Number of Vesting Installments

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- 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)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (i)
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- 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

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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- 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

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

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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ 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 (d)(2)
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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

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

+ References

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

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- 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

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

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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

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- 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 S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section D
-Subsection 2

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Capital - Incentive and Share-based Compensation (Details) $ / shares in Units, $ in Thousands			1 Months Ended						3 Months Ended	4 Months Ended	12 Months Ended
	Apr. 30, 2014 USD ($) shares	Oct. 07, 2013 USD ($) vesting_installment shares	Jun. 30, 2015 USD ($) shares	Feb. 28, 2015 USD ($) vesting_installment shares	Jan. 31, 2015 USD ($) shares	Oct. 31, 2014 USD ($) vesting_installment tranche shares	Jun. 30, 2014 USD ($) shares	Jan. 31, 2014 USD ($) vesting_installment shares	Dec. 31, 2013 USD ($)	Apr. 30, 2014 USD ($) shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares	Dec. 31, 2013 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average per unit or share fair value (in dollars per share) \| $ / shares											$ 18.11
Fair value of share-based awards granted in period											$ 100
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest									10 years
Expected volatility rate look-back period (in years)		6 years
Share-based compensation arrangement by share-based payment award, equity instrument other than options, forfeitures rate											0.05
Age of grantee at which LTIP unit and restricted stock awards immediately vest									60 years
Awards that Meet Age and Service Requirements for Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncash share-based compensation expense recognized									$ 2,300		$ 500	$ 200
Unrecognized compensation expense											$ 100
Unrecognized compensation expense, period for recognition (in years)											1 year 2 months 12 days
Awards that Do Not Meet Age and Service Requirements for Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncash share-based compensation expense recognized									$ 700		$ 5,000	$ 3,500
Unrecognized compensation expense											$ 10,300
Unrecognized compensation expense, period for recognition (in years)											2 years 3 months 18 days
Long-Term Incentive Plan Units and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average per unit or share fair value (in dollars per share) \| $ / shares												$ 10.65
Fair value of share-based awards granted in period											$ 6,600	$ 5,400
Expected term												3 years
Risk free interest rate												0.66%
Expected volatility rate												28.00%
Fair value vested in period											$ 3,500	$ 3,000
Long-Term Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares											461,180
Time Based Long-Tern Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares		193,059		33,398
Fair value of share-based awards granted in period		$ 3,900		$ 800
Award vesting period (in years)				4 years
Number of vesting installments \| vesting_installment				3
Performance Based Long-Term Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares		64,352		33,398
Fair value of share-based awards granted in period		$ 600		$ 400
Award vesting period (in years)				3 years
Number of vesting installments \| vesting_installment				2
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares											30,020
Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares		39,706		14,315		1,571
Fair value of share-based awards granted in period						$ 10
Time Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares		119,146		14,315		1,571
Fair value of share-based awards granted in period						$ 20
Long-Term Incentive Plan Unit and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average per unit or share fair value (in dollars per share) \| $ / shares											$ 13.36		$ 10.89
Fair value of share-based awards granted in period													$ 11,700
Expected term												3 years
Risk free interest rate												0.80%
Expected volatility rate												26.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate											1.90%	2.60%
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instrument other than options, forfeitures rate											0
Director [Member] \| Time Based Long-Tern Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares		69,228					32,196
Fair value of share-based awards granted in period		$ 900					$ 500
Award vesting period (in years)							3 years
Number of vesting installments \| vesting_installment		3
Director [Member] \| Time Based Long-Tern Incentive Plan Unit [Member] \| 2013 Plan Units Vesting February 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares			35,082
Fair value of share-based awards granted in period			$ 600
Award vesting period (in years)			3 years
Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instrument other than options, forfeitures rate											0
Executive Officer [Member] \| Time Based Long-Tern Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares		440,192						180,260
Fair value of share-based awards granted in period		$ 5,400						$ 2,500
Award vesting period (in years)		3 years				4 years
Number of vesting installments \| vesting_installment		4				3		3
Executive Officer [Member] \| Time Based Long-Tern Incentive Plan Unit [Member] \| 2013 Plan Units Vesting February 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares				13,736
Fair value of share-based awards granted in period				$ 200
Award vesting period (in years)				4 years
Number of vesting installments \| vesting_installment				3
Executive Officer [Member] \| Time Based Long-Tern Incentive Plan Unit [Member] \| 2013 Plan Units Vesting January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares				168,033
Fair value of share-based awards granted in period				$ 2,900
Award vesting period (in years)				4 years
Number of vesting installments \| vesting_installment				3
Executive Officer [Member] \| Performance Based Long-Term Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares		146,730						180,263
Fair value of share-based awards granted in period		$ 900						$ 900
Award vesting period (in years)		3 years				3 years
Number of vesting installments		2				2
Executive Officer [Member] \| Performance Based Long-Term Incentive Plan Unit [Member] \| 2013 Plan Units Vesting February 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares				13,736
Fair value of share-based awards granted in period				$ 100
Award vesting period (in years)				3 years
Number of vesting installments \| vesting_installment				2
Executive Officer [Member] \| Performance Based Long-Term Incentive Plan Unit [Member] \| 2013 Plan Units Vesting January 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares				154,266
Fair value of share-based awards granted in period				$ 1,300
Award vesting period (in years)				3 years
Number of vesting installments \| vesting_installment				2
Employee [Member] \| Time Based Long-Tern Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares					9,531					23,487
Fair value of share-based awards granted in period					$ 200					$ 400
Employee [Member] \| Performance Based Long-Term Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares										23,484
Fair value of share-based awards granted in period										$ 200
ESRT [Member] \| Employee [Member] \| Performance Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares										7,059
ESRT [Member] \| Employee [Member] \| Time Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares										7,061
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares) \| shares											12,200,000
Number of shares that remain available for future issuance (in shares) \| shares											10,200,000
2013 Plan [Member] \| Time Based Long-Tern Incentive Plan Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares	48,923
Fair value of share-based awards granted in period	$ 700
2013 Plan [Member] \| Time Based Long-Tern Incentive Plan Unit [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	30.00%
2013 Plan [Member] \| Time Based Long-Tern Incentive Plan Unit [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	4 years
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	30.00%
2013 Plan [Member] \| Time Based Long-Tern Incentive Plan Unit [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	5 years
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	40.00%
Maximum [Member] \| Long-Term Incentive Plan Unit and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term											3 years
Risk free interest rate											1.00%
Expected volatility rate											29.00%
Minimum [Member] \| Long-Term Incentive Plan Unit and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term											2 years 10 months 24 days
Risk free interest rate											0.80%
Expected volatility rate											24.00%