Accrued Warranty (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2012	Sep. 30, 2011
Accrued Warranty [Line Items]
Balance at beginning of the period	$ 3,035	$ 3,174
Provision charged to cost of goods sold	1,958	1,787
Use of provision	(2,191)	(1,927)
Foreign currency exchange rate changes	50	15
Balance at end of period	$ 2,852	$ 3,049