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 |