Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Income Tax Disclosure [Line Items]
Federal, Current									$ 68,548	$ 74,289	$ 68,722
State, Current									6,668	9,550	7,031
Canadian, Current									563	437	1,199
Total current									75,779	84,276	76,952
Federal, Deferred									6,104	6,524	5,234
State, Deferred									224	268	200
Total deferred									6,328	6,792	5,434
Income taxes	$ 23,122	$ 21,235	$ 19,891	$ 17,859	$ 24,052	$ 23,918	$ 24,849	$ 18,249	$ 82,107	$ 91,068	$ 82,386