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Extended Product Warranty Included in Short and Long-Term Deferred Revenue and Customer Advances (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Product Warranty Liability [Line Items]      
Balance at beginning of period $ 28,200 $ 30,024 $ 34,197
Acquisition     870
Deferral of new extended warranty revenue 20,513 19,909 17,698
Recognition of extended warranty deferred revenue (24,275) (21,733) (22,741)
Balance at end of period $ 24,438 $ 28,200 $ 30,024