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Fresh Start Accounting - Adjustment Reflects Reduction of Equity Value Resulting from Fresh Start Accounting (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 19, 2012
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Fresh-Start Adjustment [Line Items] |  |  |
Fair market value reduction |  |  | $ 8,400 wmih_FairMarketValueReduction
Elimination of Court assigned value related to NOLs |  |  | 70,000 wmih_EliminationOfCourtAssignedValue
Total change in fair market value affecting Equity Value |  |  | 78,400 wmih_ChangeInFairMarketValueImpactingEquityValue
Court assigned Equity Value recorded as additional paid-in capital |  |  | 154,998 wmih_CourtAssignedEquityValueRecordedAsAdditionalPaidInCapital
Additional paid-in capital at March 19, 2012 | 106,628 us-gaap_AdditionalPaidInCapital | 77,142 us-gaap_AdditionalPaidInCapital | 76,598 us-gaap_AdditionalPaidInCapital
WMMRC [Member] |  |  |
Fresh-Start Adjustment [Line Items] |  |  |
Fair market value of WMMRC (Court assigned) |  |  | 140,000 wmih_SubsidiaryFairMarketValueCourtAssigned / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember
Fair market value of WMMRC |  |  | 131,600 wmih_SubsidiaryFairMarketValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember
Fair market value reduction |  |  | $ 8,400 wmih_FairMarketValueReduction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase (decrease) in fair market value impacting equity value. + 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 Court assigned equity value recorded as additional paid in capital. + 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 Elimination of court assigned value. + References No definition available. + Details
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Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair market value reduction. + References No definition available. + Details
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Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Subsidiary fair market value. + References No definition available. + Details
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Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Subsidiary fair market value court assigned. + References No definition available. + Details
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Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |