Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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	—		(905		)	—		(905		)
Acquisition	—		429			—		429
Goodwill balance as of March 31, 2013	$	197,456	$	202,071		$	42,140	$	441,667

Intangible assets

	March 31, 2013							December 31, 2012
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Gross Carrying Amount		Accumulated Amortization			Net Carrying Value
Customer relationships - TL	$	15,994	$	(3,876	)	$	12,118	$	15,115	$	(3,430	)	$	11,685
Customer relationships - LTL	1,358		(553		)	805		1,358		(497		)	861
Customer relationships - TMS	626		(490		)	136		626		(462		)	164
Total customer relationships	$	17,978	$	(4,919	)	$	13,059	$	17,099	$	(4,389	)	$	12,710

Estimated amortization expense

	Amount
Remainder 2013	$	1,581
2014	2,088
2015	1,891
2016	1,800
2017	1,679
2018	1,415
Thereafter	2,605
Total	$	13,059