Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Schedule of financial data of reportable segments

	2012			2011			2010
Revenues:
LTL	$	511,006		$	466,823		$	409,914
TL	476,638			301,279			158,724
TMS	91,558			79,188			65,902
Eliminations	(5,848		)	(3,663		)	(2,522		)
Total	1,073,354			843,627			632,018
Operating Income:
LTL	35,502			24,325			21,661
TL	30,070			20,040			6,459
TMS	10,534			7,601			5,284
Corporate	(7,156		)	(5,831		)	(3,635		)
Total operating income	68,950			46,135			29,769
Interest expense	8,030			4,335			8,154
Loss on early extinguishment of debt	—			—			15,916
Income before provision for income taxes	$	60,920		$	41,800		$	5,699
Depreciation and Amortization:
LTL	$	2,422		$	1,718		$	1,676
TL	6,306			2,572			744
TMS	771			688			694
Total	$	9,499		$	4,978		$	3,114
Capital Expenditures:
LTL	$	8,213		$	4,817		$	1,323
TL	8,581			4,296			987
TMS	95			992			190
Total	$	16,889		$	10,105		$	2,500

	December 31,
	2012			2011			2010
Total Assets:
LTL	$	490,067		$	397,372		$	259,706
TL	339,890			222,264			49,533
TMS	61,076			46,290			44,905
Eliminations	(190,225		)	(122,208		)	(5,847		)
Total	$	700,808		$	543,718		$	348,297