Debt - Outstanding Debt Obligations (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 308,380	$ 372,394
Less: debt discount, net of accretion		(2,735)
Total debt, net of unaccreted discount	308,380	369,659
Less current portion of long-term debt	(371)	(43,690)
Total long-term debt, net of unaccreted discount	308,009	325,969
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	295,203	313,620
Convertible Notes [Member]
Debt Instrument [Line Items]
Total debt		45,656
Mortgages [Member]
Debt Instrument [Line Items]
Total debt	12,883	12,755
Capital Leases [Member]
Debt Instrument [Line Items]
Total debt	$ 294	$ 363