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Estimated Future Amortization Expense of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
2015 $ 2,046us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2016 1,911us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 1,817us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 1,817us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 1,792us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 4,702us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Total estimated future amortization expense $ 14,085us-gaap_FiniteLivedIntangibleAssetsNet $ 16,191us-gaap_FiniteLivedIntangibleAssetsNet