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Quarterly Financial Data (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
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 892,829 |  | $ 787,938 |  | $ 775,223 |  | $ 711,644 |  | $ 848,602 |  | $ 841,726 |  | $ 868,383 |  | $ 762,380 |  | $ 3,167,634 | $ 3,321,091 | $ 3,184,790
Operating income | 63,765 |  | 58,461 |  | 53,093 |  | 47,932 |  | 62,648 |  | 63,980 |  | 66,033 |  | 49,045 |  | 223,251 | 241,706 | 224,372
Income before income taxes | 62,696 |  | 57,513 |  | 52,205 |  | 47,043 |  | 61,907 |  | 63,266 |  | 65,320 |  | 48,264 |  | 219,457 | 238,757 | 221,195
Income taxes | 23,122 |  | 21,235 |  | 19,891 |  | 17,859 |  | 24,052 |  | 23,918 |  | 24,849 |  | 18,249 |  | 82,107 | 91,068 | 82,386
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 common 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
Dividends per common share | $ 0.09 |  | $ 0.09 |  | $ 0.08 |  | $ 0.08 |  | $ 0.08 |  | $ 0.08 |  | $ 0.07 |  | $ 0.07 |  | $ 0.34 | $ 0.30 | $ 1.26
[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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