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Product Warranties - Product Warranty Activities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Guarantees [Abstract]    
Beginning balance $ 10,104 $ 8,261
Provision for product warranties 15,987 15,884
Direct and other charges to warranty liability (15,692) (14,041)
Ending balance $ 10,399 $ 10,104