Warranty - Summary of Accrued Warranty Obligation (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Product Warranties Disclosures [Abstract]
Balance at the beginning of the year	$ 4,252	$ 4,613
Warranty expense	5,417	4,667
Warranty payments	(5,520)	(5,222)
Balance at the end of the period	$ 4,149	$ 4,058