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Note 4 - Segment Reporting (Detail) - Amortization and Depreciation by Reporting Segments (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Depreciation and Amortization by Segments	$ 10,915	$ 11,157
Trucking [Member]
Depreciation and Amortization by Segments	10,254	10,407
SCS [Member]
Depreciation and Amortization by Segments	30	27
Intermodal [Member]
Depreciation and Amortization by Segments	49	93
Corporate and Other [Member]
Depreciation and Amortization by Segments	$ 582	$ 630

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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