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Intangible Assets Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
2015 $ 646us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 646us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 646us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 646us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 646us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 6,833us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net $ 10,063us-gaap_FiniteLivedIntangibleAssetsNet $ 10,709us-gaap_FiniteLivedIntangibleAssetsNet