Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Sales	$ 7,216,081us-gaap_SalesRevenueNet	$ 6,649,237us-gaap_SalesRevenueNet	$ 6,182,184us-gaap_SalesRevenueNet
Cost of goods sold, including warehouse and distribution expenses	3,507,180us-gaap_CostOfGoodsSold	3,280,236us-gaap_CostOfGoodsSold	3,084,766us-gaap_CostOfGoodsSold
Gross profit	3,708,901us-gaap_GrossProfit	3,369,001us-gaap_GrossProfit	3,097,418us-gaap_GrossProfit
Selling, general and administrative expenses	2,438,527	2,265,516	2,120,025
Operating income	1,270,374us-gaap_OperatingIncomeLoss	1,103,485us-gaap_OperatingIncomeLoss	977,393us-gaap_OperatingIncomeLoss
Other income (expense):
Interest expense	(53,290)us-gaap_InterestExpenseDebt	(49,074)us-gaap_InterestExpenseDebt	(40,200)us-gaap_InterestExpenseDebt
Interest income	2,301us-gaap_OtherInterestAndDividendIncome	1,992us-gaap_OtherInterestAndDividendIncome	2,441us-gaap_OtherInterestAndDividendIncome
Other, net	2,797us-gaap_OtherNonoperatingIncomeExpense	2,539us-gaap_OtherNonoperatingIncomeExpense	1,887us-gaap_OtherNonoperatingIncomeExpense
Total other expense	(48,192)us-gaap_NonoperatingIncomeExpense	(44,543)us-gaap_NonoperatingIncomeExpense	(35,872)us-gaap_NonoperatingIncomeExpense
Income before income taxes	1,222,182	1,058,942	941,521
Provision for income taxes	444,000us-gaap_IncomeTaxExpenseBenefit	388,650us-gaap_IncomeTaxExpenseBenefit	355,775us-gaap_IncomeTaxExpenseBenefit
Net income	$ 778,182us-gaap_NetIncomeLoss	$ 670,292us-gaap_NetIncomeLoss	$ 585,746us-gaap_NetIncomeLoss
Earnings per share-basic:
Earnings per share - basic	$ 7.46us-gaap_EarningsPerShareBasic	$ 6.14us-gaap_EarningsPerShareBasic	$ 4.83us-gaap_EarningsPerShareBasic
Weighted-average common shares outstanding - basic	104,262	109,244	121,182
Earnings per share-assuming dilution:
Earnings per share - assuming dilution	$ 7.34us-gaap_EarningsPerShareDiluted	$ 6.03us-gaap_EarningsPerShareDiluted	$ 4.75us-gaap_EarningsPerShareDiluted
Weighted-average common shares outstanding - assuming dilution	106,041	111,101	123,314

Total costs related to goods produced and sold during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 2

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688