Accrued Warranty (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Accrued Warranty [Line Items]
Balance at beginning of the year	$ 3,035	$ 3,174
Provision charged to cost of goods sold	2,463	2,440
Use of provision	(2,781)	(2,579)
Foreign currency exchange rate changes	60
Balance at end of year	$ 2,777	$ 3,035