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Estimated Percentage of VOBA Balance to be Amortized (Detail)
12 Months Ended
Dec. 31, 2014
VOBA Amortization  
2015 14.00%us-gaap_PercentageOfAmountAmortizedOfEndingPresentValueOfFutureInsuranceProfitsYearOne
2016 12.00%us-gaap_PercentageOfAmountAmortizedOfEndingPresentValueOfFutureInsuranceProfitsYearTwo
2017 11.00%us-gaap_PercentageOfAmountAmortizedOfEndingPresentValueOfFutureInsuranceProfitsYearThree
2018 9.00%us-gaap_PercentageOfAmountAmortizedOfEndingPresentValueOfFutureInsuranceProfitsYearFour
2019 and thereafter 54.00%us-gaap_PercentageOfAmountAmortizedOfEndingPresentValueOfFutureInsuranceProfitsYearFive