Acquisitions (Details Textual) (USD $) In Millions, unless otherwise specified		0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended		9 Months Ended				0 Months Ended	9 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended		9 Months Ended					0 Months Ended	9 Months Ended		9 Months Ended				0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	9 Months Ended
	Sep. 30, 2014	Apr. 30, 2013 Wando [Member]	Sep. 30, 2014 Wando [Member]	Apr. 30, 2013 Adrian [Member]	Sep. 30, 2014 Adrian [Member]	Apr. 30, 2013 Adrian [Member] TMS [Member]	Sep. 30, 2014 Adrian [Member] 2014 [Member]	Sep. 30, 2014 Adrian [Member] 2015 [Member]	Sep. 30, 2014 Adrian [Member] 2016 [Member]	Sep. 30, 2014 Adrian [Member] 2017 [Member]	Jul. 25, 2013 Marisol [Member]	Sep. 30, 2014 Marisol [Member]	Jul. 25, 2013 Marisol [Member] TMS [Member]	Sep. 30, 2014 Marisol [Member] 2014 [Member]	Sep. 30, 2014 Marisol [Member] 2015 [Member]	Aug. 15, 2013 TA Drayage [Member]	Sep. 30, 2014 TA Drayage [Member]	Sep. 11, 2013 GW Palmer [Member]	Sep. 30, 2014 GW Palmer [Member]	Sep. 11, 2013 GW Palmer [Member] TL [Member]	Sep. 30, 2014 GW Palmer [Member] 2013 [Member]	Sep. 30, 2014 GW Palmer [Member] 2014 [Member]	Sep. 30, 2014 GW Palmer [Member] 2015 [Member]	Sep. 30, 2014 GW Palmer [Member] 2016 [Member]	Sep. 30, 2014 GW Palmer [Member] 2017 [Member]	Sep. 18, 2013 YES Trans [Member]	Sep. 30, 2014 YES Trans [Member]	Sep. 18, 2013 YES Trans [Member] TL [Member]	Sep. 30, 2014 YES Trans [Member] 2014 [Member]	Sep. 30, 2014 YES Trans [Member] 2015 [Member]	Sep. 30, 2014 YES Trans [Member] 2016 [Member]	Sep. 30, 2014 YES Trans [Member] 2017 [Member]	Feb. 24, 2014 Rich Logistics [Member]	Sep. 30, 2014 Rich Logistics [Member]	Mar. 14, 2014 Unitrans [Member]	Sep. 30, 2014 Unitrans [Member]	Jul. 18, 2014 ISI [Member]	Sep. 30, 2014 ISI [Member]	Aug. 27, 2014 Active Aero [Member]	Sep. 30, 2014 Active Aero [Member]
Business Acquisition (Textual) [Abstract]
Date of acquisition			Apr. 30, 2013		Apr. 30, 2013							Jul. 25, 2013					Aug. 15, 2013		Sep. 11, 2013								Sep. 18, 2013							Feb. 24, 2014		Mar. 14, 2014		Jul. 18, 2014		Aug. 27, 2014
Consideration Transferred		$ 9.0		$ 14.2							$ 66.0					$ 1.2		$ 2.5								$ 1.2							$ 47.3		$ 53.5		$ 13.0		$ 118.3
Contingent Consideration Arrangements, Basis							2.3	2.3	2.3	2.3				7.8	7.8						0.9	1.0	1.0	1.0	1.0				0.2	0.2	0.2	0.2
Contingent Consideration Arrangements, Range of Outcomes, Value, High					6.5							2.5							2.8		0.7						1.1
Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability						4.3							0							0								0
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 2.0