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Share Incentive and Other Compensation - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unit based compensation $ 4,511,000 $ 3,819,000    
Trustee fees 400,000 300,000    
Total unrecognized compensation cost related to nonvested awards $ 23,500,000      
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 $ 7,100,000   $ 7,600,000  
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      
Restricted shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of shares that vested $ 200,000   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 1,242      
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 $ 12,500,000   $ 10,400,000  
Weighted average grant date fair value, grants (in dollars per share) $ 19.40   $ 18.86  
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 $ 2,700,000 2,400,000    
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 $ 100,000    
Share Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 1,975,780      
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 633,462   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 11,119   13,766  
Performance Shares 2019        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance period 3 years   3 years  
Volatility rate 48.00%   21.00%  
Risk-free interest rates 0.20%   1.40%  
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]        
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  
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  
Compensation expense $ 0   $ 0