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REVENUES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Unitholders' capital $ 62,579   $ 62,579     $ 80,128
Revenues 213,283 $ 634,055 550,604 $ 923,640    
Management fees            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 178,096 180,028 363,511 360,956    
Closed-end            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 31,880 449,708 $ 183,786 558,365    
Percentage of fund profits     20.00%      
Preferred return     8.00%      
Evergreen            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 3,307 4,319 $ 3,307 4,319    
Percentage of fund profits     20.00%      
Incentive income            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Revenues 35,187 $ 454,027 $ 187,093 $ 562,684    
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 2,500   6,700      
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 $ (100)   $ (47,000)