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Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Deferred Revenue Arrangement |  |  |  |
Maintenance, service and training | $ 77,654 | $ 63,815 |  |
Customer advances, undelivered elements and other | 63,438 | 56,358 |  |
Extended warranty | 51,929 | 30,677 | $ 27,422 | $ 24,438
Total deferred revenue and customer advances | $ 193,021 | $ 150,850 |  |

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- Definition Deferred revenue and customer advances maintenance service and training. + References No definition available. + Details
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- Definition Deferred revenue and customer advances undelivered elements and other. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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