Inventories, net (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 41,137	$ 46,282
Work in progress	51,897	54,171
Finished goods	186,897	175,629
Inventory, gross, Total	279,931	276,082
Less: allowance for slow moving and excess inventory	(82,896)	(71,020)
Total inventory	$ 197,035	$ 205,062