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Product Warranties - Product Warranty Activities (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Guarantees [Abstract]    
Beginning of period $ 10,104 $ 8,261
Provision for product warranties 11,448 11,941
Direct and other charges to warranty liability (11,072) (10,080)
End of period $ 10,480 $ 10,122