Condensed Consolidated Statements of Income and Comprehensive Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net sales	$ 3,940,401	$ 3,908,387	$ 7,676,452	$ 7,533,284
Cost of goods sold	2,762,071	2,729,219	5,385,303	5,269,486
Gross profit	1,178,330	1,179,168	2,291,149	2,263,798
Operating expenses:
Selling, administrative, and other expenses	832,610	832,205	1,658,164	1,636,006
Depreciation and amortization	35,603	36,783	71,487	73,640
Total operating expenses	868,213	868,988	1,729,651	1,709,646
Income before income taxes	310,117	310,180	561,498	554,152
Income taxes	114,744	112,453	205,115	198,941
Net income	$ 195,373	$ 197,727	$ 356,383	$ 355,211
Basic net income per common share	$ 1.28	$ 1.29	$ 2.34	$ 2.31
Diluted net income per common share	1.28	1.28	2.33	2.30
Dividends declared per common share	$ 0.615	$ 0.575	$ 1.230	$ 1.150
Weighted average common shares outstanding	152,134	153,463	152,394	153,595
Dilutive effect of stock options and non-vested restricted stock awards	855	1,069	880	1,063
Weighted average common shares outstanding - assuming dilution	152,989	154,532	153,274	154,658
Comprehensive income	$ 213,554	$ 240,074	$ 267,093	$ 401,451