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Estimated Annual Amortization Expense (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Expected Amortization Expense [Line Items]  
2015 $ 2,974us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 2,640us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 2,631us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 2,534us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 $ 1,722us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive