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Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities, Current [Abstract]    
Accrued wages, bonuses and commissions $ 40,100 $ 43,688
Other accrued liabilities 26,380 20,987
Accrued liabilities $ 66,480 $ 64,675