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Note 10 - Business Segments (Detail) - Operating Revenue and Operating Income by Segment (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Operating Income	$ 13,283		$ 11,359		$ 22,802		$ 18,968
Truckload Revenue, Net of Fuel Surcharge [Member]
Revenues	94,148		89,637		183,346		171,610
Truckload Fuel Surcharge Revenue [Member]
Revenues	26,121		25,526		51,374		47,614
Total Truckload Revenue [Member]
Revenues	120,269		115,163		234,720		219,224
Logistics Revenue, Net of Intermodal Fuel Surcharge [Member]
Revenues	33,045	[1]	32,203	[1]	66,481	[1]	62,721	[1]
Intermodal Fuel Surcharge Revenue [Member]
Revenues	3,650		3,769		7,237		7,046
Total Logistics Revenue [Member]
Revenues	36,695		35,972		73,718		69,767
Total [Member]
Revenues	156,964		151,135		308,438		288,991
Operating Income	13,283		11,359		22,802		18,968
Truckload [Member]
Operating Income	10,973		9,602		18,101		14,923
Logistics [Member]
Operating Income	$ 2,310		$ 1,757		$ 4,701		$ 4,045
[1] Logistics revenue is net of $2.4 million and $4.9 million of inter-segment revenue in the three-month and six-month periods ended June 30, 2012, respectively, for loads transported by our tractors and arranged by MWL that have been eliminated in consolidation. Inter-segment revenue was $2.1 million and $4.4 million for the three-month and six-month periods ended June 30, 2011.

X

- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration