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Fresh Start Accounting - Assets and Liabilities at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 19, 2012
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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
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, 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
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)
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

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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
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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