Commitments and Contingencies - Summary of Warranty Accrual Included in Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 3,532	$ 3,228	$ 3,606	$ 4,292
Transfer to Aurora as part of the sale of discontinued operations	0	0	0	(939)
Accrual for current period warranties	2,028	1,991	5,383	5,333
Warranty costs incurred	(1,629)	(1,705)	(5,058)	(5,172)
Balance at end of period	$ 3,931	$ 3,514	$ 3,931	$ 3,514