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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Accounting Policies [Line Items]          
Prepaid Expense, Current   $ 24,400 $ 8,400    
Disposal Group, Including Discontinued Operation, Assets   5,800      
General And Administrative Expenses Cost Of Goods Sold Depreciation   15,900 16,000 $ 16,500  
Capital Leases, Balance Sheet, Assets by Major Class, Net   4,300 5,000    
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation   1,900 2,600    
Amortization Of Intangible Assets   19,940 21,259 21,878  
Estimated amortization expense for 2017   16,900      
Estimated amortization expense for 2018   15,400      
Estimated amortization expense for 2019   14,500      
Estimated amortization expense for 2020   13,700      
Estimated amortization expense for 2021   12,000      
Impairment of goodwill $ 1,700 1,663 1,087    
Capitalized Computer Software, Net   5,400 2,700    
Research and Development Expense   6,400 4,800 1,700  
Capitalized Computer Software, Amortization   1,000 700 500  
Retail          
Accounting Policies [Line Items]          
Disposal Group, Including Discontinued Operation, Goodwill         $ 500
Commercial Trailer Products          
Accounting Policies [Line Items]          
Impairment of goodwill $ 1,700        
Goodwill, Period Increase (Decrease)   2,600 2,600    
Used Trailers          
Accounting Policies [Line Items]          
Accounts Payable, Trade     2,100    
Property, Plant and Equipment, Additions   4,600 12,800 $ 26,800  
Property Plant And Equipment Net Realizable Value   $ 0 $ 10,000    
Building and Building Improvements          
Accounting Policies [Line Items]          
Property, Plant and Equipment, Useful Life   33 years