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Components of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Deferred Revenue Arrangement [Line Items]
Future service	$ 27,324	$ 25,809
Estimated potential penalties and holdbacks	9,889	8,510
Deferred revenue	$ 37,213	$ 34,319

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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