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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
Dec. 31, 2014
Amortized Cost  
Mature in one year or less $ 72,390us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Mature after one year through two years 750us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost
Total amortized cost 73,140us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Estimated Fair Value  
Mature in one year or less 72,391us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Mature after one year through two years 750us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Total estimated fair value $ 73,141us-gaap_AvailableForSaleSecuritiesDebtSecurities