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Intangible Assets - Estimated Amortization (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2015 $ 768us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 666us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 664us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 661us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 519us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 687us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Estimated amortization $ 3,965us-gaap_FiniteLivedIntangibleAssetsNet $ 3,288us-gaap_FiniteLivedIntangibleAssetsNet