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Deferred Revenue and Customer Advances (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred Revenue Arrangement |  |
Customer advances | $ 39,613 | $ 70,001
Maintenance, training and extended warranty | 51,198 | 33,953
Undelivered elements | 6,773 | 7,939
Acceptance |  | 318
Total deferred revenue and customer advances | $ 97,584 | $ 112,211

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