Quarterly 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
Selected Quarterly Financial Information [Abstract]
Revenue	$ 2,209,128	$ 2,252,349	$ 2,228,763	$ 2,039,573	$ 2,013,831	$ 2,097,605	$ 2,038,289	$ 1,954,614	$ 8,729,813	$ 8,104,339	$ 7,369,154
Gross profit	830,557	876,650	855,952	776,622	773,744	810,139	777,102	746,080	3,339,781	3,107,065	2,844,803
Earnings from continuing operations	210,812	263,652	294,352	196,989	208,224	233,330	205,156	186,409	965,805	833,119	773,186
Earnings from continuing operations (in dollars per basic share)	$ 1.24	$ 1.55	$ 1.72	$ 1.14	$ 1.17	$ 1.28	$ 1.12	$ 1.01	$ 5.64	$ 4.59	$ 4.16
Earnings from continuing operations (in dollars per diluted share)	$ 1.22	$ 1.53	$ 1.70	$ 1.12	$ 1.16	$ 1.27	$ 1.10	$ 1.00	$ 5.57	$ 4.53	$ 4.09
Net earnings	$ 193,963	$ 269,114	$ 330,049	$ 210,003	$ 159,860	$ 241,046	$ 214,101	$ 196,063	$ 1,003,129	$ 811,070	$ 895,243
Net earnings (in dollars per basic share)	$ 1.14	$ 1.58	$ 1.93	$ 1.21	$ 0.90	$ 1.33	$ 1.17	$ 1.07	$ 5.86	$ 4.47	$ 4.82
Net earnings (in dollars per diluted share)	$ 1.13	$ 1.56	$ 1.91	$ 1.20	$ 0.89	$ 1.31	$ 1.15	$ 1.05	$ 5.78	$ 4.41	$ 4.74