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Deferred Revenue and Customer Advances (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred Revenue Arrangement |  |
Customer advances | $ 29,951 | $ 39,613
Maintenance, training and extended warranty | 50,021 | 51,198
Undelivered elements | 7,466 | 6,773
Total deferred revenue and customer advances | $ 87,438 | $ 97,584

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- Definition Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15a) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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