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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
Jun. 30, 2014
Amortized Cost  
Mature in one year or less $ 89,404
Mature after one year through two years 47,838
Total amortized cost 137,242
Estimated Fair Value  
Mature in one year or less 89,428
Mature after one year through two years 47,853
Total estimated fair value $ 137,281