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Share Incentive and Other Compensation - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unit based compensation |  |  | $ 9,780,000 | $ 8,551,000 |
Trustee fees |  |  | $ 1,200,000 | 1,000,000.0 |
Weighted average grant date fair value, grants (in dollars per share) |  |  | $ 19.50 |  | $ 18.86
Total unrecognized compensation cost related to nonvested awards | $ 19,400,000 |  | $ 19,400,000 |  |
Weighted-average period over which cost is expected to be recognized |  |  | 1 year 6 months |  |
Performance Period Ending December 31, 2021 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
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 |  |  | $ 7,500,000 |  | $ 7,600,000
LTIP Units | Trustee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures |  |  | 30,321 |  |
LTIP Units | Performance Period Ending December 31, 2021 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
Restricted shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total fair value of shares that vested |  |  | $ 700,000 |  | 500,000
Restricted shares | Trustee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issued during period, share-based compensation, net of forfeitures |  |  | 30,592 |  |
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 |  |  | $ 12,600,000 |  | $ 10,400,000
LTIP Units and Restricted Stock | Trustee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
Vesting rate of shares granted to trustees |  |  | 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 | $ 2,300,000 | $ 2,100,000 | $ 7,100,000 | 6,300,000 |
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 |  |  | $ 300,000 | $ 300,000 |
Share Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares authorized | 1,917,304 |  | 1,917,304 |  |
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 |  |  | 635,976 |  | 396,149
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 |  |  | 11,244 |  | 13,766
Performance Shares 2019 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance period |  |  | 3 years |  | 3 years
Performance Shares 2019 | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Volatility rate |  |  | 21.00% |  |
Risk-free interest rates |  |  | 1.40% |  |
Performance Shares 2019 | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Volatility rate |  |  | 48.00% |  |
Risk-free interest rates |  |  | 0.20% |  |
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 |  |  | 23.10% |  |
Awards in connection with fund to have intrinsic value | $ 0 |  | $ 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 |  |  | 8.40% |  |
Awards in connection with fund to have intrinsic value | $ 0 |  | $ 0 |  | 0
Compensation expense |  |  | $ 0 |  | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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