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Debt - Schedule of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 27, 2018	Dec. 31, 2017	Dec. 21, 2017	Dec. 31, 2016	Jun. 30, 2016
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 416,466		$ 415,000
Less: unamortized discount and deferred financing costs	(23,826)		(30,188)
Total debt, net of unamortized debt discount	392,640		384,812
Less current maturities	(33)		0
Long-term debt, net of current maturities and unamortized discount	$ 392,607		384,812
5% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument, interest rate	5.00%					5.00%
7.75% Senior Secured Note due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate	7.75%
Convertible Debt \| 5% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 115,000		115,000
Less: unamortized discount and deferred financing costs	$ (14,600)
Debt instrument, interest rate	5.00%				5.00%
Senior Notes \| 7.75% Senior Secured Note due 2025
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 300,000		300,000	$ 300,000
Debt instrument, interest rate	7.75%			7.75%
Term Loan \| Mid Pac Term Loan
Debt Instrument [Line Items]
Principal amount of long-term debt	$ 1,466		0
Debt instrument, interest rate		4.375%
Revolving Credit Facility \| ABL Revlover
Debt Instrument [Line Items]
Principal amount of long-term debt	0		$ 0
Letters of credit outstanding	$ 13,500