Inventories - Composition of Inventories (Detail) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Finished goods		$ 156,437	$ 163,617
Raw materials		59,841	67,911
Total inventories	[1]	$ 216,278	$ 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.