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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 |

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