Accrued Warranty (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013
Accrued Warranty [Line Items]
Balance at beginning of the period	$ 3,315	$ 2,204
Provision charged to cost of sales	976	791
Acquisition related warranty accrual	90	998
Use of provision	(973)	(755)
Foreign currency exchange rate changes	8	(47)
Balance at end of period	$ 3,416	$ 3,191