Quarterly 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
Selected Quarterly Financial Information [Abstract]
Revenue	$ 2,013,831	$ 2,097,605	$ 2,038,289	$ 1,954,614	$ 1,890,962	$ 1,999,550	$ 1,819,594	$ 1,659,048	$ 8,104,339	$ 7,369,154	$ 6,109,507
Gross Profit	773,744	810,139	777,102	746,080	718,333	757,608	712,729	656,133	3,107,065	2,844,803	2,422,646
Earnings from continuing operations	208,224	233,330	205,156	186,409	197,267	207,515	213,259	155,145	833,119	773,186	619,497
Earnings from continuing operations (in dollars per basic share)	$ 1.17	$ 1.28	$ 1.12	$ 1.01	$ 1.07	$ 1.12	$ 1.14	$ 0.83	$ 4.59	$ 4.16	$ 3.31
Earnings from continuing operations (in dollars per diluted share)	$ 1.16	$ 1.27	$ 1.10	$ 1.00	$ 1.05	$ 1.10	$ 1.12	$ 0.82	$ 4.53	$ 4.09	$ 3.27
Net earnings	$ 159,860	$ 241,046	$ 214,101	$ 196,063	$ 278,289	$ 172,280	$ 249,769	$ 194,905	$ 811,070	$ 895,243	$ 700,104
Net earnings (in dollars per basic share)	$ 0.90	$ 1.33	$ 1.17	$ 1.07	$ 1.51	$ 0.93	$ 1.34	$ 1.04	$ 4.47	$ 4.82	$ 3.75
Net earnings (in dollars per diluted share)	$ 0.89	$ 1.31	$ 1.15	$ 1.05	$ 1.49	$ 0.91	$ 1.32	$ 1.03	$ 4.41	$ 4.74	$ 3.70