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Liability for Warranty Returns - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Product Warranties Disclosures [Abstract]            
Period of assurance-based warranty for product defects 90 days to five years          
Liability for warranty obligations $ 9,024 $ 10,111 $ 9,724 $ 10,939 $ 9,180 $ 8,548