Debt - Outstanding Debt Obligations (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 218,278	$ 243,817
Less: debt discount, net of accretion	(7,100)	(9,062)
Total debt, net of unaccreted discount	211,178	234,755
Less current portion of long-term debt	(708)	(3,187)
Total long-term debt, net of unaccreted discount	210,470	231,568
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	118,836	145,152
Convertible Notes [Member]
Debt Instrument [Line Items]
Total debt	85,000	85,000
Mortgages [Member]
Debt Instrument [Line Items]
Total debt	13,662	10,333
Equipment and Working Capital Notes [Member]
Debt Instrument [Line Items]
Total debt	347	2,832
Capital Leases [Member]
Debt Instrument [Line Items]
Total debt	$ 433	$ 500