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Deferred Revenue and Customer Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred Revenue Arrangement
Maintenance and training	$ 57,256	$ 46,803
Customer advances, undelivered elements and other	32,047	32,938
Extended warranty	24,438	28,200	$ 30,024	$ 34,197
Total deferred revenue and customer advances	$ 113,741	$ 107,941

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- Definition

Total deferred revenue and customer advances.

+ References

No definition available.

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- Definition

Deferred revenue and customer advances maintenance and training.

+ References

No definition available.

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- Definition

Deferred revenue and customer advances undelivered elements and other.

+ References

No definition available.

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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.

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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://www.xbrl.org/2003/role/presentationRef
-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

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