Long-Term Debt - Outstanding Debt Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 372,394	$ 243,817
Less: debt discount, net of accretion	(2,735)	(9,062)
Total debt, net of unaccreted discount	369,659	234,755
Less current portion of long-term debt	(43,690)	(3,187)
Total long-term debt, net of unaccreted discount	325,969	231,568
2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	313,620	145,152
Convertible Notes [Member]
Debt Instrument [Line Items]
Total debt	45,656	85,000
Mortgages and Other [Member]
Debt Instrument [Line Items]
Total debt	12,755	10,333
Equipment and working capital notes [Member]
Debt Instrument [Line Items]
Total debt		2,832
Capital Leases [Member]
Debt Instrument [Line Items]
Total debt	$ 363	$ 500