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REVENUES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Unitholders' capital $ 76,203   $ 76,203     $ 80,128
Revenues 241,227 $ 235,032 791,831 $ 1,158,672    
Management fees            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 175,195 181,312 538,706 542,268    
Closed-end            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 65,661 53,537 $ 249,447 611,902    
Percentage of fund profits     20.00%      
Preferred return     8.00%      
Evergreen            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 371 183 $ 3,678 4,502    
Percentage of fund profits     20.00%      
Incentive income            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 66,032 $ 53,720 $ 253,125 $ 616,404    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Unitholders' capital         $ 48,700  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Management fees            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 2,800   9,500      
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 | Incentive income            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues $ (4,900)   $ (52,000)