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Liability for Warranty Returns - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Product Warranties Disclosures [Abstract]            
Period of warranty for product defects 90 days to five years          
Liability for warranty obligations $ 10,939 $ 9,180 $ 8,548 $ 8,752 $ 8,935 $ 8,739