Other Current Liabilities - Schedule of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Customer-related liabilities	$ 17,830	$ 18,512
Accrued interest payable	2,863	2,697
Accrued sales commissions	2,348	2,301
Other	11,535	13,579
Other current liabilities	$ 34,576	$ 37,089