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Acquisitions - Schedule of Intangible Assets Acquired (Detail) - USD ($)
$ in Millions
Jan. 12, 2018
Apr. 25, 2017
Apr. 13, 2017
Lance Camper Mfg. Corp. [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net $ 24.3    
Lance Camper Mfg. Corp. [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net 9.8    
Lance Camper Mfg. Corp. [Member] | Order Customer Relationships [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net 12.7    
Lance Camper Mfg. Corp. [Member] | Order Backlog [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net $ 1.8    
Ferrara Fire Apparatus, Inc. [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net   $ 32.7  
Ferrara Fire Apparatus, Inc. [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net   13.6  
Ferrara Fire Apparatus, Inc. [Member] | Order Customer Relationships [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net   14.4  
Ferrara Fire Apparatus, Inc. [Member] | Order Backlog [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net   3.2  
Ferrara Fire Apparatus, Inc. [Member] | Non-compete Agreements [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net   $ 1.5  
Midwest Automotive Designs [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net     $ 16.5
Midwest Automotive Designs [Member] | Trade Names [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net     3.1
Midwest Automotive Designs [Member] | Order Customer Relationships [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net     12.9
Midwest Automotive Designs [Member] | Order Backlog [Member]      
Business Acquisition [Line Items]      
Total intangible assets, net     $ 0.5