Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Income Tax Disclosure [Line Items]
Federal, Current	$ 74,289	$ 68,722	$ 53,089
State, Current	9,550	7,031	4,643
Canadian, Current	437	1,199	683
Total current	84,276	76,952	58,415
Federal, Deferred	6,524	5,234	5,758
State, Deferred	268	200	284
Total deferred	6,792	5,434	6,042
Income taxes	$ 91,068	$ 82,386	$ 64,457