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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Product Warranty Liability [Line Items]      
Balance at beginning of period $ 30,677 $ 27,422 $ 24,438
Deferral of new extended warranty revenue 41,694 23,271 23,753
Recognition of extended warranty deferred revenue (20,442) (20,016) (20,769)
Balance at end of period $ 51,929 $ 30,677 $ 27,422