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Business Segments (Tables)

9 Months Ended

Sep. 30, 2011

Business Segments [Abstract]

Summary Of Operating Results

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		Three Months																Three Months
		Ended September 30, 2011																Ended September 30, 2010
										Inter-				Hub												Inter-				Hub
										Segment				Group												Segment				Group
		Hub				Mode				Elims				Total				Hub				Mode				Elims				Total
Revenue		$	560,810			$	205,961			$	(6,392	)		$	760,379			$	478,417			$	—			$	—			$	478,417
Transportation costs			497,204				182,845				(6,392	)			673,657				421,020				—				—				421,020
Gross margin			63,606				23,116				—				86,722				57,397				—				—				57,397
Costs and expenses:
Salaries and benefits			26,884				5,139				—				32,023				25,547				—				—				25,547
Agent fees and commissions			660				13,224				—				13,884				641				—				—				641
General and administrative			10,141				2,471				—				12,612				9,564				—				—				9,564
Depreciation and amortization			1,003				557				—				1,560				938				—				—				938
Total costs and expenses			38,688				21,391				—				60,079				36,690				—				—				36,690
Operating income		$	24,918			$	1,725			$	—			$	26,643			$	20,707			$	—			$	—			$	20,707
Capital expenditures		$	19,996			$	105			$	—			$	20,101			$	11,311			$	—			$	—			$	11,311

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		Nine Months																Nine Months
		Ended September 30, 2011																Ended September 30, 2010
										Inter-				Hub												Inter-				Hub
										Segment				Group												Segment				Group
		Hub				Mode				Elims				Total				Hub				Mode				Elims				Total
Revenue		$	1,606,607			$	407,717			$	(8,857	)		$	2,005,467			$	1,353,824			$	—			$	—			$	1,353,824
Transportation costs			1,423,108				362,434				(8,857	)			1,776,685				1,197,033				—				—				1,197,033
Gross margin			183,499				45,283				—				228,782				156,791				—				—				156,791
Costs and expenses:
Salaries and benefits			81,796				9,774				—				91,570				72,868				—				—				72,868
Agent fees and commissions			2,049				26,351				—				28,400				1,774				—				—				1,774
General and administrative			32,464				5,059				—				37,523				28,640				—				—				28,640
Depreciation and amortization			2,890				1,078				—				3,968				2,845				—				—				2,845
Total costs and expenses			119,199				42,262				—				161,461				106,127				—				—				106,127
Operating income		$	64,300			$	3,021			$	—			$	67,321			$	50,664			$	—			$	—			$	50,664
Capital expenditures		$	35,250			$	132			$	—			$	35,382			$	13,362			$	—			$	—			$	13,362

Schedule Of Assets

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		As of September 30, 2011																As of December 31, 2010
										Inter-				Hub												Inter-				Hub
										Segment				Group												Segment				Group
		Hub				Mode				Elims				Total				Hub				Mode				Elims				Total
Total assets		$	669,980			$	163,814			$	(2,509	)		$	831,285			$	629,407			$	—			$	—			$	629,407
Goodwill		$	233,251			$	29,389			$	—			$	262,640			$	233,029			$	—			$	—			$	233,029

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