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Income Taxes - Schedule of Gross Unrecognized Tax Benefits (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Income Tax Disclosure [Abstract]  
Increase due to Merger $ 16,716us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition
Increases (Decreases) related to current year tax positions (1,859)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions
Balance at end of year $ 14,857us-gaap_UnrecognizedTaxBenefits