Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014 segment		Sep. 30, 2013
Segment Reporting Information [Line Items]
Number of Reportable Segments					2
Financial information of business segments
Total revenues	$ 1,687,150		$ 1,634,540		$ 4,982,458		$ 4,801,556
Segment EBT	147,568		126,901		370,429		317,069
Unallocated CSS	(13,564)		(10,053)		(36,518)		(32,012)
Non-operating pension costs	(2,455)		(5,090)		(7,313)		(15,333)
Restructuring and other recoveries, net and other items	(1,828)	[1]	(360)	[1]	(1,828)	[1]	1,544	[1]
Earnings from continuing operations before income taxes	129,721		111,398		324,770		271,268
Segment capital expenditures paid	478,036	[2],[3]	542,349	[2],[3]	1,677,534	[2],[4]	1,476,808	[2],[4]
Unallocated CSS	7,915		5,361		63,639		19,016
Capital expenditures paid	485,951		547,710		1,741,173		1,495,824
Segment Reporting (Textuals) [Abstract]
Acquisition payments	(8,100)		(500)		(9,785)		(1,858)
Fleet Management Solutions [Member]
Financial information of business segments
Total revenues	1,069,333		1,023,790		3,139,721		3,017,150
Segment EBT	120,980		96,428		311,480		245,840
Segment capital expenditures paid	470,552	[2],[3]	538,453	[2],[3]	1,661,929	[2],[4]	1,462,095	[2],[4]
Supply Chain Solutions [Member]
Financial information of business segments
Total revenues	617,817		610,750		1,842,737		1,784,406
Segment EBT	36,152		39,607		88,664		97,011
Segment capital expenditures paid	7,484	[2],[3]	3,896	[2],[3]	15,605	[2],[4]	14,713	[2],[4]
Eliminations [Member]
Financial information of business segments
Total revenues	0		0		0		0
Segment EBT	(9,564)		(9,134)		(29,715)		(25,782)
Segment capital expenditures paid	0	[2],[3]	0	[2],[3]	0	[2],[4]	0	[2],[4]
Intersegment Eliminations [Member]
Financial information of business segments
Total revenues	0		0		0		0
Intersegment Eliminations [Member] | Fleet Management Solutions [Member]
Financial information of business segments
Total revenues	117,589		114,427		363,510		342,057
Intersegment Eliminations [Member] | Supply Chain Solutions [Member]
Financial information of business segments
Total revenues	0		0		0		0
Intersegment Eliminations [Member] | Eliminations [Member]
Financial information of business segments
Total revenues	(117,589)		(114,427)		(363,510)		(342,057)
Operating Segments [Member]
Financial information of business segments
Total revenues	1,687,150		1,634,540		4,982,458		4,801,556
Operating Segments [Member] | Fleet Management Solutions [Member]
Financial information of business segments
Total revenues	1,186,922		1,138,217		3,503,231		3,359,207
Operating Segments [Member] | Supply Chain Solutions [Member]
Financial information of business segments
Total revenues	617,817		610,750		1,842,737		1,784,406
Operating Segments [Member] | Eliminations [Member]
Financial information of business segments
Total revenues	$ (117,589)		$ (114,427)		$ (363,510)		$ (342,057)

[1] See Note (O), "Other Items Impacting Comparability," for additional information.

[2] Excludes revenue earning equipment acquired under capital leases.

[3] Excludes acquisition payments of $8.1 million and $0.5 million during the three months ended September 30, 2014 and 2013, respectively

[4] Excludes acquisition payments of $9.8 million and $1.9 million during the nine months ended September 30, 2014, and 2013, respectively.