Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 3,899,638	$ 3,940,401	$ 7,617,905	$ 7,676,452
Cost of goods sold	2,734,186	2,762,071	5,347,982	5,385,303
Gross profit	1,165,452	1,178,330	2,269,923	2,291,149
Operating expenses:
Selling, administrative and other expenses	829,489	832,610	1,652,661	1,658,164
Depreciation and amortization	35,911	35,603	70,565	71,487
Total operating expenses	865,400	868,213	1,723,226	1,729,651
Income before income taxes	300,052	310,117	546,697	561,498
Income taxes	108,683	114,744	197,303	205,115
Net income	$ 191,369	$ 195,373	$ 349,394	$ 356,383
Basic net income per common share (usd per share)	$ 1.28	$ 1.28	$ 2.34	$ 2.34
Diluted net income per common share (usd per share)	1.28	1.28	2.33	2.33
Dividends declared per common share (usd per share)	$ 0.6575	$ 0.615	$ 1.315	$ 1.230
Weighted average common shares outstanding (in shares)	149,241	152,134	149,417	152,394
Dilutive effect of stock options and non-vested restricted stock awards (in shares)	788	855	761	880
Weighted average common shares outstanding - assuming dilution (in shares)	150,029	152,989	150,178	153,274
Comprehensive income	$ 171,723	$ 213,554	$ 397,847	$ 267,093