Acquisitions - Pro Forma Information (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
Business Acquisition, Pro Forma Information [Abstract]
Acquisition related costs (after tax)									$ 2,905
Amount of nonrecurring expense, excluded from current period net earnings in pro forma financials, related to the fair value adjustments to acquisition-date inventory									4,963
Revenue from continuing operations [Abstract]
As reported	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
Pro forma									8,852,973	8,712,047
Earnings from continuing operations [Abstract]
As reported	210,812	263,652	294,352	196,989	208,224	233,330	205,156	186,409	965,805	833,119	773,186
Pro forma									$ 972,026	$ 868,803
Basic earnings per share from continuing operations [Abstract]
As reported (in dollars per share)	$ 1.24	$ 1.55	$ 1.72	$ 1.14	$ 1.17	$ 1.28	$ 1.12	$ 1.01	$ 5.64	$ 4.59	$ 4.16
Pro forma (in dollars per share)									$ 5.68	$ 4.79
Diluted earnings per share from continuing operations [Abstract]
As reported (in dollars per share)	$ 1.22	$ 1.53	$ 1.70	$ 1.12	$ 1.16	$ 1.27	$ 1.10	$ 1.00	$ 5.57	$ 4.53	$ 4.09
Pro forma (in dollars per share)									$ 5.60	$ 4.72