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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
2014 $ 156  
2015 148  
2016 141  
2017 137  
2018 127  
Thereafter 692  
Amortized intangible assets, Net Carrying Amount $ 1,401 $ 1,463