Consolidated Condensed Statements of Earnings (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Lease and rental revenues		$ 779,046	$ 733,763	$ 1,508,070	$ 1,423,445
Services revenue		737,170	741,427	1,430,874	1,451,126
Fuel services revenue		146,715	209,381	291,140	420,737
Total revenues		1,662,931	1,684,571	3,230,084	3,295,308
Cost of lease and rental		531,308	507,620	1,049,730	1,000,192
Cost of services		603,488	625,276	1,185,818	1,231,505
Cost of fuel services		142,176	203,613	278,465	410,818
Other operating expenses		32,834	31,007	67,578	67,652
Selling, general and administrative expenses		214,868	200,430	421,473	392,132
Gains on vehicle sales, net		(33,237)	(34,365)	(62,816)	(63,183)
Interest expense		39,075	35,729	75,877	71,267
Miscellaneous income, net		(1,028)	(4,828)	(3,665)	(10,210)
Total expenses		1,529,484	1,564,482	3,012,460	3,100,173
Earnings from continuing operations before income taxes		133,447	120,089	217,624	195,135
Provision for income taxes		47,530	44,368	78,381	70,288
Earnings from continuing operations		85,917	75,721	139,243	124,847
Loss from discontinued operations, net of tax		(758)	(336)	(1,295)	(1,202)
Net earnings		$ 85,159	$ 75,385	$ 137,948	$ 123,645
Earnings (loss) per common share — Basic
Continuing operations	[1]	$ 1.62	$ 1.43	$ 2.63	$ 2.36
Discontinued operations	[1]	(0.01)	0.00	(0.02)	(0.02)
Net earnings	[1]	1.61	1.43	2.61	2.34
Earnings (loss) per common share — Diluted
Continuing operations	[1]	1.61	1.42	2.61	2.34
Discontinued operations	[1]	(0.01)	(0.01)	(0.03)	(0.02)
Net earnings	[1]	1.59	1.41	2.59	2.32
Cash dividends declared per common share (in dollars per share)		$ 0.37	$ 0.34	$ 0.74	$ 0.68

[1] EPS amounts may not be additive due to rounding.