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Summary of Amortized Cost and Estimated Fair Value of Marketable Securities Available-for-Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Amortized Cost  
Mature in one year or less $ 96,598
Mature after one year through two years 14,280
Total amortized cost 110,878
Estimated Fair Value  
Mature in one year or less 96,635
Mature after one year through two years 14,281
Total estimated fair value $ 110,916