Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	$ 19,310	$ 18,864	$ 17,423
Depreciation expense	957,141	939,677	872,262
Gains on vehicle sales, net	(96,175)	(89,108)	(62,879)
Other non-cash charges (credits), net	56,389	49,209	39,928
Interest expense (income)	137,196	140,557	133,164
Capital expenditures paid	2,140,464	2,133,235	1,698,589
Total assets	9,103,782	8,318,979	7,617,835
Fleet Management Solutions [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	4,979	5,359	5,388
Depreciation expense	926,724	910,352	842,094
Gains on vehicle sales, net	(96,011)	(89,075)	(62,496)
Other non-cash charges (credits), net	19,071	15,567	16,271
Interest expense (income)	139,288	140,747	133,245
Capital expenditures paid	2,092,544	2,090,443	1,653,425
Total assets	8,309,149	7,556,509	6,815,404
Supply Chain Solutions [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	4,934	4,433	4,312
Depreciation expense	29,560	28,275	29,118
Gains on vehicle sales, net	(164)	(33)	(383)
Other non-cash charges (credits), net	3,640	2,768	3,214
Interest expense (income)	(1,864)	11	(74)
Capital expenditures paid	22,677	19,278	30,209
Total assets	869,074	807,935	827,169
Central Support Service [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	9,397	9,072	7,723
Depreciation expense	857	1,050	1,050
Gains on vehicle sales, net	0	0	0
Other non-cash charges (credits), net	33,678	30,874	20,443
Interest expense (income)	(228)	(201)	(7)
Capital expenditures paid	25,243	23,514	14,955
Total assets	160,249	144,355	198,476
Eliminations [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	0	0	0
Depreciation expense	0	0	0
Gains on vehicle sales, net	0	0	0
Other non-cash charges (credits), net	0	0	0
Interest expense (income)	0	0	0
Capital expenditures paid	0	0	0
Total assets	$ (234,690)	$ (189,820)	$ (223,214)