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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
Mar. 31, 2014
Amortized Cost  
Mature in one year or less $ 86,050
Mature after one year through two years 64,841
Total amortized cost 150,891
Estimated Fair Value  
Mature in one year or less 86,070
Mature after one year through two years 64,859
Total estimated fair value $ 150,929