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Other Financial Statement Information - Inventories - Net (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 45,419 $ 43,041
Work-in-process 9,370 8,818
Finished Goods 42,477 42,163
Inventory, gross 97,266 94,022
Excess of current cost over LIFO cost (4,729) (4,474)
Noncurrent portion of inventory (4,980) (4,289)
Inventories - net $ 87,557 $ 85,259