General - Schedule of Error Corrections and Prior Period Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Statement [Abstract]
Cost of lease and rental	$ 550,541	$ 522,202	$ 1,600,271	$ 1,522,394
Interest expense	38,986	36,681	114,863	107,948
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
Net earnings	90,619	83,617	228,567	207,262
Statement of Comprehensive Income [Abstract]
Comprehensive income (loss)	52,332	39,689	163,692	179,087
Statement of Financial Position [Abstract]
Revenue earning equipment, net	8,036,710		8,036,710		$ 7,201,886
Total assets	10,820,186		10,820,186		9,883,424
Short-term debt and current portion of long-term debt	305,759		305,759		36,284
Accrued expenses and other current liabilities	511,198		511,198		513,679
Total current liabilities	1,367,262		1,367,262		1,110,815
Long-term debt	5,144,938		5,144,938		4,694,335
Other non-current liabilities	780,415		780,415		783,342
Deferred income taxes	1,575,507		1,575,507		1,475,845
Total liabilities	8,868,122		8,868,122		8,064,337
Retained earnings	1,612,744		1,612,744		1,450,509
Total shareholders’ equity	1,952,064		1,952,064		1,819,087
Total liabilities and shareholders’ equity	10,820,186		10,820,186		9,883,424
Statement of Cash Flows [Abstract]
Net earnings	$ 90,619	83,617	228,567	207,262
Depreciation expense			838,100	781,367
Accrued expenses and other non-current liabilities			(3,385)	(46,357)
Net cash provided by operating activities from continuing operations			1,071,336	981,044
Debt proceeds			1,329,810	895,733
Debt repaid, including capital and financing lease obligations			(795,837)	(284,811)
Net cash provided by financing activities from continuing operations			664,783	332,501
Sale and leaseback of revenue earning equipment				0
Net cash used in investing activities from continuing operations			$ (1,707,378)	(1,297,281)
As Previously Reported [Member]
Income Statement [Abstract]
Cost of lease and rental		522,900		1,524,000
Interest expense		35,900		106,300
Earnings from continuing operations before income taxes		129,700		324,800
Provision for income taxes		45,800		116,000
Earnings from continuing operations		84,000		208,800
Net earnings		83,700		207,300
Statement of Comprehensive Income [Abstract]
Comprehensive income (loss)		39,800		179,100
Statement of Financial Position [Abstract]
Revenue earning equipment, net					6,994,400
Total assets					9,676,000
Short-term debt and current portion of long-term debt					12,200
Accrued expenses and other current liabilities					520,500
Total current liabilities					1,093,600
Long-term debt					4,500,300
Other non-current liabilities					786,700
Deferred income taxes					1,476,000
Total liabilities					7,856,500
Retained earnings					1,450,900
Total shareholders’ equity					1,819,500
Total liabilities and shareholders’ equity					9,676,000
Statement of Cash Flows [Abstract]
Net earnings		83,700		207,300
Depreciation expense				770,100
Accrued expenses and other non-current liabilities				(41,500)
Net cash provided by operating activities from continuing operations				974,700
Debt proceeds				769,900
Debt repaid, including capital and financing lease obligations				(278,400)
Net cash provided by financing activities from continuing operations				213,100
Sale and leaseback of revenue earning equipment				125,800
Net cash used in investing activities from continuing operations				(1,171,500)
Adjustment [Member]
Income Statement [Abstract]
Cost of lease and rental		(700)		(1,600)
Interest expense		800		1,600
Earnings from continuing operations before income taxes		(100)		(100)
Provision for income taxes		(100)		0
Earnings from continuing operations		(100)		(100)
Net earnings		(100)		0
Statement of Comprehensive Income [Abstract]
Comprehensive income (loss)		(100)		0
Statement of Financial Position [Abstract]
Revenue earning equipment, net					207,400
Total assets					207,400
Short-term debt and current portion of long-term debt					24,100
Accrued expenses and other current liabilities					(6,800)
Total current liabilities					17,200
Long-term debt					194,000
Other non-current liabilities					(3,400)
Deferred income taxes					(200)
Total liabilities					207,800
Retained earnings					(400)
Total shareholders’ equity					(400)
Total liabilities and shareholders’ equity					$ 207,400
Statement of Cash Flows [Abstract]
Net earnings		$ (100)		0
Depreciation expense				11,300
Accrued expenses and other non-current liabilities				(4,900)
Net cash provided by operating activities from continuing operations				6,300
Debt proceeds				125,800
Debt repaid, including capital and financing lease obligations				(6,400)
Net cash provided by financing activities from continuing operations				119,400
Sale and leaseback of revenue earning equipment				(125,800)
Net cash used in investing activities from continuing operations				$ (125,800)