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Accrued Liabilities - Composition of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Accrued payroll and benefits $ 58,877 $ 66,575
Accrued customer rebates 16,729 18,553
Other accrued liabilities 17,170 25,667
Total accrued liabilities $ 92,776 $ 110,795