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Intangible assets, net - Summary of Estimated Amortization Expense on Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]  
2015 $ 1,182us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 1,030us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 879us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 726us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 574us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter $ 1,110us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive