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Other Accrued Liabilities - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2012
Accrued Liabilities [Line Items]  
Extended product warranty period for DuraPlate trailer panels 10 years
Minimum
  
Accrued Liabilities [Line Items]  
Product warranty period 1 year
Maximum
  
Accrued Liabilities [Line Items]  
Product warranty period 5 years