Inventories - Composition of Inventories (Detail) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished products		$ 139,785	$ 163,617
Raw materials		63,862	67,911
Total inventories	[1]	$ 203,647	$ 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.