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Goodwill and Other Intangible Assets - Estimated Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Estimated Amortization Expense  
2015 $ 3,500us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 3,500us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 3,100us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 2,500us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 $ 2,400us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive