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Note 1. Summary of Significant Accounting Policies (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Assets (in Dollars) | 490,623,000 | 470,579,000 |
Liabilities (in Dollars) | 158,700,000 | 150,220,000 |
Letters of Credit Outstanding, Amount (in Dollars) | 7,400,000 |  |
Number of Operating Segments | 6 | 6 |
Number of Reportable Segments | 2 | 2 |
Customer 1 [Member] | Accounts Receivable [Member] |  |  |
Concentration Risk, Percentage |  | 11.00% |
Customer 1 [Member] |  |  |
Entity-Wide Revenue, Major Customer, Percentage | 9.00% | 11.00% | 18.00%
Customer 2 [Member] | Accounts Receivable [Member] |  |  |
Concentration Risk, Percentage |  | 8.00% |
Customer 2 [Member] |  |  |
Entity-Wide Revenue, Major Customer, Percentage |  | 10.00% | 10.00%
Insurance Claims [Member] |  |  |
Letters of Credit Outstanding, Amount (in Dollars) | 7,400,000 |  |
Tractors [Member] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 25.00% |  |
Trailers [Member] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Property, Plant and Equipment, Salvage Value, Percentage | 35.00% |  |
Service and other equipment [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Service and other equipment [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 20 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |
Tires In Service [Member] |  |  |
Property, Plant and Equipment, Useful Life | 24 months |  |
Geographic Concentration Risk [Member] | United States [Member] | Revenue [Member] |  |  |
Concentration Risk, Percentage | 99.00% |  |
MWL [Member] |  |  |
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 45.00% |  |
Assets (in Dollars) | 5,200,000 |  |
Liabilities (in Dollars) | 2,700,000 |  |

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