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Goodwill and Intangible assets - Estimated Amortization Expense of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
2016 $ 942  
2017 938  
2018 925  
2019 803  
2020 741  
Thereafter 1,597  
Total $ 5,946 $ 1,582