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Product Warranties - Product Warranty Activities (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Guarantees [Abstract]    
Beginning of period $ 10,104 $ 8,261
Provision for product warranties 8,484 7,555
Direct and other charges to warranty liability (7,328) (6,084)
End of period $ 11,260 $ 9,732