Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Lease and rental revenues	$ 3,237,685	$ 3,170,952	$ 3,121,553
Services revenue	3,571,414	3,152,294	2,912,063
Fuel services revenue	520,500	463,738	538,277
Total revenues	7,329,599	6,786,984	6,571,893
Cost of lease and rental	2,355,043	2,234,284	2,153,450
Cost of services	3,003,348	2,602,978	2,413,156
Cost of fuel services	507,440	448,306	519,843
Other operating expenses	115,507	113,461	117,082
Selling, general and administrative expenses	871,983	805,104	822,857
Non-operating pension costs	27,741	37,593	17,797
Used vehicle sales, net	17,241	(972)	(99,853)
Interest expense	140,350	147,843	150,434
Miscellaneous income, net	(44,245)	(13,068)	(10,156)
Restructuring charges and fees, net	21,405	5,074	18,068
Total expenses	7,015,813	6,380,603	6,102,678
Earnings from continuing operations before income taxes	313,786	406,381	469,215
(Benefit from) provision for income taxes	(477,229)	141,741	163,226
Earnings from continuing operations	791,015	264,640	305,989
Loss from discontinued operations, net of tax	(457)	(2,163)	(1,221)
Net earnings	$ 790,558	$ 262,477	$ 304,768
Earnings (loss) per common share — Basic
Continuing operations (in dollars per share)	$ 14.98	$ 4.98	$ 5.78
Discontinued operations (in dollars per share)	(0.01)	(0.04)	(0.02)
Net earnings (in dollars per share)	14.97	4.94	5.75
Earnings (loss) per common share — Diluted
Continuing operations (in dollars per share)	14.87	4.94	5.73
Discontinued operations (in dollars per share)	(0.01)	(0.04)	(0.02)
Net earnings (in dollars per share)	$ 14.87	$ 4.90	$ 5.71