SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - INVENTORY RESERVE (Detail) - Inventory Valuation Reserve - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 36,358	$ 36,516	$ 33,874
Additions Charged to Income	10,520	14,279	19,741
Inventory Write-offs	(12,703)	(13,008)	(15,818)
Translation and Other	1,433	(1,429)	(1,281)
Balance at End of Year	35,608	36,358	36,516
Raw material
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	6,555	7,577	6,891
Additions Charged to Income	1,552	1,446	4,102
Inventory Write-offs	(2,317)	(1,645)	(1,611)
Translation and Other	303	(823)	(1,805)
Balance at End of Year	6,093	6,555	7,577
Work-in-process
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	2,853	3,139	509
Additions Charged to Income	306	(76)	579
Inventory Write-offs	(127)	(213)	(554)
Translation and Other	57	3	2,605
Balance at End of Year	3,089	2,853	3,139
Finished goods
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	26,950	25,800	26,474
Additions Charged to Income	8,662	12,909	15,060
Inventory Write-offs	(10,259)	(11,150)	(13,653)
Translation and Other	1,073	(609)	(2,081)
Balance at End of Year	$ 26,426	$ 26,950	$ 25,800