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Investments - Schedule of Available-for-Sale Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Amortized Cost and Fair Value Debt Securities [Abstract]    
Original stated term to maturity of available-for-sale- investments, Less than one year $ 77,177us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue $ 31,592us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Original stated term to maturity of available-for-sale- investments, One to five years 44,182us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Original stated term to maturity of available-for-sale- investments, Five to ten years 211us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Original stated term to maturity of available-for-sale- investments, Greater than ten years 8,662us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue 7,374us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Original stated term to maturity of available-for-sale- investments, Total $ 130,232us-gaap_AvailableForSaleSecurities $ 38,966us-gaap_AvailableForSaleSecurities