Segment Reporting (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	$ 17,423	$ 16,543	$ 16,404
Depreciation expense	872,262	833,841	881,216
Gains on vehicle sales, net	(62,879)	(28,727)	(12,292)
Other non-cash charges (credits), net	39,928	40,900	41,301
Interest expense (income)	133,164	129,994	144,342
Capital expenditures paid	1,698,589	1,070,092	651,953
Total assets	7,617,835	6,652,374	6,259,830
Fleet Management Solutions [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	5,388	5,011	4,692
Depreciation expense	842,094	812,588	850,214
Gains on vehicle sales, net	(62,496)	(28,765)	(12,282)
Other non-cash charges (credits), net	36,689	40,232	40,546
Interest expense (income)	133,245	130,742	144,605
Capital expenditures paid	1,653,425	1,043,280	635,135
Total assets	6,815,404	5,944,971	5,809,086
Supply Chain Solutions [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	3,663	2,927	3,295
Depreciation expense	26,780	18,476	28,692
Gains on vehicle sales, net	(383)	38	(10)
Other non-cash charges (credits), net	3,248	1,006	710
Interest expense (income)	1,621	1,062	1,707
Capital expenditures paid	27,250	14,222	8,550
Total assets	672,779	674,196	366,920
Dedicated Contract Carriage [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	649	503	480
Depreciation expense	2,338	1,809	1,335
Gains on vehicle sales, net	0
Other non-cash charges (credits), net	4	15	15
Interest expense (income)	(1,695)	(1,821)	(2,085)
Capital expenditures paid	2,959	2,123	1,436
Total assets	154,390	117,595	105,484
Central Support Service [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	7,723	8,102	7,937
Depreciation expense	1,050	968	975
Gains on vehicle sales, net	0
Other non-cash charges (credits), net	(13)	(353)	30
Interest expense (income)	(7)	11	115
Capital expenditures paid	14,955	10,467	6,832
Total assets	198,476	106,906	116,632
Eliminations [Member]
Segment Reporting, Other Significant Reconciling Item, Consolidated [Abstract]
Share-based compensation	0
Depreciation expense	0
Gains on vehicle sales, net	0
Other non-cash charges (credits), net	0
Interest expense (income)	0
Capital expenditures paid	0
Total assets	$ (223,214)	$ (191,294)	$ (138,292)