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DEBT - Additional Information (Detail)
1 Months Ended 9 Months Ended 12 Months Ended
Apr. 22, 2020
USD ($)
Apr. 20, 2020
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]              
Increase in debt discount as a result of modification of Convertible Notes $ 18,600,000            
Letter of Credit              
Debt Instrument [Line Items]              
Aggregate principal amount $ 30,000,000.0            
Convertible notes              
Debt Instrument [Line Items]              
Debt discount recorded         $ 17,930,000   $ 2,691,000
Transaction costs related to the issuance of Notes         5,869,000   $ 4,135,000
Line of Credit              
Debt Instrument [Line Items]              
Debt discount recorded         23,971,000    
Transaction costs related to the issuance of Notes         $ 22,237,000    
Convertible Senior Notes At 5.75%, Maturing 2021              
Debt Instrument [Line Items]              
Consent fees related to indenture   $ 3,400,000          
Convertible Senior Notes At 5.75%, Maturing 2021 | Convertible notes              
Debt Instrument [Line Items]              
Aggregate principal amount     $ 300,000,000.0 $ 300,000,000.0   $ 300,000,000.0  
Repurchase price of notes (in percent)         100.00%    
Effective interest rate         9.90%    
Debt interest rate     5.75% 5.75%   5.75%  
Debt issuance discount           98.00%  
Net proceeds from the Notes     $ 284,800,000        
Debt discount recorded     6,000,000.0 $ 6,000,000.0   $ 6,000,000.0  
Transaction costs related to the issuance of Notes     $ 9,200,000 $ 9,200,000   $ 9,200,000  
Conversion ratio       0.0238095      
Conversion price (USD per share) | $ / shares     $ 42.00 $ 42.00   $ 42.00  
Senior Secured First lien Term Loan B Facility              
Debt Instrument [Line Items]              
Term 7 years            
Aggregate principal amount $ 1,004,700,000.0000            
Repurchase price of notes (in percent) 97.50%            
Quarterly principal payment (in percent) 0.25%            
Effective interest rate         5.30%    
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Term 5 years            
Aggregate principal amount $ 150,000,000.0            
Available at closing         $ 50,000,000.0    
Commitment fee on undrawn amounts (in percent) 0.50%            
Line of Credit | Revolving Credit Facility | Maximum | LIBOR              
Debt Instrument [Line Items]              
Variable interest rate 4.25%            
Line of Credit | Revolving Credit Facility | Minimum | LIBOR              
Debt Instrument [Line Items]              
Variable interest rate 0.00%