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Effect of Increase in Cost of Insurance and Claims (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 26, 2015 | Jun. 27, 2015 | Mar. 28, 2015 | Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income | $ 63,765 |  | $ 58,461 |  | $ 53,093 |  | $ 47,932 |  | $ 62,648 |  | $ 63,980 |  | $ 66,033 |  | $ 49,045 |  | $ 223,251 | $ 241,706 | $ 224,372
Net income | $ 39,574 |  | $ 36,278 |  | $ 32,314 |  | $ 29,184 |  | $ 37,855 |  | $ 39,348 |  | $ 40,471 |  | $ 30,015 |  | $ 137,350 | $ 147,689 | $ 138,809
Earnings per share | $ 0.95 | [1] | $ 0.86 | [1] | $ 0.77 | [1] | $ 0.69 | [1] | $ 0.89 | [1] | $ 0.91 | [1] | $ 0.92 | [1] | $ 0.67 | [1] | $ 3.26 | $ 3.38 | $ 3.09
Diluted earnings per share | $ 0.94 | [1] | $ 0.86 | [1] | $ 0.76 | [1] | $ 0.69 | [1] | $ 0.88 | [1] | $ 0.90 | [1] | $ 0.92 | [1] | $ 0.67 | [1] | $ 3.25 | $ 3.37 | $ 3.07
Development of Prior Year Self Insured Claims Estimates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,079 | $ 4,852 | $ 6,664
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 667 | $ 2,999 | $ 4,118
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.02 | $ 0.07 | $ 0.09
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.02 | $ 0.07 | $ 0.09
[1] | Due to the changes in the number of average common shares and common stock equivalents outstanding during the year, the sum of earnings per share amounts for each quarter do not necessarily sum in the aggregate to the earnings per share amounts for the full year.

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