Inventories, net (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 38,456	$ 46,282
Work in progress	53,427	54,171
Finished goods	209,291	175,629
Inventory, gross, Total	301,174	276,082
Less: allowance for slow moving and excess inventory	(82,167)	(71,020)
Total inventory	$ 219,007	$ 205,062