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Quarterly Operating Results (Unaudited) - Quarterly Operating Results (Unaudited) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jul. 01, 2012
Apr. 01, 2012
Dec. 31, 2011
Oct. 02, 2011
Jul. 03, 2011
Apr. 03, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effect of Fourth Quarter Events [Line Items]                      
Number of days in quarter 92 days 91 days 91 days 92 days 90 days 91 days 91 days 93 days 365 days 365 days  
Revenues $ 477,687 $ 465,234 $ 458,218 $ 439,600 $ 441,320 $ 491,811 $ 510,832 $ 438,224 $ 1,840,739 $ 1,882,187 $ 1,543,386
Gross profit 150,337 138,813 144,648 132,799 123,599 144,642 149,715 123,565 566,597 541,521 446,840
Operating income 31,603 (13,269) 53,037 37,126 28,545 46,127 53,393 37,141 108,497 165,206 116,639
Income (loss) from continuing operations 39,478 (55,686) 39,705 19,739 22,773 28,156 31,771 18,608 43,236 101,308 61,276
Income from discontinued operations, net of tax 2,428 7,125 2,685 4,536 3,754 3,047 2,954 3,282 16,774 13,037 2,336
Gain on disposal of discontinued operations, net of tax 124,697 9,783             134,480   44,847
Net income $ 166,603 $ (38,778) $ 42,390 $ 24,275 $ 26,527 $ 31,203 $ 34,725 $ 21,890 $ 194,490 $ 114,345 $ 108,459
Basic income (loss) per share                      
Continuing operations $ 0.89 $ (1.24) $ 0.87 $ 0.43 $ 0.49 $ 0.60 $ 0.67 $ 0.39 $ 0.96 $ 2.15 $ 1.31
Discontinued operations $ 0.06 $ 0.15 $ 0.06 $ 0.10 $ 0.08 $ 0.06 $ 0.06 $ 0.07 $ 0.37 $ 0.28 $ 0.05
Disposal of discontinued operations $ 2.82 $ 0.22             $ 2.98   $ 0.96
Net income $ 3.77 $ (0.87) $ 0.93 $ 0.53 $ 0.57 $ 0.66 $ 0.73 $ 0.46 $ 4.31 $ 2.43 $ 2.32
Diluted income (loss) per share                      
Continuing operations $ 0.88 $ (1.24) $ 0.86 $ 0.42 $ 0.48 $ 0.59 $ 0.66 $ 0.38 $ 0.94 $ 2.11 $ 1.28
Discontinued operations $ 0.05 $ 0.15 $ 0.06 $ 0.10 $ 0.08 $ 0.06 $ 0.06 $ 0.07 $ 0.36 $ 0.27 $ 0.05
Disposal of discontinued operations $ 2.77 $ 0.22             $ 2.93   $ 0.94
Net income $ 3.70 $ (0.87) $ 0.92 $ 0.52 $ 0.56 $ 0.65 $ 0.72 $ 0.45 $ 4.23 $ 2.38 $ 2.27