Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Customer incentives	$ 7,307	$ 7,165
Accrued interest	1,010	442
Other	5,745	5,059
Total other current liabilities	$ 14,062	$ 12,666