SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - INVENTORY RESERVE (Detail) - Inventory Valuation Reserve - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 35,608	$ 36,358	$ 36,516
Additions Charged to Income	20,025	10,520	14,279
Inventory Write-offs	(20,386)	(12,703)	(13,008)
Translation and Other	(373)	1,433	(1,429)
Balance at End of Year	34,874	35,608	36,358
Raw material
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	6,093	6,555	7,577
Additions Charged to Income	4,028	1,552	1,446
Inventory Write-offs	(1,899)	(2,317)	(1,645)
Translation and Other	348	303	(823)
Balance at End of Year	8,570	6,093	6,555
Work-in-process
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	3,089	2,853	3,139
Additions Charged to Income	702	306	(76)
Inventory Write-offs	(1,097)	(127)	(213)
Translation and Other	60	57	3
Balance at End of Year	2,754	3,089	2,853
Finished goods
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	26,426	26,950	25,800
Additions Charged to Income	15,295	8,662	12,909
Inventory Write-offs	(17,390)	(10,259)	(11,150)
Translation and Other	(781)	1,073	(609)
Balance at End of Year	$ 23,550	$ 26,426	$ 26,950