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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 | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | $ 119,635 wmih_FixedMaturitySecuritiesAmortizedCost | $ 60,202 wmih_FixedMaturitySecuritiesAmortizedCost
Total fixed-maturity securities, Gross Unrealized Gains | 395 wmih_FixedMaturitySecuritiesGrossUnrealizedGains | 590 wmih_FixedMaturitySecuritiesGrossUnrealizedGains
Total fixed-maturity securities, Gross Unrealized Losses | (31)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses | (151)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses
Total fixed-maturity securities, Estimated Fair Value | 119,999 wmih_FixedMaturitySecuritiesEstimatedFairValue | 60,641 wmih_FixedMaturitySecuritiesEstimatedFairValue
Less total unrestricted fixed-maturity securities, Amortized Cost | 74,041 wmih_UnrestrictedFixedMaturitySecuritiesAmortizedCost | 7,895 wmih_UnrestrictedFixedMaturitySecuritiesAmortizedCost
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains | 147 wmih_UnrestrictedFixedMaturitySecuritiesGrossUnrealizedGains | 179 wmih_UnrestrictedFixedMaturitySecuritiesGrossUnrealizedGains
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses | (5)wmih_UnrestrictedFixedMaturitySecuritiesGrossUnrealizedLosses | (11)wmih_UnrestrictedFixedMaturitySecuritiesGrossUnrealizedLosses
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 74,183 wmih_UnrestrictedFixedMaturitySecuritiesEstimatedFairValue | 8,063 wmih_UnrestrictedFixedMaturitySecuritiesEstimatedFairValue
Total fixed-maturity securities held in trust, Amortized Cost | 45,594 wmih_FixedMaturitySecuritiesHeldInTrustAmortizedCost | 52,307 wmih_FixedMaturitySecuritiesHeldInTrustAmortizedCost
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 248 wmih_FixedMaturitySecuritiesHeldInTrustGrossUnrealizedGains | 411 wmih_FixedMaturitySecuritiesHeldInTrustGrossUnrealizedGains
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (26)wmih_FixedMaturitySecuritiesHeldInTrustGrossUnrealizedLosses | (140)wmih_FixedMaturitySecuritiesHeldInTrustGrossUnrealizedLosses
Total fixed-maturity securities held in trust, Estimated Fair Value | 45,816 wmih_FixedMaturitySecuritiesHeldInTrustEstimatedFairValue | 52,578 wmih_FixedMaturitySecuritiesHeldInTrustEstimatedFairValue
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 75,474 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 6,491 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Gains | 6 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 12 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Losses | (16)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | (28)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Total fixed-maturity securities, Estimated Fair Value | 75,464 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember | 6,475 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 | 28,264 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 41,018 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Gains | 331 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 531 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Losses | (8)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | (65)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember
Total fixed-maturity securities, Estimated Fair Value | 28,587 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember | 41,484 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 | 10,899 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 12,693 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Gains | 57 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 47 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Total fixed-maturity securities, Gross Unrealized Losses | (7)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | (58)wmih_FixedMaturitySecuritiesGrossUnrealizedLosses / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember
Total fixed-maturity securities, Estimated Fair Value | 10,949 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_ForeignCorporateDebtSecuritiesMember | 12,682 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 | 4,998 wmih_FixedMaturitySecuritiesAmortizedCost / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember |
Total fixed-maturity securities, Gross Unrealized Gains | 1 wmih_FixedMaturitySecuritiesGrossUnrealizedGains / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember |
Total fixed-maturity securities, Estimated Fair Value | $ 4,999 wmih_FixedMaturitySecuritiesEstimatedFairValue / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CommercialPaperMember |

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