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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Data [Abstract]                      
Net sales $ 809,910 $ 747,641 $ 724,872 $ 711,066 $ 739,204 $ 712,705 $ 699,871 $ 645,309 $ 2,993,489 $ 2,797,089 $ 2,386,112
Gross profit 466,361 416,555 397,608 391,193 405,849 382,556 377,063 350,096 1,671,717 1,515,564 1,275,126
Income from operations 225,242 183,257 178,784 170,304 187,354 167,215 163,970 142,000 757,587 660,539 514,294
Net earnings $ 143,530 $ 116,708 $ 114,813 $ 108,309 $ 121,676 $ 110,281 $ 106,311 $ 88,979 $ 483,360 $ 427,247 $ 322,580
Earnings from continuing operations per common share:                      
Basic (in dollars per share) $ 1.46 $ 1.19 $ 1.18 $ 1.12 $ 1.26 $ 1.15 $ 1.11 $ 0.93 $ 4.95 $ 4.45 $ 3.42
Diluted (in dollars per share) $ 1.44 $ 1.17 $ 1.15 $ 1.09 $ 1.23 $ 1.12 $ 1.08 $ 0.91 $ 4.86 $ 4.34 $ 3.34