Goodwill (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
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
Reclassification to assets held for sale			(852,000)
Foreign currency translation adjustment		(2,363,000)	(3,042,000)
Goodwill		415,993,000	418,356,000
Accumulated impairment losses		(29,221,000)	(29,221,000)
Goodwill, impaired, accumulated impairment loss		386,772,000	389,135,000
Goodwill, Impairment	$ 0
Fleet Management Solutions
Goodwill [Roll Forward]
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
Reclassification to assets held for sale			0
Foreign currency translation adjustment		(2,526,000)	(1,859,000)
Goodwill		228,832,000	231,358,000
Accumulated impairment losses		(10,322,000)	(10,322,000)
Goodwill, impaired, accumulated impairment loss		218,510,000	221,036,000
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
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
Goodwill [Roll Forward]
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
Reclassification to assets held for sale			(852,000)
Foreign currency translation adjustment		163,000	(1,183,000)
Goodwill		146,353,000	146,190,000
Accumulated impairment losses		(18,899,000)	(18,899,000)
Goodwill, impaired, accumulated impairment loss		$ 127,454,000	$ 127,291,000