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Warranties - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Guarantor Obligations [Line Items]    
Warranty reserve balance $ 4.9 $ 2.4
Minimum [Member]    
Guarantor Obligations [Line Items]    
Warranty term 2 years  
Maximum [Member]    
Guarantor Obligations [Line Items]    
Warranty term 5 years