Consolidated Condensed Statements of Earnings (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Lease and rental revenues		$ 802,881	$ 756,733	$ 2,310,951	$ 2,180,178
Services revenue		734,803	732,049	2,165,677	2,183,175
Fuel services revenue		131,382	198,368	422,522	619,105
Total revenues		1,669,066	1,687,150	4,899,150	4,982,458
Cost of lease and rental		550,541	522,202	1,600,271	1,522,394
Cost of services		606,364	607,530	1,792,182	1,839,035
Cost of fuel services		129,562	194,926	408,027	605,744
Other operating expenses		31,286	28,889	98,864	96,541
Selling, general and administrative expenses		203,093	202,001	624,566	594,133
Gains on vehicle sales, net		(29,294)	(33,691)	(92,110)	(96,874)
Interest expense		38,986	36,681	114,863	107,948
Miscellaneous income, net		(1,372)	(996)	(5,037)	(11,206)
Total expenses		1,529,166	1,557,542	4,541,626	4,657,715
Earnings from continuing operations before income taxes		139,900	129,608	357,524	324,743
Provision for income taxes		49,089	45,713	127,470	116,001
Earnings from continuing operations		90,811	83,895	230,054	208,742
Loss from discontinued operations, net of tax		(192)	(278)	(1,487)	(1,480)
Net earnings		$ 90,619	$ 83,617	$ 228,567	$ 207,262
Earnings (loss) per common share — Basic
Continuing operations (in dollars per share)		$ 1.71	$ 1.60	$ 4.35	$ 3.96	[1]
Discontinued operations (in dollars per share)	[1]	0.00	(0.01)	(0.03)	(0.03)
Net earnings (in dollars per share)	[1]	1.71	1.59	4.32	3.93
Earnings (loss) per common share — Diluted
Continuing operations (in dollars per share)		1.70	1.58	4.31	3.92	[1]
Discontinued operations (in dollars per share)	[1]	0.00	(0.01)	(0.03)	(0.03)
Net earnings (in dollars per share)	[1]	1.69	1.57	4.28	3.89
Cash dividends declared per common share (in dollars per share)		$ 0.41	$ 0.37	$ 1.15	$ 1.05

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