Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Schedule of financial data of reportable segments

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Revenues:
LTL	$	146,545		$	129,717		$	279,236		$	248,670
TL	161,235			111,045			307,776			209,072
TMS	26,967			23,127			48,410			43,807
Eliminations	(2,839		)	(1,343		)	(4,134		)	(2,430		)
Total	331,908			262,546			631,288			499,119
Operating income:
LTL	11,808			10,454			20,786			18,904
TL	11,351			6,829			21,019			12,491
TMS	3,966			2,765			6,289			4,977
Corporate	(2,727		)	(1,475		)	(4,559		)	(3,159		)
Total operating income	24,398			18,573			43,535			33,213
Interest expense	1,610			2,071			3,485			3,918
Income before provision for income taxes	$	22,788		$	16,502		$	40,050		$	29,295
Depreciation and amortization:
LTL	$	1,004		$	546		$	1,782		$	1,061
TL	2,617			1,385			5,014			2,644
TMS	189			194			352			380
Corporate	36			—			53			—
Total	$	3,846		$	2,125		$	7,201		$	4,085
Capital expenditures:
LTL	$	837		$	1,272		$	1,960		$	3,859
TL	8,231			2,252			16,180			2,896
TMS	28			29			52			57
Corporate	406			—			753			—
Total	$	9,502		$	3,553		$	18,945		$	6,812

	June 30, 2013			December 31, 2012
Assets:
LTL	$	519,771		$	490,067
TL	376,133			339,890
TMS	74,549			61,076
Eliminations	(208,705		)	(190,225		)
	$	761,748		$	700,808