Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 3,941,743	$ 3,921,802	$ 11,559,648	$ 11,598,254
Cost of goods sold	2,743,142	2,752,577	8,091,124	8,137,880
Gross profit	1,198,601	1,169,225	3,468,524	3,460,374
Operating expenses:
Selling, administrative and other expenses	869,562	834,372	2,522,223	2,492,537
Depreciation and amortization	37,682	34,278	108,247	105,764
Total operating expenses	907,244	868,650	2,630,470	2,598,301
Income before income taxes	291,357	300,575	838,054	862,073
Income taxes	106,031	112,559	303,334	317,674
Net income	$ 185,326	$ 188,016	$ 534,720	$ 544,399
Basic net income per common share (usd per share)	$ 1.24	$ 1.24	$ 3.58	$ 3.58
Diluted net income per common share (usd per share)	1.24	1.24	3.56	3.56
Dividends declared per common share (usd per share)	$ 0.6575	$ 0.615	$ 1.9725	$ 1.845
Weighted average common shares outstanding (in shares)	148,899	151,354	149,243	152,043
Dilutive effect of stock options and non-vested restricted stock awards (in shares)	828	789	781	847
Weighted average common shares outstanding - assuming dilution (in shares)	149,727	152,143	150,024	152,890
Comprehensive income	$ 201,981	$ 82,931	$ 599,828	$ 350,024