Significant Components of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Current:
Federal	$ 35,390	$ 42,391	$ 30,595
State	6,108	7,403	8,262
Total current	41,498	49,794	38,857
Deferred:
Federal	7,666	6,279	15,407
State	608	523	587
Total deferred	8,274	6,802	15,994
Total provision for income taxes	$ 49,772	$ 56,596	$ 54,851