Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Rollforward of goodwill by reportable segment

	LTL			TL			TMS		Total
Goodwill balance as of December 31, 2012	$	197,456		$	202,547		$	42,140	$	442,143
Adjustments to goodwill for purchase accounting	(143		)	(3,183		)	4		(3,322		)
Acquisitions	—			8,248			68,793		77,041
Goodwill balance as of September 30, 2013	$	197,313		$	207,612		$	110,937	$	515,862

Intangible assets

	September 30, 2013							December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Gross Carrying Amount		Accumulated Amortization			Net Carrying Value
Customer relationships - TL	$	17,950	$	(4,829	)	$	13,121	$	15,115	$	(3,430	)	$	11,685
Customer relationships - LTL	1,358		(667		)	691		1,358		(497		)	861
Customer relationships - TMS	11,352		(557		)	10,795		626		(462		)	164
Total customer relationships	$	30,660	$	(6,053	)	$	24,607	$	17,099	$	(4,389	)	$	12,710

Estimated amortization expense

Remainder 2013	$	869
2014	3,576
2015	3,379
2016	3,287
2017	3,166
2018	2,877
Thereafter	7,453
Total	$	24,607