Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013	Dec. 31, 2013
Income Taxes [Line Items]
Income tax expense (benefit)	$ 2,347,000	$ (86,000)	$ 7,685,000	$ 783,000
Effective income tax rate	47.20%	(1.90%)	35.90%	5.40%
Unrecognized tax benefits, reductions			900,000
Unrecognized tax benefits	2,600,000		2,600,000		2,600,000
Expected reduction in unrecognized tax benefits	400,000		400,000
Federal Research and Development
Income Taxes [Line Items]
Income tax expense (benefit)				2,000,000
Research Tax Credit Carryforward
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount		$ 700,000		$ 3,700,000