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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Product Warranty Liability [Line Items]      
Balance at beginning of period $ 46,499 $ 43,300 $ 34,909
Acquisition   870  
Deferral of new extended warranty revenue 27,182 28,549 29,519
Recognition of extended warranty deferred revenue (26,928) (26,220) (21,128)
Balance at end of period $ 46,753 $ 46,499 $ 43,300