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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Schedule Of Goodwill And Other Intangible Asset [Line Items]  
Amortization expenses of intangible assets, 2016 $ 482us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Amortization expenses of intangible assets, 2017 473us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Amortization expenses of intangible assets, 2018 448us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Amortization expenses of intangible assets, 2019 447us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Amortization expenses of intangible assets, 2020 223us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Amortization expenses of intangible assets, After 2020 444us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Increase (decrease) in goodwill (500)us-gaap_GoodwillPeriodIncreaseDecrease
Deferred Tax Assets [Member]  
Schedule Of Goodwill And Other Intangible Asset [Line Items]  
Increase (decrease) in goodwill $ 600us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember