Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013	Dec. 31, 2013
Income Taxes [Line Items]
Income tax expense (benefit)	$ 3,109,000	$ 2,097,000	$ 5,338,000	$ 869,000
Effective income tax rate	32.50%	27.60%	32.50%	8.60%
Unrecognized tax benefits	2,700,000		2,700,000		2,600,000
Unrecognized tax benefits, reductions			200,000
Federal Research and Development
Income Taxes [Line Items]
Income tax expense (benefit)				(2,000,000)
Research Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount		$ 500,000		$ 3,000,000