Effect of Increase in Cost of Insurance and Claims (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Change in Accounting Estimate [Line Items]
Operating income	$ 241,706	$ 224,372	$ 176,590
Income from continuing operations	$ 147,689	$ 138,809	$ 108,922
Earnings per share from continuing operations	$ 3.38	$ 3.09	$ 2.37
Diluted earnings per share from continuing operations	$ 3.37	$ 3.07	$ 2.36
Development of Prior Year Self Insured Claims Estimates
Change in Accounting Estimate [Line Items]
Operating income	$ 4,852	$ 6,664	$ 10,909
Income from continuing operations	$ 2,999	$ 4,118	$ 6,742
Earnings per share from continuing operations	$ 0.07	$ 0.09	$ 0.15
Diluted earnings per share from continuing operations	$ 0.07	$ 0.09	$ 0.15