Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2015	Sep. 26, 2014	Oct. 02, 2015	Sep. 26, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense – cost of revenue	$ 1,175	$ 1,614	$ 3,468	$ 4,529
Amortization expense – operating expenses	1,852	2,843	5,593	7,463
Total amortization expense	$ 3,027	$ 4,457	$ 9,061	$ 11,992