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Goodwill and Intangible Assets - Estimated Amortization Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 $ 2,325us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 1,333us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 1,275us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 1,275us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 1,275us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter 738us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Total $ 8,221us-gaap_FiniteLivedIntangibleAssetsNet