Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Commercial real estate properties, at cost:
Land	$ 201,196us-gaap_Land	$ 201,196us-gaap_Land
Development costs	7,332us-gaap_DevelopmentInProcess	6,986us-gaap_DevelopmentInProcess
Building and improvements	1,967,260	1,931,681
Commercial real estate properties, at cost, gross	2,175,788	2,139,863
Less: accumulated depreciation	(399,851)	(377,552)
Commercial real estate properties, net	1,775,937us-gaap_RealEstateInvestmentPropertyNet	1,762,311us-gaap_RealEstateInvestmentPropertyNet
Cash and cash equivalents	36,463	45,732
Restricted cash	61,007	60,273
Tenant and other receivables, net of allowance of $2,803 and $1,427 in 2015 and 2014, respectively	12,759us-gaap_AccountsAndNotesReceivableNet	23,745us-gaap_AccountsAndNotesReceivableNet
Deferred rent receivables, net of allowance of $437 and $420 in 2015 and 2014, respectively	106,226us-gaap_DeferredRentReceivablesNet	102,104us-gaap_DeferredRentReceivablesNet
Prepaid expenses and other assets	30,715us-gaap_PrepaidExpenseAndOtherAssets	48,504us-gaap_PrepaidExpenseAndOtherAssets
Deferred costs, net	95,551	80,212
Acquired below-market ground leases, net	389,765us-gaap_GroundLeasesNet	391,887us-gaap_GroundLeasesNet
Acquired lease intangibles, net	273,086us-gaap_FiniteLivedIntangibleAssetsNet	290,248us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill	491,479us-gaap_Goodwill	491,479us-gaap_Goodwill
Total assets	3,272,988us-gaap_Assets	3,296,495us-gaap_Assets
Liabilities:
Mortgage notes payable	855,032us-gaap_LongTermDebt	903,985us-gaap_LongTermDebt
Senior unsecured notes	588,335us-gaap_ConvertibleDebt	237,667us-gaap_ConvertibleDebt
Unsecured revolving credit facility	165,000us-gaap_UnsecuredDebt	0us-gaap_UnsecuredDebt
Term loan and credit facility	0us-gaap_LineOfCredit	470,000us-gaap_LineOfCredit
Accounts payable and accrued expenses	101,797esrt_AccountsPayableandAccruedExpenses	96,563esrt_AccountsPayableandAccruedExpenses
Acquired below-market leases, net	129,736us-gaap_BelowMarketLeaseNet	138,859us-gaap_BelowMarketLeaseNet
Deferred revenue and other liabilities	20,994esrt_DeferredRevenueandOtherLiabilities	27,876esrt_DeferredRevenueandOtherLiabilities
Tenants’ security deposits	44,388us-gaap_SecurityDepositLiability	40,448us-gaap_SecurityDepositLiability
Total liabilities	1,905,282us-gaap_Liabilities	1,915,398us-gaap_Liabilities
Commitments and Contingencies
Empire State Realty Trust, Inc. stockholders' equity:
Preferred stock, $0.01 par value per share, 50,000,000 shares authorized, none issued or outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Additional paid-in capital	426,481us-gaap_AdditionalPaidInCapital	406,853us-gaap_AdditionalPaidInCapital
Retained earnings	54,445	60,713
Total Empire State Realty Trust, Inc.'s stockholders' equity	482,043us-gaap_StockholdersEquity	468,638us-gaap_StockholdersEquity
Private perpetual preferred units, $16.62 per unit liquidation preference, 1,560,360 issued and outstanding in 2015 and 2014	8,004	8,004
Non-controlling interests in operating partnership	877,659us-gaap_MinorityInterest	904,455us-gaap_MinorityInterest
Total equity	1,367,706	1,381,097
Total liabilities and equity	3,272,988	3,296,495
Common Class A [Member]
Empire State Realty Trust, Inc. stockholders' equity:
Common stock	1,106	1,060
Common Class B [Member]
Empire State Realty Trust, Inc. stockholders' equity:
Common stock	$ 11	$ 12

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Private Perpetual Preferred Units, Issued, Value

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Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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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.

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The carrying amount of deferred costs.

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The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee.

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The current amount of expenditures for a real estate project that has not yet been completed.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Net long-term land leases which are capitalized as part of real property.

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No definition available.

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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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.

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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.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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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.

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

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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.

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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.

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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

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

- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Article 3

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.5-02.31(a)(3))

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

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- 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.

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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 4.E)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29-31)

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

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- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4568447-111683

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-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4I

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4590271-111686

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.16)

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-Publisher FASB

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-Section S99

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-Subparagraph (SX 210.7-03.16)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

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