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Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Estimated Fair Values of Fixed-Maturity Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | $ 60,202 wmih_FixedMaturitySecuritiesAmortizedCost | $ 217,587 wmih_FixedMaturitySecuritiesAmortizedCost
Total fixed-maturity securities, Gross Unrealized Gains | 590 wmih_FixedMaturitySecuritiesGrossUnrealizedGains | 1,730 wmih_FixedMaturitySecuritiesGrossUnrealizedGains
Total fixed-maturity securities, Gross Unrealized Losses | (151)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses | (516)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses
Total fixed-maturity securities, Estimated Fair Value | 60,641 wmih_FixedMaturitySecuritiesEstimatedFairValue | 218,801 wmih_FixedMaturitySecuritiesEstimatedFairValue
Total fixed-maturity securities held in trust, Amortized Cost | 52,307 wmih_FixedMaturitySecuritiesHeldInTrustAmortizedCost | 144,909 wmih_FixedMaturitySecuritiesHeldInTrustAmortizedCost
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 411 wmih_FixedMaturitySecuritiesHeldInTrustGrossUnrealizedGains | 1,498 wmih_FixedMaturitySecuritiesHeldInTrustGrossUnrealizedGains
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (140)wmih_FixedMaturitySecuritiesHeldInTrustGrossUnrealizedLosses | (503)wmih_FixedMaturitySecuritiesHeldInTrustGrossUnrealizedLosses
Total fixed-maturity securities held in trust, Estimated Fair Value | 52,578 wmih_FixedMaturitySecuritiesHeldInTrustEstimatedFairValue | 145,904 wmih_FixedMaturitySecuritiesHeldInTrustEstimatedFairValue
Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 7,895 wmih_UnrestrictedFixedMaturitySecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = wmih_TradingSecuritiesMember | 7,326 wmih_UnrestrictedFixedMaturitySecuritiesAmortizedCost / us-gaap_FairValueByAssetClassAxis = wmih_TradingSecuritiesMember
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains | 179 wmih_UnrestrictedFixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_FairValueByAssetClassAxis = wmih_TradingSecuritiesMember | 232 wmih_UnrestrictedFixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_FairValueByAssetClassAxis = wmih_TradingSecuritiesMember
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses | (11)wmih_UnrestrictedFixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_FairValueByAssetClassAxis = wmih_TradingSecuritiesMember | (13)wmih_UnrestrictedFixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_FairValueByAssetClassAxis = wmih_TradingSecuritiesMember
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 8,063 wmih_UnrestrictedFixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = wmih_TradingSecuritiesMember | 7,545 wmih_UnrestrictedFixedMaturitySecuritiesEstimatedFairValue / us-gaap_FairValueByAssetClassAxis = wmih_TradingSecuritiesMember
Held to Maturity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost |  | 65,352 wmih_UnrestrictedFixedMaturitySecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember
Less total unrestricted fixed-maturity securities, Estimated Fair Value |  | 65,352 wmih_UnrestrictedFixedMaturitySecuritiesEstimatedFairValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 6,491 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 15,868 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Gains | 12 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 127 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Losses | (28)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | (163)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total fixed-maturity securities, Estimated Fair Value | 6,475 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 15,832 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 41,018 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 80,624 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Gains | 531 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 1,450 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Losses | (65)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | (182)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Total fixed-maturity securities, Estimated Fair Value | 41,484 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 81,892 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 12,693 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 22,166 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Gains | 47 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 149 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Losses | (58)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | (170)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Total fixed-maturity securities, Estimated Fair Value | 12,682 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 22,145 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Commercial Paper [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost |  | 98,929 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember
Total fixed-maturity securities, Gross Unrealized Gains |  | 4 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember
Total fixed-maturity securities, Gross Unrealized Losses |  | (1)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember
Total fixed-maturity securities, Estimated Fair Value |  | $ 98,932 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember

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