Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Cash Flows [Abstract]
Net cash provided by operating activities (Note 2)	$ 1,100,118	$ 1,146,677	$ 977,093
Cash flows from investing activities of continuing operations:
Capital expenditures	(259,974)	(232,319)	(208,321)
Origination of finance receivables	(3,751,830)	(3,568,423)	(3,244,005)
Collections on finance receivables	3,136,885	3,013,245	2,831,994
Purchases of marketable securities	0	0	(4,998)
Sales and redemptions of marketable securities	11,507	41,010	40,108
Payments to Acquire Businesses, Gross	(59,910)	0	0
Other	7,474	1,837	16,355
Net cash used by investing activities	(915,848)	(744,650)	(568,867)
Cash flows from financing activities of continuing operations:
Proceeds from issuance of medium-term notes	595,386	991,835	0
Repayments of medium-term notes	(610,331)	(526,431)	(27,858)
Proceeds from Issuance of Senior Long-term Debt	740,385	0	0
Repayments of Senior Debt	0	303,000	0
Proceeds from securitization debt	1,195,668	847,126	647,516
Repayments of securitization debt	(1,008,135)	(834,856)	(840,387)
Borrowings of asset-backed commercial paper	87,442	84,907	88,456
Repayments of asset-backed commercial paper	(72,727)	(77,800)	(78,765)
Net increase in credit facilities and unsecured commercial paper	469,473	63,945	371,085
Net change in restricted cash	11,410	22,755	43,201
Dividends paid	(249,262)	(238,300)	(187,688)
Purchase of common stock for treasury	(1,537,020)	(615,602)	(479,231)
Excess tax benefits from share-based payments	3,468	11,540	19,895
Issuance of common stock under employee stock option plans	20,179	37,785	50,567
Net cash used by financing activities	(354,064)	(536,096)	(393,209)
Effect of exchange rate changes on cash and cash equivalents	(14,677)	(25,863)	(16,543)
Net decrease in cash and cash equivalents	(184,471)	(159,932)	(1,526)
Cash and cash equivalents:
Cash and cash equivalents—beginning of period	906,680	1,066,612	1,068,138
Net decrease in cash and cash equivalents	(184,471)	(159,932)	(1,526)
Cash and cash equivalents—end of period	$ 722,209	$ 906,680	$ 1,066,612