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Product Warranties - Product Warranty Activities (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Guarantees [Abstract]    
Beginning of period $ 10,104 $ 8,261
Provision for product warranties 5,184 3,014
Direct and other charges to warranty liability (4,073) (2,790)
End of period $ 11,215 $ 8,485