Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Rollforward of goodwill by reportable segment

	TL		LTL		TMS			Total
Goodwill balance as of December 31, 2013	$	211,413	$	197,312	$	110,018		$	518,743
Adjustments to goodwill for purchase accounting	—		—		(206		)	(206		)
Goodwill related to acquisitions	110,656		—		38,936			149,592
Goodwill balance as of September 30, 2014	$	322,069	$	197,312	$	148,748		$	668,129

Intangible assets

	September 30, 2014							December 31, 2013
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Value		Gross Carrying Amount		Accumulated Amortization			Net Carrying Value
TL	$	44,826	$	(6,902	)	$	37,924	$	17,826	$	(5,294	)	$	12,532
LTL	1,358		(893		)	465		1,358		(723		)	635
TMS	31,522		(2,780		)	28,742		19,522		(1,326		)	18,196
Total	$	77,706	$	(10,575	)	$	67,131	$	38,706	$	(7,343	)	$	31,363

Estimated amortization expense

Remainder 2014	$	1,943
2015	7,727
2016	7,635
2017	7,514
2018	7,249
2019	6,946
Thereafter	28,117
Total	$	67,131