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Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Commercial real estate properties, at cost:
Land	$ 201,196us-gaap_Land	$ 187,566us-gaap_Land
Development costs	6,986us-gaap_DevelopmentInProcess	6,459us-gaap_DevelopmentInProcess
Building and improvements	1,931,681us-gaap_InvestmentBuildingAndBuildingImprovements	1,455,398us-gaap_InvestmentBuildingAndBuildingImprovements
Commercial real estate properties, at cost, gross	2,139,863us-gaap_RealEstateInvestmentPropertyAtCost	1,649,423us-gaap_RealEstateInvestmentPropertyAtCost
Less: accumulated depreciation	(377,552)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation	(295,351)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Commercial real estate properties, net	1,762,311us-gaap_RealEstateInvestmentPropertyNet	1,354,072us-gaap_RealEstateInvestmentPropertyNet
Cash and cash equivalents	45,732us-gaap_CashAndCashEquivalentsAtCarryingValue	60,743us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash	60,273us-gaap_RestrictedCashAndCashEquivalents	55,621us-gaap_RestrictedCashAndCashEquivalents
Tenant and other receivables, net of allowance of $1,427 and $499 in 2014 and 2013, respectively	23,745us-gaap_AccountsAndNotesReceivableNet	24,817us-gaap_AccountsAndNotesReceivableNet
Deferred rent receivables, net of allowance of $420 and $216 in 2014 and 2013, respectively	102,104us-gaap_DeferredRentReceivablesNet	62,689us-gaap_DeferredRentReceivablesNet
Prepaid expenses and other assets	48,504us-gaap_PrepaidExpenseAndOtherAssets	35,407us-gaap_PrepaidExpenseAndOtherAssets
Deferred costs, net	80,212us-gaap_DeferredCostsCurrentAndNoncurrent	78,938us-gaap_DeferredCostsCurrentAndNoncurrent
Acquired below market ground lease, net	391,887us-gaap_GroundLeasesNet	62,312us-gaap_GroundLeasesNet
Acquired lease intangibles, net	290,248us-gaap_FiniteLivedIntangibleAssetsNet	249,983us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill	491,479us-gaap_Goodwill	491,479us-gaap_Goodwill
Total assets	3,296,495us-gaap_Assets	2,476,061us-gaap_Assets
Liabilities:
Mortgage notes payable	903,985us-gaap_LongTermDebt	883,112us-gaap_LongTermDebt
Term loan and credit facility	470,000us-gaap_LineOfCreditFacilityAmountOutstanding	325,000us-gaap_LineOfCreditFacilityAmountOutstanding
Senior unsecured notes	237,667us-gaap_ConvertibleDebt	0us-gaap_ConvertibleDebt
Accounts payable and accrued expenses	96,563esrt_AccountsPayableandAccruedExpenses	81,908esrt_AccountsPayableandAccruedExpenses
Acquired below market leases, net	138,859us-gaap_BelowMarketLeaseNet	129,882us-gaap_BelowMarketLeaseNet
Deferred revenue and other liabilities	27,876esrt_DeferredRevenueandOtherLiabilities	21,568esrt_DeferredRevenueandOtherLiabilities
Tenants’ security deposits	40,448us-gaap_SecurityDepositLiability	31,406us-gaap_SecurityDepositLiability
Total liabilities	1,915,398us-gaap_Liabilities	1,472,876us-gaap_Liabilities
Capital:
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 and 0 issued and outstanding in 2014 and 2013, respectively	8,004esrt_PrivatePerpetualPreferredUnitsIssuedValue	0esrt_PrivatePerpetualPreferredUnitsIssuedValue
Total capital	1,381,097us-gaap_PartnersCapital	1,003,185us-gaap_PartnersCapital
Total liabilities and capital	3,296,495us-gaap_LiabilitiesAndStockholdersEquity	2,476,061us-gaap_LiabilitiesAndStockholdersEquity
Series PR Operating Partnership Units [Member]
Capital:
ESRT partners' capital (2,671,043 and 2,454,770 general partner operating partnership units and 104,520,844 and 93,151,383 limited partner operating partnership units outstanding at December 31, 2014 and 2013, respectively)	468,638esrt_GeneralLimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember	385,158esrt_GeneralLimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember
Limited partner operating partnership units	868,163us-gaap_LimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember	571,763us-gaap_LimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_SeriesPRCommonUnitsMember
Series ES Operating Partnership Units [Member]
Capital:
Limited partner operating partnership units	26,488us-gaap_LimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_SeriesESOperatingPartnershipUnitsMember	32,698us-gaap_LimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_SeriesESOperatingPartnershipUnitsMember
Series 60 Operating Partnership Units [Member]
Capital:
Limited partner operating partnership units	6,567us-gaap_LimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_Series60OperatingPartnershipUnitsMember	8,866us-gaap_LimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_Series60OperatingPartnershipUnitsMember
Series 250 Operating Partnership Units [Member]
Capital:
Limited partner operating partnership units	$ 3,237us-gaap_LimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_Series250OperatingPartnershipUnitsMember	$ 4,700us-gaap_LimitedPartnersCapitalAccount / us-gaap_StatementClassOfStockAxis = esrt_Series250OperatingPartnershipUnitsMember

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

+ References

No definition available.

+ Details

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X

- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.7-03.1(3))



-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910







Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 1



-Article 7

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- Definition

Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.7-03.1(d))



-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.7-03.1(d))



-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Period Type:	instant

X

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

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



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 1



-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 210.5-02.1)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.7-03.15(a))



-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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