Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Schedule of financial data of reportable segments

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Revenues:
LTL	$	144,190		$	132,451		$	423,426		$	381,121
TL	170,102			124,212			477,878			333,284
TMS	50,921			23,955			99,331			67,762
Eliminations	(2,057		)	(1,453		)	(6,191		)	(3,883		)
Total	363,156			279,165			994,444			778,284
Operating income:
LTL	10,907			10,015			31,693			28,919
TL	10,843			7,321			31,862			19,812
TMS	4,634			2,746			10,923			7,723
Corporate	(2,725		)	(2,077		)	(7,284		)	(5,236		)
Total operating income	23,659			18,005			67,194			51,218
Interest expense	2,078			1,943			5,563			5,861
Income before provision for income taxes	$	21,581		$	16,062		$	61,631		$	45,357
Depreciation and amortization:
LTL	$	614		$	627		$	2,396		$	1,688
TL	3,057			1,603			8,071			4,247
TMS	291			194			643			574
Corporate	67			—			120			—
Total	$	4,029		$	2,424		$	11,230		$	6,509
Capital expenditures:
LTL	$	2,348		$	1,802		$	5,061		$	5,661
TL	3,552			3,406			19,136			6,302
TMS	130			6			182			63
Corporate	—			—						—
Total	$	6,030		$	5,214		$	24,379		$	12,026

	September 30, 2013			December 31, 2012
Assets:
LTL	$	582,357		$	490,067
TL	384,008			339,890
TMS	156,553			61,076
Eliminations	(268,677		)	(190,225		)
	$	854,241		$	700,808