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EARNINGS PER UNIT - Computations of Net Income Per Unit Additional information (Detail)
12 Months Ended
Dec. 31, 2019
shares
Dec. 31, 2018
shares
OCGH Units    
Earnings Per Share [Line Items]    
Potential exchangeable units ratio 1  
Class A Units    
Earnings Per Share [Line Items]    
Potential exchangeable units ratio 1  
Deferred equity unit    
Earnings Per Share [Line Items]    
Potential exchangeable units ratio 1  
Units vesting periods 10 years  
Deferred equity unit | OCGH Units    
Earnings Per Share [Line Items]    
Units vesting periods 10 years  
Deferred equity unit    
Earnings Per Share [Line Items]    
Issuable shares (in shares) 0 0
Minimum | Deferred equity unit | OCGH Units    
Earnings Per Share [Line Items]    
Units vesting periods 4 years  
Maximum | Deferred equity unit | OCGH Units    
Earnings Per Share [Line Items]    
Units vesting periods 10 years