Accrued Warranty (Detail) - Table (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Balance at beginning of period	$ 645	$ 466
Accrued warranty expense	273	110
Warranty claims paid	(297)	(141)
Translation adjustment	(2)	12
Balance at end of period	$ 619	$ 447