Condensed Consolidated Statements of Income and Comprehensive Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net sales	$ 3,921,802	$ 3,985,909	$ 11,598,254	$ 11,519,193
Cost of goods sold	2,752,577	2,802,487	8,137,880	8,071,973
Gross profit	1,169,225	1,183,422	3,460,374	3,447,220
Operating expenses:
Selling, administrative, and other expenses	834,372	850,156	2,492,537	2,486,162
Depreciation and amortization	34,278	34,983	105,764	108,623
Total operating expenses	868,650	885,139	2,598,301	2,594,785
Income before income taxes	300,575	298,283	862,073	852,435
Income taxes	112,559	107,767	317,674	306,708
Net income	$ 188,016	$ 190,516	$ 544,399	$ 545,727
Basic net income per common share	$ 1.24	$ 1.25	$ 3.58	$ 3.56
Diluted net income per common share	1.24	1.24	3.56	3.53
Dividends declared per common share	$ 0.615	$ 0.575	$ 1.845	$ 1.725
Weighted average common shares outstanding	151,354	153,018	152,043	153,401
Dilutive effect of stock options and non-vested restricted stock awards	789	1,080	847	1,062
Weighted average common shares outstanding - assuming dilution	152,143	154,098	152,890	154,463
Comprehensive income	$ 82,931	$ 95,077	$ 350,024	$ 496,528