipalinYearFivePrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Total maturities	1,550,790esrt_LongtermDebtMaturitiesRepaymentsofPrincipalPrincipalMaturities / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2015	55,918us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2016	12,387us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2017	626,830us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2018	565,090us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
2019	341,837us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Total	$ 1,602,062us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember	$ 1,196,419us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember

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

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- Definition

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

+ References

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- Definition

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

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- Definition

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- Definition

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

+ References

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+ References

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

+ References

No definition available.

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

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No definition available.

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- Definition

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.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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-Publisher SEC

-Name Regulation S-X (SX)

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-Section 03

-Paragraph 16

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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-Publisher FASB

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-Topic 470

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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-Publisher FASB

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 470

-SubTopic 10

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 470

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