Consolidated Condensed Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
Lease and rental revenues	$ 693,912	$ 675,288	$ 2,007,393	$ 1,889,420
Service revenue	667,399	669,925	2,021,284	1,943,145
Fuel services revenue	211,984	225,507	644,754	676,875
Total revenues	1,573,295	1,570,720	4,673,431	4,509,440
Cost of lease and rental	481,240	461,756	1,414,456	1,299,467
Cost of services	557,495	554,853	1,697,773	1,626,334
Cost of fuel services	207,689	223,339	632,599	665,750
Other operating expenses	32,966	30,268	100,881	95,071
Selling, general and administrative expenses	183,713	200,096	568,027	568,373
Gains on vehicle sales, net	(23,147)	(18,270)	(67,684)	(46,277)
Interest expense	34,879	32,745	105,266	100,138
Miscellaneous income, net	(1,424)	(1,722)	(7,245)	(6,459)
Restructuring and other charges, net	74	0	8,081	768
Total expenses	1,473,485	1,483,065	4,452,154	4,303,165
Earnings from continuing operations before income taxes	99,810	87,655	221,277	206,275
Provision for income taxes	35,499	30,722	75,323	82,571
Earnings from continuing operations	64,311	56,933	145,954	123,704
Earnings (loss) from discontinued operations, net of tax	10,780	(409)	10,181	(2,022)
Net earnings	75,091	56,524	156,135	121,682
Earnings (loss) per common share - Basic
Continuing operations	$ 1.26	$ 1.11	$ 2.86	$ 2.41
Discontinued operations	$ 0.21	$ (0.01)	$ 0.20	$ (0.04)
Net earnings	$ 1.47	$ 1.10	$ 3.06	$ 2.37
Earnings (loss) per common share - Diluted
Continuing operations	$ 1.26	$ 1.10	$ 2.84	$ 2.39
Discontinued operations	$ 0.21	$ 0.00	$ 0.20	$ (0.04)
Net earnings	$ 1.47	$ 1.10	$ 3.04	$ 2.35
Comprehensive income	$ 105,059	$ 6,106	$ 198,712	$ 101,384
Cash dividends declared per common share	$ 0.31	$ 0.29	$ 0.89	$ 0.83