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Acquisition of supreme industries, Inc.- Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Sep. 27, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Business Combination, Acquisition Related Costs   $ 68 $ 0  
Finite-Lived Intangible Assets, Amortization Expense, Year Five       $ 19,500
Goodwill   317,778   317,464
Goodwill, Period Increase (Decrease)   400    
Senior Notes [Member]        
Debt Instrument, Face Amount $ 325,000      
Debt Instrument, Interest Rate, Stated Percentage 5.50%      
Supreme Industries Inc. [Member]        
Business Acquisition, Share Price $ 21      
Business Combination, Acquisition Related Costs   100    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 161,200      
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months       20,400
Finite-Lived Intangible Assets, Amortization Expense, Year Two       21,600
Finite-Lived Intangible Assets, Amortization Expense, Year Three       23,100
Finite-Lived Intangible Assets, Amortization Expense, Year Four       $ 24,400
Goodwill 169,621      
Revenues   72,200    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ 2,100    
Class A and Class B [Member]        
Payments to Acquire Businesses, Gross 360,400      
Class A and Class B [Member] | Supreme Industries Inc. [Member]        
Payments to Acquire Businesses, Gross $ 360,400