Number of Vesting Installments

No definition available.

Name:	esrt_NumberofVestingInstallments
Namespace Prefix:	esrt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Percentage After Five Years

+ References

No definition available.

+ Details

Name:	esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPercentageAfterFiveYears
Namespace Prefix:	esrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Percentage After Four Years

+ References

No definition available.

+ Details

Name:	esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPercentageAfterFourYears
Namespace Prefix:	esrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Percentage After Three Years

+ References

No definition available.

+ Details

Name:	esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPercentageAfterThreeYears
Namespace Prefix:	esrt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument other than Options, Forfeitures Rate

+ References

No definition available.

+ Details

Name:	esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentotherthanOptionsForfeituresRate
Namespace Prefix:	esrt_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value

+ References

No definition available.

+ Details

Name:	esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsGrantedinPeriodFairValue
Namespace Prefix:	esrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Look-Back Period

+ References

No definition available.

+ Details

Name:	esrt_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateLookBackPeriod
Namespace Prefix:	esrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based Payment Arrangement by Share-based Payment Award, Equity Other than Options, Vesting Threshold, Age of Grantee

+ References

No definition available.

+ Details

Name:	esrt_SharebasedPaymentArrangementbySharebasedPaymentAwardEquityOtherthanOptionsVestingThresholdAgeofGrantee
Namespace Prefix:	esrt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_VestingAxis=esrt_AwardsthatMeetAgeandServiceRequirementsforVestingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=esrt_AwardsthatDoNotMeetAgeandServiceRequirementsforVestingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=esrt_LongTermIncentivePlanUnitsandRestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=esrt_LongTermIncentivePlanUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=esrt_TimeBasedLongTernIncentivePlanUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=esrt_PerformanceBasedLongTermIncentivePlanUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=esrt_TimeRestrictedSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=esrt_LongTermIncentivePlanUnitandRestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=esrt_A2013PlanUnitsVestingFebruary2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=esrt_A2013PlanUnitsVestingJune2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=esrt_A2013PlanUnitsVestingJanuary2018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=esrt_A2013PlanUnitsVestingFebruary2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=esrt_A2013PlanUnitsVestingFebruary2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=esrt_OtherEmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=esrt_PerformanceRestrictedSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=esrt_A2013PlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Capital - Incentive and Share-based Compensation (Details) $ / shares in Units, $ in Millions	1 Months Ended					3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares	Feb. 29, 2016 USD ($) vesting_installment shares	Jun. 30, 2015 USD ($) shares	Feb. 28, 2015 USD ($) tranche vesting_installment shares	Jan. 31, 2015 USD ($) shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate look-back period (in years)								6 years
Annual forfeiture rate, percent								0.05
Weighted Average Grant Fair Value [Roll Forward]
Beginning balance, Unvested, Weighted Average Grant Fair Value (in USD per share) \| $ / shares								$ 11.04
Vested, Weighted Average Grant Fair Value (in USD per share) \| $ / shares								15.89
Granted, Weighted Average Grant Fair Value (in USD per share) \| $ / shares								9.58
Forfeited, Weighted Average Grant Fair Value (in USD per share) \| $ / shares								17.97
Ending balance, Unvested, Weighted Average Grant Fair Value (in USD per share) \| $ / shares	$ 10.00					$ 10.00		$ 10.00		$ 11.04
Age of grantee at which LTIP unit and restricted stock awards immediately vest								60 years
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest								10 years
Awards that Meet Age and Service Requirements for Vesting
Weighted Average Grant Fair Value [Roll Forward]
Noncash share-based compensation expense recognized \| $						$ 0.1		$ 0.5	$ 0.5
Unrecognized compensation expense \| $	$ 0.6					0.6		$ 0.6
Unrecognized compensation expense, period for recognition (in years)								2 years 3 months 18 days
Awards that Do Not Meet Age and Service Requirements for Vesting
Weighted Average Grant Fair Value [Roll Forward]
Noncash share-based compensation expense recognized \| $						2.5	$ 1.2	$ 4.2	$ 2.4
Unrecognized compensation expense \| $	$ 23.5					$ 23.5		$ 23.5
Unrecognized compensation expense, period for recognition (in years)								2 years 9 months 18 days
Long-Term Incentive Plan Units and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $								$ 18.4
Risk free interest rate								0.84%
Expected volatility rate								24.00%
Weighted Average Grant Fair Value [Roll Forward]
Granted, Weighted Average Grant Fair Value (in USD per share) \| $ / shares								$ 9.60
Long-Term Incentive Plan Unit [Member]
Restricted Stock and LTIP Unit Activity [Roll Forward]
Beginning balance, Unvested (in shares)								1,415,895
Vested (in shares)								(124,843)
Granted (in shares)								1,868,629
Forfeited (in shares)								0
Ending balance, Unvested (in shares)	3,159,681					3,159,681		3,159,681		1,415,895
Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $	$ 0.1	$ 1.4		$ 0.8
Number of Vesting Installments		3		3
Award vesting period (in years)		4 years		4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		47,168		33,398
Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $		$ 0.8		$ 0.4
Number of Vesting Installments		2		2
Award vesting period (in years)		3 years		3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		112,925		33,398
Restricted Stock
Restricted Stock and LTIP Unit Activity [Roll Forward]
Beginning balance, Unvested (in shares)								97,592
Vested (in shares)								(4,350)
Granted (in shares)								47,071
Forfeited (in shares)								(278)
Ending balance, Unvested (in shares)	140,035					140,035		140,035		97,592
Time Restricted Shares
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		44,198
Long-Term Incentive Plan Unit and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term								2 years 9 months 18 days
Dividend rate								2.10%
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual forfeiture rate, percent								0.00
Director \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units Vesting February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $			$ 0.6
Award vesting period (in years)			3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)			35,082
Director \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units Vesting three years after June 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $	$ 0.8
Award vesting period (in years)	3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	43,257
Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual forfeiture rate, percent								0.00
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units Vesting January 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $				$ 2.9
Number of Vesting Installments \| tranche				3
Award vesting period (in years)				4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				168,033
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units Vesting February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $				$ 0.2
Number of Vesting Installments \| vesting_installment				3
Award vesting period (in years)				4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				13,736
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units Vesting January 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $		$ 5.6
Number of Vesting Installments \| vesting_installment		3
Award vesting period (in years)		4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		368,225
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units Vesting three years after February 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $		$ 1.0
Award vesting percentage after three years		30.00%
Award vesting percentage after four years		30.00%
Award vesting percentage after five years		40.00%
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		62,814
Executive Officer \| Performance Based Long-Term Incentive Plan Unit \| 2013 Plan Units Vesting January 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $				$ 1.3
Number of Vesting Installments \| tranche				2
Award vesting period (in years)				3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				154,266
Executive Officer \| Performance Based Long-Term Incentive Plan Unit \| 2013 Plan Units Vesting February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $				$ 0.1
Number of Vesting Installments \| vesting_installment				2
Award vesting period (in years)				3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				13,736
Executive Officer \| Performance Based Long-Term Incentive Plan Unit \| 2013 Plan Units Vesting January 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $		$ 8.8
Number of Vesting Installments \| vesting_installment		2
Award vesting period (in years)		3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		1,230,228
Other Employees \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units Vesting February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $										$ 0.1
ESRT \| Performance Restricted Shares
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				14,315
ESRT \| Time Restricted Shares
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				14,315
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (shares)	12,200,000					12,200,000		12,200,000
Number of shares that remain available for future issuance (shares)	8,300,000					8,300,000		8,300,000
2013 Plan \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $					$ 0.2
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)					9,531