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Long-Term Debt and Financing Arrangements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
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%