Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Intangible assets
Net Carrying Value	$ 24,607
Customer relationships [Member]
Intangible assets
Gross Carrying Amount	30,660	17,099
Accumulated Amortization	(6,053)	(4,389)
Net Carrying Value	24,607	12,710
Customer relationships [Member] | Customer relationships - TL [Member]
Intangible assets
Gross Carrying Amount	17,950	15,115
Accumulated Amortization	(4,829)	(3,430)
Net Carrying Value	13,121	11,685
Customer relationships [Member] | Customer relationships - LTL [Member]
Intangible assets
Gross Carrying Amount	1,358	1,358
Accumulated Amortization	(667)	(497)
Net Carrying Value	691	861
Customer relationships [Member] | Customer Relationships - TMS [Member]
Intangible assets
Gross Carrying Amount	11,352	626
Accumulated Amortization	(557)	(462)
Net Carrying Value	$ 10,795	$ 164