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Effect of Increase in Cost of Insurance and Claims (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Change in Accounting Estimate [Line Items]
Operating income	$ 49,045us-gaap_OperatingIncomeLoss	$ 45,014us-gaap_OperatingIncomeLoss
Net income	30,015us-gaap_NetIncomeLoss	27,638us-gaap_NetIncomeLoss
Earnings per share	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.61us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.61us-gaap_EarningsPerShareDiluted
Development of Prior Year Self Insured Claims Estimates
Change in Accounting Estimate [Line Items]
Operating income	4,641	1,891
Net income	$ 2,868	$ 1,169
Earnings per share	$ 0.06	$ 0.03
Diluted earnings per share	$ 0.06	$ 0.03

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

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

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

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