Inventories - Changes in Inventory Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Beginning balance	$ (7,177)	$ (16,033)	$ (47,488)
Change in reserve
Inventory reserve charged to costs of sales	(4,789)	(7,646)	(13,635)
Sale of previously reserved inventory	3,784	4,985	13,932
Change in reserve	(1,005)	(2,661)	297
Write off	2,620	11,384	29,146
Translation adjustments	(829)	133	2,012
Ending balance	$ (6,391)	$ (7,177)	$ (16,033)