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Related Party Transaction (Textual) (Detail) - USD ($) |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 22, 2016 | Jun. 21, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2017 | Jul. 14, 2016 | Jun. 30, 2016 | Jun. 15, 2016 | Jun. 14, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 118,751,000 | $ 603,770,000 | $ 202,165,000 |  |  |  |  |
Percentage ownership of Par common stock |  |  | 10.00% |  |  |  |  |  |  |
Bridge Loan |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Deferred finance costs, net | $ 3,000,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount | 3,100,000 |  |  |  |  |  | $ 52,600,000 |  |  |
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 |  |  |  |  |  |  |
Rights Offering | Bridge Loan |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 49,000,000 |  |  |  |  |  |  |  |  |
Common Stock | Rights Offering | Bridge Loan |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares converted (in shares) | 272,733 |  |  |  |  |  |  |  |  |
EGI | Affiliated Entity | Bridge Loan |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Line credit maximum borrowing amount |  |  |  |  |  |  |  |  |  | $ 52,632,000.000
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 5.00%
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] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 115,000,000 |  |
Debt instrument, interest rate |  |  | 5.00% |  | 5.00% |  |  |  |  |
5% Convertible Senior Notes due 2021 | Convertible Debt | Whitebox Advisors, LLC | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 47,500,000.0 |  |  |  |
Line credit maximum borrowing amount |  |  |  |  |  |  |  | 32,500,000.0 |  |
5% Convertible Senior Notes due 2021 | Convertible Debt | Highbridge | Affiliated Entity |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 40,400,000.0 |  |  |  |
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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