Note 19 - Segments (Detail) - Segment Reporting Information (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
2012
Revenues from external customers, by segment	$ 3,090,567	$ 2,580,611	$ 1,497,927
Interest income, by segment	21	20	127
Interest expense, by segment	13,038	7,181	5,490
Depreciation and amortization, by segment	25,016	20,084	15,720
Segment income (loss) from continuing operations before taxes, by segment	101,183	90,177	36,304
Segment assets, by segment	1,881,566	1,717,701	1,167,933
Goodwill, by segment	198,257	182,612	150,388
Expenditures for segment assets, by segment	170,951	148,543	84,303
Truck Segment [Member]
2012
Revenues from external customers, by segment	3,072,092	2,562,740	1,482,742
Interest income, by segment	21	20	127
Interest expense, by segment	12,830	6,876	5,092
Depreciation and amortization, by segment	24,482	19,471	15,019
Segment income (loss) from continuing operations before taxes, by segment	102,392	91,820	37,690
Segment assets, by segment	1,855,431	1,691,938	1,143,385
Goodwill, by segment	195,697	180,052	147,828
Expenditures for segment assets, by segment	170,436	148,384	83,670
All Other Segments [Member]
2012
Revenues from external customers, by segment	18,475	17,871	15,185
Interest expense, by segment	208	305	398
Depreciation and amortization, by segment	534	613	701
Segment income (loss) from continuing operations before taxes, by segment	(1,209)	(1,643)	(1,386)
Segment assets, by segment	26,135	25,763	24,548
Goodwill, by segment	2,560	2,560	2,560
Expenditures for segment assets, by segment	$ 515	$ 159	$ 633

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Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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Income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money.

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Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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