Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Schedule of financial data of reportable segments

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014			2013
Revenues:
TL	$	262,865		$	170,102		$	687,539		$	477,878
LTL	151,069			144,190			436,232			423,426
TMS	87,240			50,921			225,695			99,331
Eliminations	(3,088		)	(2,057		)	(9,168		)	(6,191		)
Total	498,086			363,156			1,340,298			994,444
Operating income:
TL	$	18,474		$	10,843		$	46,500		$	31,862
LTL	5,478			10,907			20,154			31,693
TMS	6,708			4,634			16,273			10,923
Corporate	(5,380		)	(2,725		)	(11,455		)	(7,284		)
Total operating income	25,280			23,659			71,472			67,194
Interest expense	3,827			2,078			8,936			5,563
Income before provision for income taxes	$	21,453		$	21,581		$	62,536		$	61,631
Depreciation and amortization:
TL	$	4,266		$	3,057		$	11,050		$	8,071
LTL	912			614			2,531			2,396
TMS	866			291			2,333			643
Corporate	275			67			874			120
Total	$	6,319		$	4,029		$	16,788		$	11,230
Capital expenditures:
TL	$	5,299		$	3,552		$	21,180		$	19,136
LTL	2,975			1,651			5,532			3,611
TMS	261			130			1,278			182
Corporate	540			697			2,566			1,450
Total	$	9,075		$	6,030		$	30,556		$	24,379

	September 30, 2014			December 31, 2013
Assets:
TL	$	655,543		$	388,262
LTL	831,717			576,976
TMS	235,762			162,718
Corporate	4,716			—
Eliminations	(480,337		)	(256,076		)
	$	1,247,401		$	871,880