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Acquisitions - Schedule of Intangible Assets Acquired (Parenthetical) (Detail)
Jan. 12, 2018
Apr. 25, 2017
Apr. 13, 2017
Lance Camper Mfg. Corp. [Member] | Order Customer Relationships [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets, useful life 6 years    
Lance Camper Mfg. Corp. [Member] | Order Backlog [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets, useful life 1 year    
Lance Camper Mfg. Corp. [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Acquired indefinite intangible assets, useful life indefinite life    
Ferrara Fire Apparatus, Inc. [Member] | Order Customer Relationships [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets, useful life   12 years  
Ferrara Fire Apparatus, Inc. [Member] | Order Backlog [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets, useful life   1 year  
Ferrara Fire Apparatus, Inc. [Member] | Non-compete Agreements [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets, useful life   4 years  
Ferrara Fire Apparatus, Inc. [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Acquired indefinite intangible assets, useful life   indefinite life  
Midwest Automotive Designs [Member] | Order Customer Relationships [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets, useful life     6 years
Midwest Automotive Designs [Member] | Order Backlog [Member]      
Business Acquisition [Line Items]      
Acquired intangible assets, useful life     1 year
Midwest Automotive Designs [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Acquired indefinite intangible assets, useful life     indefinite life