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Other Intangible Assets - Estimated Future Amortization Expense Related to Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2015 $ 379us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 326us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 281us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 241us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 207us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 646us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total $ 2,080us-gaap_FiniteLivedIntangibleAssetsNet $ 1,171us-gaap_FiniteLivedIntangibleAssetsNet