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Acquisition of supreme industries, Inc. - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 27, 2017
Sep. 26, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Business Combination, Acquisition Related Costs     $ 8,704 $ 0 $ 8,704 $ 0    
Goodwill     313,626 $ 148,285 313,626 $ 148,285 $ 148,367 $ 149,718
Senior Notes [Member]                
Proceeds from Issuance of Senior Long-term Debt $ 325,000 $ 318,900            
Debt Instrument, Interest Rate, Stated Percentage 5.50%              
Debt Instrument, Maturity Date Oct. 01, 2025 Oct. 01, 2025            
Supreme Industries Inc. [Member]                
Business Acquisition, Share Price $ 21              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 158,000              
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months     18,300   18,300      
Finite-Lived Intangible Assets, Amortization Expense, Year Two     20,000   20,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Three     21,900   21,900      
Finite-Lived Intangible Assets, Amortization Expense, Year Four     23,400   23,400      
Finite-Lived Intangible Assets, Amortization Expense, Year Five     $ 24,700   $ 24,700      
Goodwill 165,400              
Class A and Class B [Member] | Supreme Industries Inc. [Member]                
Payments to Acquire Businesses, Gross $ 360,400