Reconciliation of Changes in Inventory Reserve (Detail) - Inventory Valuation Reserve - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 4,802	$ 2,933	$ 2,185
Expense	815	2,204	779
Inventory write off	(1,060)	(154)	(6)
Adjustment due to currency translation	(249)	(181)
Balance at end of year	$ 4,308	$ 4,802	$ 2,933