Compensation expense related to acceleration of previously granted.

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Maximum percentage of promote to be awarded as share-based compensation awards. Promote is defined as the amount above a certain performance measurement threshold.

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Percentage of promote awarded as share-based compensation award.

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Share based compensation arrangement by share based payment award performance period.

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Share-based compensation, granted, for service, vesting on one year anniversary of grant date.

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Share-based compensation, granted, for service, vesting rate beginning on the first anniversary of grant date.

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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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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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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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.

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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.

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

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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.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Percentage of vesting of share-based compensation awards.

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Value, after forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Fees charged annually for the professional services of a trustee, usually quoted as a percentage of the funds being managed. The fee for appointing an offshore Trustee is included in the trust price.

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Share Incentive and Other Compensation - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit based compensation				$ 12,948,000	$ 11,155,000	$ 13,695,000
Trustee fees		$ 1,300,000	$ 1,300,000
Total unrecognized compensation cost related to nonvested awards		$ 14,100,000
Weighted-average period over which cost is expected to be recognized		1 year 7 months 6 days
Performance Period Ending December 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				33.30%
Award vesting period				3 years
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures	26,632
Compensation expense	$ 600,000
Compensation expense related to acceleration of previously granted	$ 1,700,000
Total fair value of shares that vested		$ 12,800,000			7,300,000
LTIP Units \| Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures		17,427
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date		8,949
LTIP Units \| Performance Period Ending December 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				66.70%
Award vesting period				3 years
LTIP Units \| Tranche One \| Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures		8,478
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares that vested		$ 800,000			$ 700,000
Restricted shares \| Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures		17,050
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date		5,181
Restricted shares \| Tranche One \| Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures		11,869
LTIP Units and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total value of restricted shares and LTIP units as of the grant date				$ 10,400,000
Weighted average grant date fair value, grants (in dollars per share)		$ 26.64			$ 31.69
LTIP Units and Restricted Stock \| Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Annual vesting rate of shares granted to trustees that begin vesting on the second anniversary of grant date		33.00%
LTIP Units and Restricted Stock \| General and Administrative Expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit based compensation				$ 8,400,000	$ 8,400,000
LTIP Units and Restricted Stock \| Performance Period Ending December 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
LTIP Units and Restricted Stock \| Performance Fails To Achieve, Earned Performance-Based Shares Vest At End Of Performance Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				60.00%
LTIP Units and Restricted Stock \| Performance Fails To Achieve
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				40.00%
Award vesting period				2 years
LTIP Units and Restricted Stock \| Minimum \| TSR percentile falls between the 25th percentile and the 50th percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				50.00%
LTIP Units and Restricted Stock \| Minimum \| TSR percentile falls between the 50th percentile and 75th percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				100.00%
LTIP Units and Restricted Stock \| Maximum \| TSR percentile falls between the 25th percentile and the 50th percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				100.00%
LTIP Units and Restricted Stock \| Maximum \| TSR percentile falls between the 50th percentile and 75th percentile
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				200.00%
Employee Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense				$ 300,000	$ 200,000	$ 200,000
Share Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	1,176,340			1,176,340
Share Incentive Plan \| LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures				381,821
Share Incentive Plan \| Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period, share-based compensation, net of forfeitures				5,767
Performance Shares 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period				3 years
Volatility rate				(18.00%)
Risk-free interest rates				(2.40%)
Long Term Investment Alignment Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Max percentage of future fund III promote that may be awarded to senior executives							25.00%
Long Term Investment Alignment Program \| Fund III
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 0	$ 600,000
Percentage of promote awarded as share based compensation award							25.00%
Long Term Investment Alignment Program \| Fund IV
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of promote awarded as share based compensation award							22.80%
Awards in connection with fund to have intrinsic value		$ 0