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Restricted Unit Awards - Additional Information (Details) - Restricted Unit Awards [Member] - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Unvested restricted units fully vested   154,386 618,487
Unrecognized compensation expense related to non-vested RUAs granted $ 412,000 $ 412,000  
Remaining compensation expense expected to be recognized over a weighted-average period   1 year 4 months 24 days  
Intrinsic value of unvested RUAs   $ 564,000  
General and Administrative Expenses [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense   $ 1,000,000.0 $ 3,600,000
Greystone Manager [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Unvested restricted units fully vested 50,000    
Greystone Manager [Member] | Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Approved grant of restricted units and other awards to employees 3,000,000.0 3,000,000.0  
RUAs granted with vesting range   3 years  
Greystone Manager [Member] | Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
RUAs granted with vesting range   3 months