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Quarterly Financial Data (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data [Abstract]                      
Net sales $ 889,173 $ 827,810 $ 784,010 $ 737,135 $ 809,910 $ 747,641 $ 724,872 $ 711,066 $ 3,238,128 $ 2,993,489 $ 2,797,089
Gross profit 533,220 482,625 445,507 421,576 466,361 416,555 397,608 391,193 1,882,928 1,671,717 1,515,564
Income from operations 258,089 219,349 179,746 185,177 225,242 183,257 178,784 170,304 842,361 757,587 660,539
Net earnings $ 165,703 $ 136,323 $ 111,353 $ 124,914 $ 143,530 $ 116,708 $ 114,813 $ 108,309 $ 538,293 $ 483,360 $ 427,247
Earnings from continuing operations per common share:                      
Basic (in dollars per share) $ 1.67 $ 1.37 $ 1.12 $ 1.26 $ 1.46 $ 1.19 $ 1.18 $ 1.12 $ 5.43 $ 4.95 $ 4.45
Diluted (in dollars per share) $ 1.65 $ 1.36 $ 1.11 $ 1.25 $ 1.44 $ 1.17 $ 1.15 $ 1.09 $ 5.37 $ 4.86 $ 4.34