Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Lease and rental revenues	$ 3,121,553	$ 2,939,422	$ 2,770,026
Services revenue	2,912,063	2,911,465	2,819,673
Fuel services revenue	538,277	787,887	829,586
Total revenues	6,571,893	6,638,774	6,419,285
Cost of lease and rental	2,153,450	2,036,881	1,925,546
Cost of services	2,413,156	2,447,867	2,359,880
Cost of fuel services	519,843	768,292	814,058
Other operating expenses	135,038	126,572	131,659
Selling, general and administrative expenses	844,497	816,975	790,681
Pension lump sum settlement expense	0	97,231	0
Gains on vehicles sales, net	(117,809)	(126,824)	(96,175)
Interest expense	150,434	144,739	140,463
Miscellaneous income, net	(10,156)	(13,613)	(15,372)
Restructuring and other charges (recoveries), net	14,225	2,387	(470)
Total expenses	6,102,678	6,300,507	6,050,270
Earnings from continuing operations before income taxes	469,215	338,267	369,015
Provision for income taxes	163,226	118,042	125,740
Earnings from continuing operations	305,989	220,225	243,275
Loss from discontinued operations, net of tax	(1,221)	(1,884)	(5,404)
Net earnings	$ 304,768	$ 218,341	$ 237,871
Earnings (loss) per common share — Basic
Continuing operations (in dollars per share)	$ 5.78	$ 4.18	$ 4.67
Discontinued operations (in dollars per share)	(0.02)	(0.04)	(0.10)
Net earnings (in dollars per share)	5.75	4.14	4.57
Earnings (loss) per common share — Diluted
Continuing operations (in dollars per share)	5.73	4.14	4.63
Discontinued operations (in dollars per share)	(0.02)	(0.03)	(0.10)
Net earnings (in dollars per share)	$ 5.71	$ 4.11	$ 4.53