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Related Party Transaction (Detail) - USD ($)
12 Months Ended
Jun. 21, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Jun. 15, 2016
Related Party Transaction [Line Items]              
Repayments of debt   $ 241,336,000 $ 118,751,000 $ 603,770,000      
Percentage ownership of par common stock   10.00%          
Investor              
Related Party Transaction [Line Items]              
Travel and out of pocket expenses   $ 50,000          
Initial term of service agreements   1 year          
Renewal term for service agreements   1 year          
Termination period between extension date   60 days          
Equity Group Investments | Investor              
Related Party Transaction [Line Items]              
Related party transaction, expenses from transactions with related party   $ 0 $ 0 $ 0      
Tranche B Term Loan | Term Loan              
Related Party Transaction [Line Items]              
Deferred finance costs, net             $ 2,500,000
Repayments of debt $ 5,000,000            
Tranche B Term Loan | Term Loan | Investor              
Related Party Transaction [Line Items]              
Deferred finance costs, net             2,500,000
Tranche B Term Loan | Term Loan | Whitebox Advisors, LLC              
Related Party Transaction [Line Items]              
Deferred finance costs, net             $ 1,300,000
Repayments of debt $ 3,300,000            
5% Convertible Senior Notes due 2021              
Related Party Transaction [Line Items]              
Debt instrument, interest rate   5.00%       5.00%  
5% Convertible Senior Notes due 2021 | Convertible Debt              
Related Party Transaction [Line Items]              
Debt instrument, interest rate   5.00%          
Aggregate principal amount           $ 115,000,000  
5% Convertible Senior Notes due 2021 | Convertible Debt | Whitebox Advisors, LLC | Affiliated Entity              
Related Party Transaction [Line Items]              
Aggregate principal amount         $ 47,500,000    
Line credit maximum borrowing amount           32,500,000  
5% Convertible Senior Notes due 2021 | Convertible Debt | Highbridge | Affiliated Entity              
Related Party Transaction [Line Items]              
Aggregate principal amount         $ 40,400,000    
Senior Unsecured Convertible Notes due 2021 | Convertible Debt | Whitebox Advisors, LLC | Affiliated Entity              
Related Party Transaction [Line Items]              
Line credit maximum borrowing amount           $ 100,000,000