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Other Current Liabilities - Schedule of Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Customer-related liabilities $ 15,754 $ 16,439
Accrued interest payable 2,512 2,333
Accrued sales commissions 1,814 1,637
Other 9,560 8,578
Other current liabilities $ 29,640 $ 28,987