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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Fixed-Maturity Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Maturity in:    
Amortized Cost, 2015 $ 85,087wmih_FixedMaturitySecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Amortized Cost, 2016-2019 34,548wmih_FixedMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Total fixed-maturity securities, Amortized Cost 119,635wmih_FixedMaturitySecuritiesAmortizedCost 60,202wmih_FixedMaturitySecuritiesAmortizedCost
Estimated Fair Value, 2015 85,122wmih_FixedMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Estimated Fair Value, 2016-2019 34,877wmih_FixedMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Total fixed-maturity securities, Estimated Fair Value $ 119,999wmih_FixedMaturitySecuritiesEstimatedFairValue $ 60,641wmih_FixedMaturitySecuritiesEstimatedFairValue