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Schedule of Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite Lived Intangible Assets Future Amortization Expense [Line Items]    
2015 $ 1,355us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 1,159us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 1,084us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 982us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 798us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 3,731us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Amortizable intangible assets, net Intangible $ 9,109us-gaap_FiniteLivedIntangibleAssetsNet $ 8,112us-gaap_FiniteLivedIntangibleAssetsNet