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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 $ 178us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 172us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 167us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 158us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 148us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 759us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total $ 1,582us-gaap_FiniteLivedIntangibleAssetsNet $ 1,401us-gaap_FiniteLivedIntangibleAssetsNet