Acquisitions (Details Textual) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended				0 Months Ended	12 Months Ended							0 Months Ended	12 Months Ended					0 Months Ended	12 Months Ended						0 Months Ended	12 Months Ended							0 Months Ended	12 Months Ended					0 Months Ended	12 Months Ended						0 Months Ended	12 Months Ended						0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended						0 Months Ended	12 Months Ended				0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended							0 Months Ended	12 Months Ended
	Aug. 31, 2011 Prime [Member]	Dec. 31, 2013 Prime [Member]	Feb. 24, 2012 CTL [Member]	Dec. 31, 2013 CTL [Member]	Dec. 31, 2013 CTL [Member] 2012	Dec. 31, 2013 CTL [Member] 2013	Feb. 24, 2012 CTL [Member] TMS	Apr. 19, 2012 D&E [Member]	Dec. 31, 2013 D&E [Member]	Dec. 31, 2013 D&E [Member] 2012	Dec. 31, 2013 D&E [Member] 2013	Dec. 31, 2013 D&E [Member] 2014	Dec. 31, 2013 D&E [Member] Maximum	Dec. 31, 2013 D&E [Member] Minimum	Apr. 19, 2012 D&E [Member] TL	Jun. 04, 2012 CTW [Member]	Dec. 31, 2013 CTW [Member]	Dec. 31, 2013 CTW [Member] 2012	Dec. 31, 2013 CTW [Member] 2013	Dec. 31, 2013 CTW [Member] 2014	Jun. 04, 2012 CTW [Member] TL	Aug. 01, 2012 R&M [Member]	Dec. 31, 2013 R&M [Member]	Dec. 31, 2013 R&M [Member] 2012	Dec. 31, 2013 R&M [Member] 2013	Dec. 31, 2013 R&M [Member] 2014	Dec. 31, 2013 R&M [Member] 2015	Aug. 01, 2012 R&M [Member] TL	Aug. 10, 2012 EFS [Member]	Dec. 31, 2013 EFS [Member]	Dec. 31, 2013 EFS [Member] 2012	Dec. 31, 2013 EFS [Member] 2013	Dec. 31, 2013 EFS [Member] 2014	Dec. 31, 2013 EFS [Member] 2015	Dec. 31, 2013 EFS [Member] 2016	Aug. 10, 2012 EFS [Member] LTL	Dec. 21, 2012 DCT [Member]	Dec. 31, 2013 DCT [Member]	Dec. 31, 2013 DCT [Member] 2013	Dec. 31, 2013 DCT [Member] 2014	Dec. 31, 2013 DCT [Member] 2015	Dec. 21, 2012 DCT [Member] TL	Nov. 05, 2012 Central Cal [Member]	Dec. 31, 2013 Central Cal [Member]	Dec. 31, 2013 Central Cal [Member] 2013	Dec. 31, 2013 Central Cal [Member] 2014	Dec. 31, 2013 Central Cal [Member] 2015	Dec. 31, 2013 Central Cal [Member] 2016	Nov. 05, 2012 Central Cal [Member] TL	Nov. 12, 2012 A&A [Member]	Dec. 31, 2013 A&A [Member]	Dec. 31, 2013 A&A [Member] 2013	Dec. 31, 2013 A&A [Member] 2014	Dec. 31, 2013 A&A [Member] 2015	Dec. 31, 2013 A&A [Member] 2016	Nov. 12, 2012 A&A [Member] TL	Apr. 30, 2013 Wando [Member]	Dec. 31, 2013 Wando [Member]	Apr. 30, 2013 Adrian [Member]	Dec. 31, 2013 Adrian [Member]	Dec. 31, 2013 Adrian [Member] 2014	Dec. 31, 2013 Adrian [Member] 2015	Dec. 31, 2013 Adrian [Member] 2016	Dec. 31, 2013 Adrian [Member] 2017	Apr. 30, 2013 Adrian [Member] TMS	Jul. 25, 2013 Marisol [Member]	Dec. 31, 2013 Marisol [Member]	Dec. 31, 2013 Marisol [Member] 2014	Dec. 31, 2013 Marisol [Member] 2015	Jul. 25, 2013 Marisol [Member] TMS	Aug. 15, 2013 TA Drayage [Member]	Dec. 31, 2013 TA Drayage [Member]	Sep. 11, 2013 GW Palmer [Member]	Dec. 31, 2013 GW Palmer [Member]	Dec. 31, 2013 GW Palmer [Member] 2013	Dec. 31, 2013 GW Palmer [Member] 2014	Dec. 31, 2013 GW Palmer [Member] 2015	Dec. 31, 2013 GW Palmer [Member] 2016	Dec. 31, 2013 GW Palmer [Member] 2017	Sep. 11, 2013 GW Palmer [Member] TL	Sep. 18, 2013 YES Trans [Member]	Dec. 31, 2013 YES Trans [Member]	Dec. 31, 2013 YES Trans [Member] 2014	Dec. 31, 2013 YES Trans [Member] 2015	Dec. 31, 2013 YES Trans [Member] 2016	Dec. 31, 2013 YES Trans [Member] 2017	Sep. 18, 2013 YES Trans [Member] TL
Business Acquisition [Line Items]
Date of acquisition		Aug. 31, 2011		Feb. 24, 2012					Apr. 19, 2012								Jun. 04, 2012						Aug. 01, 2012							Aug. 10, 2012								Dec. 21, 2012						Nov. 05, 2012							Nov. 12, 2012							Apr. 30, 2013		Apr. 30, 2013							Jul. 25, 2013					Aug. 15, 2013		Sep. 11, 2013								Sep. 18, 2013
Consideration Transferred	$ 96.8		$ 6.2					$ 11.4								$ 7.6						$ 24.2							$ 10.0								$ 1.0						$ 3.8							$ 24.1							$ 9.0		$ 14.2							$ 66.0					$ 1.2		$ 2.5								$ 1.2
Acquisition financed with Company's stock	3.0
Contingent Consideration Arrangements, Basis					1.8	1.8			5.0	2.0	2.0	2.0						2.0	2.0	2.0				1.7	4.5	4.5	4.5				0.9	2.3	2.5	2.5	2.8				0.4	0.4	0.4				1.4	1.8	1.8	1.8				3.0	3.0	3.0	3.0						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, Low														0.1
Contingent Consideration Arrangements, Range of Outcomes, Value, High				0.8									0.7				3.5						5.0							4.0								1.0						4.0	0.8						2.5									6.5							2.5							2.8	0.7							1.1
Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability							$ 0.7								$ 1.0						$ 2.6							$ 4.2								$ 3.1						$ 1.0							$ 3.4							$ 2.2									$ 4.3					$ 0										$ 0							$ 0