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Fresh Start Accounting - Assets and Liabilities at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 19, 2012 | Dec. 31, 2013 Reorganization Adjustments [Member]
--- | --- | ---
Investments held in trust, at fair value: |  |
Fixed-maturity securities, Predecessor | $ 303,169 |
Cash equivalents held in trust, Predecessor | 26,249 |
Total investments held in trust, Predecessor | 329,418 |
Cash and cash equivalents, Predecessor | 7,014 |
Fixed-maturity securities, at fair value, Predecessor | 6,049 |
Accrued investment income, Predecessor | 2,313 |
Other assets, Predecessor | 3,389 |
Total assets, Predecessor | 348,183 |
Fixed-maturity securities, Successor | 303,169 |
Cash equivalents held in trust, Successor | 26,249 |
Total investments held in trust, Successor | 329,418 |
Cash and cash equivalents, Successor | 82,014 |
Fixed-maturity securities, at fair value, Successor | 6,049 |
Accrued investment income, Successor | 2,313 |
Other assets, Successor | 3,389 |
Total assets, Successor | 423,183 |
Liabilities: |  |
Losses and loss adjustment reserves, Predecessor | 141,010 |
Losses payable, Predecessor | 7,585 |
Unearned premiums, Predecessor | 409 |
Accrued ceding commissions, Predecessor | 466 |
Other liabilities, Predecessor | 27,156 |
Total liabilities, Predecessor | 176,626 |
Notes payable-principal, Reorganization Adjustments | 130,000 |
Other liabilities, Reorganization Adjustments | (23,109) |
Total liabilities, Reorganization Adjustments | 106,891 |
Loss contract fair market value reserve, Fair Value Adjustments | 63,064 |
Other liabilities, Fair Value Adjustments | 2 |
Total liabilities, Fair Value Adjustments | 63,066 |
Notes payable, Successor | 130,000 |
Losses and loss adjustment reserves, Successor | 141,010 |
Losses payable, Successor | 7,585 |
Unearned premiums, Successor | 409 |
Accrued ceding commissions, Successor | 466 |
Loss contract fair market value reserve, Successor | 63,064 |
Other liabilities, Successor | 4,049 |
Total liabilities, Successor | 346,583 |
Shareholders' equity: |  |
Common stock, Predecessor | 1 |
Additional paid-in capital, Predecessor | 69,879 |
Retained earnings, Predecessor | 101,677 |
Total shareholders' equity, Predecessor | 171,557 |
Total liabilities and shareholders' equity, Predecessor | 348,183 |
Common stock, Reorganization Adjustments | 2 |
Additional paid-in capital, Reorganization Adjustments | 154,998 |
Retained earnings, Reorganization Adjustments | 23,109 |
Total shareholders' equity, Reorganization Adjustments | 178,109 |
Total liabilities and shareholders' equity, Reorganization Adjustments | 285,000 |
Common stock, Fair Value Adjustments | (1) |
Additional paid-in capital (Predecessor), Fair Value Adjustments | (69,879) |
Additional paid-in capital (Successor), Fair Value Adjustments | (78,400) |
Retained earnings, Fair Value Adjustments | (124,786) |
Total shareholders' equity, Fair Value Adjustments | (273,066) |
Total liabilities and shareholders' equity, Fair Value Adjustments | (210,000) |
Postconfirmation, Common Stock | 2 |
Postconfirmation, Additional Paid-in Capital | 76,598 |
Total shareholders' equity, Successor | 76,600 |
Total liabilities and shareholders' equity, Successor | 423,183 |
Cash and cash equivalents, Reorganization Adjustments | 75,000 |
Other assets, Reorganization Adjustments | 210,000 |
Total assets, Reorganization Adjustments | 285,000 |
Other assets, Fair Value Adjustments | (210,000) |
Total assets, Fair Value Adjustments | (210,000) |
Goodwill recorded |  | $ 0

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Name: | wmih_PreconfirmationAccruedCedingCommissions
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation cash and cash equivalents held in trust. + References No definition available. + Details
Name: | wmih_PreconfirmationCashAndCashEquivalentsHeldInTrust
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Preconfirmation fair value adjustment additional paid in capital. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentAdditionalPaidInCapital
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fair value adjustment additional paid in capital predecessor. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentAdditionalPaidInCapitalPredecessor
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fair value adjustment common stock. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentCommonStock
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fair value adjustment liabilities and stockholders equity. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentLiabilitiesAndStockholdersEquity
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fair value adjustment Loss contract fair market value reserve. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentLossContractFairMarketValueReserve
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fair value adjustment other liabilities. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentOtherLiabilities
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fair value adjustment retained earnings deficit. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentRetainedEarningsDeficit
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fair value adjustments assets. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentsAssets
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Preconfirmation fair value adjustments liabilities. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentsLiabilities
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fair value adjustments other assets. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentsOtherAssets
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Preconfirmation fair value adjustment stockholders equity. + References No definition available. + Details
Name: | wmih_PreconfirmationFairValueAdjustmentStockholdersEquity
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation fixed-maturity securities. + References No definition available. + Details
Name: | wmih_PreconfirmationFixedMaturitySecurities
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Preconfirmation fixed maturity securities, at fair value. + References No definition available. + Details
Name: | wmih_PreconfirmationFixedMaturitySecuritiesAtFairValue
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Preconfirmation investments held in trust. + References No definition available. + Details
Name: | wmih_PreconfirmationInvestmentsHeldInTrust
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Preconfirmation investments income. + References No definition available. + Details
Name: | wmih_PreconfirmationInvestmentsIncome
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Preconfirmation losses and loss adjustment reserves. + References No definition available. + Details
Name: | wmih_PreconfirmationLossesAndLossAdjustmentReserves
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation losses payable. + References No definition available. + Details
Name: | wmih_PreconfirmationLossesPayable
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation other liabilities. + References No definition available. + Details
Name: | wmih_PreconfirmationOtherLiabilities
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Preconfirmation unearned premiums. + References No definition available. + Details
Name: | wmih_PreConfirmationUnearnedPremiums
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant