Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Net sales	$ 943,640	$ 883,933	$ 889,541	$ 865,281	$ 946,145	$ 884,122	$ 885,175	$ 834,052	$ 3,582,395	$ 3,549,494	$ 3,238,128
Gross profit	579,091	533,483	533,911	518,161	565,741	524,040	523,182	488,936	2,164,646	2,101,899	1,882,928
Income from operations	278,677	250,371	251,974	246,896	283,749	245,658	246,666	223,400	1,027,918	999,473	842,361
Net earnings	$ 208,597	$ 160,417	$ 171,280	$ 155,773	$ 185,936	$ 155,510	$ 157,361	$ 147,226	$ 696,067	$ 646,033	$ 538,293
Earnings from continuing operations per common share:
Basic (in dollars per share)	$ 2.07	$ 1.59	$ 1.70	$ 1.55	$ 1.86	$ 1.55	$ 1.58	$ 1.48	$ 6.92	$ 6.47	$ 5.43
Diluted (in dollars per share)	$ 2.05	$ 1.58	$ 1.69	$ 1.54	$ 1.84	$ 1.54	$ 1.56	$ 1.46	$ 6.85	$ 6.40	$ 5.37