Long Term Debt, Fixed Rate Debt and Floating Rate Debt, Total

No definition available.

Name:	esrt_LongTermDebtFixedRateDebtandFloatingRateDebtLessCreditFacilityandUnsecuredNotesTotal
Namespace Prefix:	esrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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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

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)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Article 5

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-Number 210

-Section 03

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Period Type:	instant

- 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 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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-Topic 835

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+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The amount of debt discount (net of debt premium) 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

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-Paragraph 1A

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ 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)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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)

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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Debt - Schedule of Long term Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Aug. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	Aug. 31, 2014
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 20,000			$ 0
Total	754,738			903,985
Revolving Credit Facility \| Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 20,000			0
Effective Rate	1.34%
Revolving Credit Facility \| Unsecured Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.15%
Revolving Credit Facility \| Term Loan
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 265,000	$ 265,000		0
Effective Rate	1.79%
Derivative, fixed interest rate	2.1485%
Revolving Credit Facility \| Term Loan \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
Mortgages
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 738,158			746,916
Floating rate mortgage debt	0			135,146
Total mortgage debt	738,158			882,062
Total principal	1,623,158			1,602,062
Unamortized premiums, net of unamortized discount	6,250			9,590
Total	1,629,408			1,611,652
Mortgages \| 10 Union Square
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 20,380			20,641
Stated Rate	6.00%
Effective Rate	6.74%
Mortgages \| 10 Bank Street
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 32,375			32,847
Stated Rate	5.72%
Effective Rate	6.21%
Mortgages \| 1542 Third Avenue
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 18,327			18,628
Stated Rate	5.90%
Effective Rate	6.57%
Mortgages \| First Stamford Place
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 239,675			242,294
Stated Rate	5.65%
Effective Rate	6.16%
Mortgages \| 1010 Third Avenue and 77 West 55th Street
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 27,200			27,595
Stated Rate	5.69%
Effective Rate	6.37%
Mortgages \| 383 Main Avenue
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 29,418			29,852
Stated Rate	5.59%
Effective Rate	6.01%
Mortgages \| 1333 Broadway
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 68,883			69,575
Stated Rate	6.32%
Effective Rate	3.79%
Mortgages \| 1400 Broadway - First Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 68,977			69,689
Stated Rate	6.12%
Effective Rate	3.34%
Mortgages \| 1400 Broadway - Second Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 9,651			9,803
Stated Rate	3.35%
Effective Rate	3.35%
Mortgages \| 112 West 34th Street - First Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 76,682			77,484
Stated Rate	6.01%
Effective Rate	3.28%
Mortgages \| 112 West 34th Street - Second Lien
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 9,671			9,763
Stated Rate	6.56%
Effective Rate	3.58%
Mortgages \| 1350 Broadway - First Lien Mortgage Loan
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 38,489			38,900
Stated Rate	5.87%
Effective Rate	3.77%
Mortgages \| Metro Center Debt
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 98,430			99,845
Stated Rate	3.59%
Effective Rate	3.67%
Mortgages \| Floating Rate Debt, One Grand Central Place - Third Lien
Debt Instrument [Line Items]
Floating rate mortgage debt	$ 0			91,000
Mortgages \| Floating Rate Debt - 1350 Broadway - 2nd Lien Mortgage Loan [Member]
Debt Instrument [Line Items]
Floating rate mortgage debt	0			44,146
Mortgages \| Floating Rate Debt - Secured Revolving Credit Facility
Debt Instrument [Line Items]
Floating rate mortgage debt	0			170,000
Mortgages \| Secured Term Credit Facility
Debt Instrument [Line Items]
Floating rate mortgage debt	0			300,000
Convertible Debt \| Exchangeable Senior Notes due August 15, 2019
Debt Instrument [Line Items]
Fixed rate mortgage debt	$ 250,000			250,000
Stated Rate	2.625%				2.625%
Effective Rate	3.93%
Senior Notes \| Series A Senior Notes due 2025
Debt Instrument [Line Items]
Total	$ 100,000			0
Stated Rate	3.93%		3.93%
Effective Rate	3.96%
Senior Notes \| Series B Senior Notes due 2027
Debt Instrument [Line Items]
Total	$ 125,000			0
Stated Rate	4.09%		4.09%
Effective Rate	4.12%
Senior Notes \| Series C Senior Notes due 2030
Debt Instrument [Line Items]
Total	$ 125,000			$ 0
Stated Rate	4.18%		4.18%
Effective Rate	4.21%