Accrued Warranty (Detail) - Table (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Balance at beginning of period	$ 645	$ 466
Accrued warranty expense	588	237
Warranty claims paid	(658)	(209)
Translation adjustment	21	(16)
Balance at end of period	$ 596	$ 478