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Long-Term Debt and Financing Arrangements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 Chassis
Schedule Of Debt [Line Items] |  |  |
Maximum unsecured borrowing capacity | $ 50.0 |  |
Line of credit, expiration date | Dec. 31, 2018 |  |
Number of chassis leased |  |  | 3,126
Chassis, lease agreement period (years) |  |  | 10 years
Capital lease interest paid | 0.9 | 1.0 | 0.3
Minimum [Member] |  |  |
Schedule Of Debt [Line Items] |  |  |
Commitment fee charged on the unused line of credit | 0.10% |  |
Maximum [Member] |  |  |
Schedule Of Debt [Line Items] |  |  |
Commitment fee charged on the unused line of credit | 0.25% |  |
Total leverage ratio | 3.00% |  |
Interest coverage ratio | 1.00% |  |
Standby Letters of Credit [Member] |  |  |
Schedule Of Debt [Line Items] |  |  |
Outstanding letters of credit | 5.2 |  |
Letters of credit expiration, year | 2014 |  |
Revolving Line of Credit Facility [Member] |  |  |
Schedule Of Debt [Line Items] |  |  |
Unused and available borrowings under bank revolving line of credit | 44.8 | 46.3 |
Equipment Note [Member] |  |  |
Schedule Of Debt [Line Items] |  |  |
Notes, expiration, start date | May 14, 2018 |  |
Notes, expiration, end date | Jun. 19, 2018 |  |
Notes, fixed interest rate, minimum | 1.90% |  |
Notes, fixed interest rate, maximum | 2.00% |  |
Notes, quarterly principal and interest payments | $ 0.5 |  |
Notes, number of tractors financing | 80 |  |
LIBOR rate [Member] | Minimum [Member] |  |  |
Schedule Of Debt [Line Items] |  |  |
Interest rate under the Credit Agreement | 1.00% |  |
LIBOR rate [Member] | Maximum [Member] |  |  |
Schedule Of Debt [Line Items] |  |  |
Interest rate under the Credit Agreement | 1.75% |  |
Prime Rate [Member] |  |  |
Schedule Of Debt [Line Items] |  |  |
Interest rate under the Credit Agreement | 0.75% |  |

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