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Contingent Liabilities and Commitments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended
Jun. 01, 2012
Jul. 31, 2013
Jul. 31, 2012
Loss Contingencies [Line Items]      
Repurchase and guarantee reserve balances   $ 3,778 $ 3,150
Chassis delivered to customers in days   90 days  
Additional chassis provided by customers   9,469  
Payments for the benefit of settlement class 4,700    
Discontinued Operations
      
Loss Contingencies [Line Items]      
Chassis consigned inventory   12,650  
Additional chassis provided by customers   $ 9,322