Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Total Amounts of Unrecognized Tax Benefits Excluding Interest and Penalties (Detail)

v2.4.1.9
Income Taxes - Reconciliation of Total Amounts of Unrecognized Tax Benefits Excluding Interest and Penalties (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Balance at Beginning of the Year $ 1,940us-gaap_UnrecognizedTaxBenefits $ 840us-gaap_UnrecognizedTaxBenefits $ 880us-gaap_UnrecognizedTaxBenefits
Increases (Decreases) as a Result of Tax Positions Taken in Prior Years (1,901)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 145us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (220)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Increases as a Result of Tax Positions Taken in the Current Year 142us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 955us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 180us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Balance at End of the Year $ 181us-gaap_UnrecognizedTaxBenefits $ 1,940us-gaap_UnrecognizedTaxBenefits $ 840us-gaap_UnrecognizedTaxBenefits