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Inventories - Composition of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 148,320 $ 163,617
Raw materials 54,983 67,911
Total inventories [1] $ 203,303 $ 231,528
[1] The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.