Effect of Increase in Cost of Insurance and Claims (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Change in Accounting Estimate [Line Items]
Operating income	$ 58,572	$ 48,427	$ 103,586	$ 90,235
Income from continuing operations	35,925	29,492	63,563	55,243
Earnings per share from continuing operations	$ 0.80	$ 0.64	$ 1.41	$ 1.19
Diluted earnings per share from continuing operations	$ 0.80	$ 0.64	$ 1.40	$ 1.19
Development of Prior Year Self Insured Claims Estimates
Change in Accounting Estimate [Line Items]
Operating income	4,856	2,282	6,747	4,644
Income from continuing operations	$ 3,001	$ 1,410	$ 4,170	$ 2,870
Earnings per share from continuing operations	$ 0.07	$ 0.03	$ 0.09	$ 0.06
Diluted earnings per share from continuing operations	$ 0.07	$ 0.03	$ 0.09	$ 0.06

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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

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- Definition

The amount of net income (loss) derived from continuing operations during 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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