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Related Party Transaction (Textual) (Detail) - USD ($)			12 Months Ended
	Sep. 22, 2016	Jun. 21, 2016	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Jul. 14, 2016	Jun. 30, 2016	Jun. 15, 2016	Jun. 14, 2016
Related Party Transaction [Line Items]
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%		0.50%
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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