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Summary of Changes in Total Deferred Revenue (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Deferred Revenue Arrangement [Line Items]    
Balance at Beginning of Period $ 117,064 $ 143,853
Reduction from Licensing Revenue Recognized 20,037 20,037
Balance at End of Period $ 97,027 $ 123,816