XML 49 R95.htm IDEA: XBRL DOCUMENT v3.20.1
Restricted Unit Awards - Additional Information (Details) - Restricted Unit Awards [Member] - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Unrecognized compensation expense related to non-vested RUAs granted $ 1,400,000  
Remaining compensation expense expected to be recognized over a weighted-average period 1 year 7 months 6 days  
Intrinsic value of unvested RUAs $ 1,500,000  
General and Administrative Expenses [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Compensation expense $ 39,000 $ 184,000
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  
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