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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
Dec. 31, 2014
Dec. 31, 2013
Maturity in:    
Amortized Cost, 2015 $ 18,698wmih_FixedMaturitySecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Amortized Cost, 2016-2019 41,504wmih_FixedMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Total fixed-maturity securities, Amortized Cost 60,202wmih_FixedMaturitySecuritiesAmortizedCost 217,587wmih_FixedMaturitySecuritiesAmortizedCost
Estimated Fair Value, 2015 18,775wmih_FixedMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Estimated Fair Value, 2016-2019 41,866wmih_FixedMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Total fixed-maturity securities, Estimated Fair Value $ 60,641wmih_FixedMaturitySecuritiesEstimatedFairValue $ 218,801wmih_FixedMaturitySecuritiesEstimatedFairValue