Goodwill (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) reporting_unit	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Goodwill [Line Items]
Goodwill, Impairment	$ 0
Goodwill [Roll Forward]
Goodwill		$ 422,250,000	$ 412,940,000
Accumulated impairment losses		(29,221,000)	(29,221,000)
Goodwill, Impaired, Accumulated Impairment Loss		393,029,000	383,719,000
Acquisitions			11,839,000
Reclassification to assets held for sale		(852,000)
Foreign currency translation adjustment		(3,042,000)	(2,529,000)
Goodwill		418,356,000	422,250,000
Accumulated impairment losses		(29,221,000)	(29,221,000)
Goodwill, Impaired, Accumulated Impairment Loss		389,135,000	393,029,000
Qualitative Test
Goodwill [Line Items]
Number of segment reporting units | reporting_unit	1
Quantitative
Goodwill [Line Items]
Number of segment reporting units | reporting_unit	4
Fleet Management Solutions [Member]
Goodwill [Roll Forward]
Goodwill		233,217,000	223,204,000
Accumulated impairment losses		(10,322,000)	(10,322,000)
Goodwill, Impaired, Accumulated Impairment Loss		222,895,000	212,882,000
Acquisitions			11,839,000
Reclassification to assets held for sale		0
Foreign currency translation adjustment		(1,859,000)	(1,826,000)
Goodwill		231,358,000	233,217,000
Accumulated impairment losses		(10,322,000)	(10,322,000)
Goodwill, Impaired, Accumulated Impairment Loss		221,036,000	222,895,000
Dedicated Transportation Solutions
Goodwill [Roll Forward]
Goodwill		40,808,000	40,808,000
Accumulated impairment losses		0	0
Goodwill, Impaired, Accumulated Impairment Loss		40,808,000	40,808,000
Acquisitions			0
Reclassification to assets held for sale		0
Foreign currency translation adjustment		0	0
Goodwill		40,808,000	40,808,000
Accumulated impairment losses		0	0
Goodwill, Impaired, Accumulated Impairment Loss		40,808,000	40,808,000
Supply Chain Solutions [Member]
Goodwill [Roll Forward]
Goodwill		148,225,000	148,928,000
Accumulated impairment losses		(18,899,000)	(18,899,000)
Goodwill, Impaired, Accumulated Impairment Loss		129,326,000	130,029,000
Acquisitions			0
Reclassification to assets held for sale		(852,000)
Foreign currency translation adjustment		(1,183,000)	(703,000)
Goodwill		146,190,000	148,225,000
Accumulated impairment losses		(18,899,000)	(18,899,000)
Goodwill, Impaired, Accumulated Impairment Loss		127,291,000	$ 129,326,000
CRSAL [Member]
Goodwill [Roll Forward]
Reclassification to assets held for sale		$ (852,000)