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Extended Product Warranty of Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Product Warranty Liability [Line Items]      
Balance at beginning of period $ 24,438 $ 28,200 $ 30,024
Deferral of new extended warranty revenue 23,753 20,513 19,909
Recognition of extended warranty deferred revenue (20,769) (24,275) (21,733)
Balance at end of period $ 27,422 $ 24,438 $ 28,200