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Long-Term Debt and Financing Arrangements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 01, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2011
Schedule Of Debt [Line Items] |  |  |  |
Maximum unsecured borrowing capacity |  | $ 50.0 |  | $ 10.0
Interest rate under the Credit Agreement |  | 1.75% |  |
Line of credit, expiration date |  | March 2014 |  |
Minimum net worth |  | 300.0 |  |
Commitment fee charged on the unused line of credit |  | 0.375% |  |
Outstanding letters of credit |  | 3.7 |  |
Letter of credit expiration, year |  | 2013 |  |
Unused and available borrowings under bank revolving line of credit |  | 46.3 | 47.4 |
Number of chassis leased | 3,126 |  |  |
Chassis, lease agreement period (years) | 10 years |  |  |
Capital lease interest paid |  | $ 1.0 | $ 0.3 |
Maximum |  |  |  |
Schedule Of Debt [Line Items] |  |  |  |
Cash flow leverage ratio |  | 2.0 |  |

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- Details
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