Accrued Warranty (Detail) - Table (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Balance at beginning of period	$ 665	$ 645
Accrued warranty expense	199	217
Warranty claims paid	(19)	(123)
Translation adjustment	(21)	18
Balance at end of period	$ 824	$ 757