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.

+ Details

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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.

+ Details

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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.

+ Details

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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

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-Subparagraph (SAB TOPIC 14.F)

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Name Accounting Standards Codification

-Topic 718

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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.

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-Name Accounting Standards Codification

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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.

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

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- 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.

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-Paragraph 2

-Subparagraph (c)(2)(iii)(3)

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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).

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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).

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- 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.

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-Publisher FASB

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-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- 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.

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- 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.

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-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- 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.

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

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- 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.

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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

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-Publisher FASB

-Name Accounting Standards Codification

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-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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Paragraph 2

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- Definition

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

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-Name Accounting Standards Codification

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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).

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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.

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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)

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-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 Millions	1 Months Ended			3 Months Ended			9 Months Ended
	Jun. 30, 2015 USD ($) shares	Feb. 28, 2015 USD ($) vesting_installment tranche shares	Jan. 31, 2015 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares	Mar. 31, 2015 $ / shares shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($)
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 Price [Roll Forward]
Beginning balance, Unvested, Weighted Average Grant Price, per share \| $ / shares			$ 13.78		$ 13.78		$ 13.78
Vested, Weighted Average Grant Price, per share \| $ / shares							15.00
Granted, Weighted Average Grant Price, per share \| $ / shares							18.11
Forfeited, Weighted Average Grant Price, per share \| $ / shares							16.11
Ending balance, Unvested, Weighted Average Grant Price, per share \| $ / shares				$ 14.96			$ 14.96
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 Price [Roll Forward]
Noncash share-based compensation expense recognized \| $							$ 0.5	$ 0.3
Unrecognized compensation expense \| $				$ 0.2			0.2
Unrecognized compensation expense, period for recognition (in years)					1 year 4 months 24 days
Awards that Do Not Meet Age and Service Requirements for Vesting
Weighted Average Grant Price [Roll Forward]
Noncash share-based compensation expense recognized \| $				1.4		$ 0.9	3.8	$ 2.8
Unrecognized compensation expense \| $				$ 11.6			$ 11.6
Unrecognized compensation expense, period for recognition (in years)							2 years 6 months
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 \| $							$ 6.6
Expected term							3 years
Risk free interest rate							0.80%
Expected volatility rate							24.00%
Weighted Average Grant Price [Roll Forward]
Granted, Weighted Average Grant Price, per share \| $ / shares							$ 13.36
Long-Term Incentive Plan Unit [Member]
Restricted Stock and LTIP Unit Activity [Roll Forward]
Beginning balance, Unvested (in shares)			1,194,660		1,194,660		1,194,660
Vested (in shares)							(59,875)
Granted (in shares)							461,180
Forfeited (in shares)							(5,544)
Ending balance, Unvested (in shares)				1,590,421			1,590,421
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 \| $		$ 0.8
Number of Vesting Installments \| tranche		3
Award vesting period (in years)		4 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		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 \| $		$ 0.4
Number of Vesting Installments \| tranche		2
Award vesting period (in years)		3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		33,398
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term							2 years 10 months 24 days
Risk free interest rate							1.00%
Expected volatility rate							29.00%
Restricted Stock and LTIP Unit Activity [Roll Forward]
Beginning balance, Unvested (in shares)			102,296		102,296		102,296
Vested (in shares)							(7,405)
Granted (in shares)							30,020
Forfeited (in shares)							(8,977)
Ending balance, Unvested (in shares)				115,934			115,934
Long-Term Incentive Plan Unit and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend rate							1.90%
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
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
Award vesting period (in years)		4 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 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
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)				12,200,000.0			12,200,000.0
Number of shares that remain available for future issuance (shares)				10,200,000.0			10,200,000.0
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