Commitments and Contingencies - Summary of Warranty Accrual Included in Accrued Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2015	Jun. 27, 2014	Jul. 03, 2015	Jun. 27, 2014
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 4,091	$ 3,659	$ 4,242	$ 3,606
Accrual for current period warranties	1,438	1,606	3,033	3,355
Warranty costs incurred	(1,362)	(1,733)	(3,108)	(3,429)
Balance at end of period	$ 4,167	$ 3,532	$ 4,167	$ 3,532