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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 28, 2013
Dec. 31, 2013
Retail
Dec. 31, 2012
Retail
Dec. 31, 2013
Used Trailers
Dec. 31, 2012
Used Trailers
Dec. 31, 2011
Used Trailers
Dec. 31, 2013
Building and Building Improvements
Dec. 31, 2013
Machinery and Equipment
Maximum
Dec. 31, 2013
Machinery and Equipment
Minimum
Feb. 29, 2012
Manufacturing Facility In Cadiz Kentucky
Dec. 31, 2013
Manufacturing Facility In Cadiz Kentucky
Dec. 31, 2013
Software
Maximum
Dec. 31, 2013
Software
Minimum
Accounting Policies [Line Items]                                
Property, plant and equipment, additions             $ 26,200,000 $ 19,500,000 $ 16,200,000              
Accounts payable, trade             15,600,000 10,800,000                
Property plant and equipment net realizable value             15,300,000 10,800,000                
Prepaid expenses and other 9,600,000 8,200,000                            
Restricted cash and cash equivalents   2,500,000                            
Property, plant and equipment, estimated useful                   33 years 10 years 3 years     7 years 3 years
General and administrative expenses cost of goods sold depreciation 15,700,000 12,700,000 10,200,000                          
Capital lease expiration period                           10 years    
The Company entered into a non-cash capital lease obligation for its manufacturing facility in Cadiz, Kentucky 6,851,000 3,781,000                     2,700,000      
Capital lease obligation cash payment at closing                         800,000      
Capital lease agreements, net 10,900,000 6,500,000                            
Accumulated depreciation, net 2,400,000 1,400,000                            
Amortization expense 21,786,000 10,590,000 2,955,000                          
Estimated amortization expense for 2014 21,900,000                              
Estimated amortization expense for 2015 21,300,000                              
Estimated amortization expense for 2016 20,100,000                              
Estimated amortization expense for 2017 16,900,000                              
Estimated amortization expense for 2018 15,500,000                              
Changes in the carrying amounts of goodwill         10,200,000 10,200,000                    
Amortization expense 700,000 2,300,000 2,300,000                          
Research and development expense 2,200,000 1,700,000 1,000,000                          
Capitalized software costs, net of amortization 200,000 900,000                            
Capital lease agreement, Obligation amount       4,300,000                        
Goodwill, impairment loss $ 0 $ 0 $ 0