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Quarterly Results (unaudited) (Unaudited Operating Data) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Data [Abstract]                      
Sales $ 2,190,808 $ 2,339,830 $ 2,290,829 $ 2,156,259 $ 2,099,302 $ 2,220,955 $ 2,176,689 $ 2,096,150 $ 8,977,726 $ 8,593,096 $ 7,966,674
Gross profit 1,159,180 1,230,294 1,200,062 1,131,147 1,114,227 1,170,026 1,127,179 1,097,579 4,720,683 4,509,011 4,162,643
Operating income 402,835 461,963 457,445 403,157 407,710 447,809 425,061 418,626 1,725,400 1,699,206 1,514,021
Net income $ 302,315 $ 283,734 $ 282,821 $ 264,934 $ 246,030 $ 278,493 $ 257,794 $ 255,374 $ 1,133,804 $ 1,037,691 $ 931,216
Earnings per share - basic $ 3.56 [1] $ 3.26 [1] $ 3.14 [1] $ 2.88 [1] $ 2.62 [1] $ 2.93 [1] $ 2.69 [1] $ 2.63 [1] $ 12.82 $ 10.87 $ 9.32
Earnings per share - assuming dilution $ 3.52 [1] $ 3.22 [1] $ 3.10 [1] $ 2.83 [1] $ 2.59 [1] $ 2.90 [1] $ 2.65 [1] $ 2.59 [1] $ 12.67 $ 10.73 $ 9.17
[1] Earnings per share amounts are computed independently for each quarter and annual period. The quarterly earnings per share amounts may not sum to equal the full-year earnings per share amount.