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Effect of Increase in Cost of Insurance and Claims (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Change in Accounting Estimate [Line Items]
Operating income	$ 47,932	$ 49,045
Net income	$ 29,184	$ 30,015
Earnings per share	$ 0.69	$ 0.67
Diluted earnings per share	$ 0.69	$ 0.67
Development of Prior Year Self Insured Claims Estimates
Change in Accounting Estimate [Line Items]
Operating income	$ 2,078	$ 4,641
Net income	$ 1,284	$ 2,868
Earnings per share	$ 0.03	$ 0.06
Diluted earnings per share	$ 0.03	$ 0.06

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.