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Share Incentive and Other Compensation - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unit based compensation | $ 3,819,000 | $ 3,454,000 |  |
Trustee fees | 300,000 | 300,000 |  |
Total unrecognized compensation cost related to nonvested awards | $ 21,200,000 |  |  |
Weighted-average period over which cost is expected to be recognized | 1 year 8 months 12 days |  |  |
Performance Period Ending December 31, 2021 |  |  |  |
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] |  |  |  |
Total fair value of shares that vested | $ 7,200,000 |  | $ 8,500,000 |
LTIP Units | Trustee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 0 |  | 18,009 |
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date |  |  | 6,463 |
LTIP Units | Performance Period Ending December 31, 2021 |  |  |  |
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 |  |  | 11,546 |
Restricted shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of shares that vested | $ 200,000 |  | $ 600,000 |
Restricted shares | Trustee |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures | 0 |  | 17,318 |
Shares granted to trustees for trustee fees vesting on one year anniversary of grant date |  |  | 3,996 |
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 |  |  | 13,322 |
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 |  | $ 11,100,000 |
Weighted average grant date fair value, grants (in dollars per share) | $ 25.18 |  | $ 32.50 |
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 | $ 2,100,000 | $ 1,900,000 |  |
LTIP Units and Restricted Stock | Performance Period Ending December 31, 2021 |  |  |  |
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 | $ 100,000 |  |  |
Share Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized | 179,953 |  |  |
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 | 396,149 |  | 330,718 |
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 | 13,766 |  | 8,041 |
Performance Shares 2019 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period | 3 years |  |  |
Volatility rate | 21.00% |  | 19.60% |
Risk-free interest rates | 1.40% |  | 2.50% |
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] |  |  |  |
Percentage of promote awarded as share based compensation award |  |  |  | 25.00%
Compensation expense | $ 0 |  | $ 0 |
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 |  | 0 |
Compensation expense | 0 |  | 0 |
Long Term Investment Alignment Program | Fund V |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of promote awarded as share based compensation award |  |  |  | 4.30%
Awards in connection with fund to have intrinsic value | 0 |  | 0 |
Compensation expense | $ 0 |  | $ 0 |

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