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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Retail
Dec. 31, 2011
Retail
Dec. 31, 2012
Used Trailers
Dec. 31, 2011
Used Trailers
Dec. 31, 2010
Used Trailers
Dec. 31, 2012
Building and Building Improvements
Dec. 31, 2012
Machinery and Equipment
Minimum
Dec. 31, 2012
Machinery and Equipment
Maximum
Dec. 31, 2012
Manufacturing Facility In Cadiz Kentucky
Feb. 28, 2012
Manufacturing Facility In Cadiz Kentucky
Dec. 31, 2010
Manufacturing Facility In Cadiz Kentucky
Jul. 08, 2008
Manufacturing Facility In Cadiz Kentucky
Dec. 31, 2012
Software
Minimum
Dec. 31, 2012
Software
Maximum
Property, plant and equipment, additions           $ 19,500,000 $ 16,200,000 $ 8,100,000                  
Accounts payable, trade           10,800,000 23,300,000                    
Property plant and equipment net realizable value           10,800,000 23,000,000                    
Prepaid expenses and other 8,200,000 2,300,000                              
Property, plant and equipment, estimated useful                 33 years 3 years 10 years         3 years 7 years
General and administrative expenses cost of goods sold depreciation 12,700,000 10,200,000 11,300,000                            
The Company entered into a non-cash capital lease obligation for its manufacturing facility in Cadiz, Kentucky 3,781,000 3,314,000                     2,700,000 4,700,000 5,300,000    
Capital lease expiration period                       10 years          
Capital lease obligation cash payment at closing                       800,000          
capital lease agreements, net 6,500,000 5,900,000                              
Accumulated depreciation, net 1,400,000 800,000                              
Amortization expense 10,590,000 2,955,000 2,955,000                            
Capitalized software costs, net of amortization 900,000 3,100,000                              
Amortization expense 2,300,000 2,300,000 2,400,000                            
Restricted cash and cash equivalents 2,500,000                                
Estimated amortization expense for 2013 20,800,000                                
Estimated amortization expense for 2014 20,900,000                                
Estimated amortization expense for 2015 20,300,000                                
Estimated amortization expense for 2016 19,100,000                                
Estimated amortization expense for 2017 15,900,000                                
Research and development expense 1,700,000 1,000,000 900,000                            
Changes in the carrying amounts of goodwill       $ 10,200,000 $ 10,200,000