Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Income Taxes [Line Items]
Effective income tax rate	40.20%	34.40%	40.70%	36.20%
Increase to valuation allowance related to tax benefits		$ 1,500