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Intangible Assets - Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 $ 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 371us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 2,357us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total $ 4,212us-gaap_FiniteLivedIntangibleAssetsNet $ 2,577us-gaap_FiniteLivedIntangibleAssetsNet