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Financing Arrangements - Additional Information (Detail) (USD $) | Jan. 05, 2015 | Jan. 30, 2014 | Mar. 31, 2015 | Dec. 31, 2014
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Debt Instrument [Line Items] |  |  |  |
Loans outstanding | $ 0 wmih_DebtInstrumentOutstanding |  |  |
7.50% Subordinated Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal available |  | $ 150,000,000 wmih_DebtInstrumentAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = wmih_SevenPointFiveZeroPercentSubordinatedNotesMember |  |
Debt instrument, interest rate, stated percentage |  | 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = wmih_SevenPointFiveZeroPercentSubordinatedNotesMember |  |
Series B Preferred Stock [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Preferred stock, shares issued | 600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 0 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Affiliates of KKR [Member] | Series B Preferred Stock [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Preferred stock, shares issued | 200,000 us-gaap_PreferredStockSharesIssued / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = us-gaap_OtherAffiliatesMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |

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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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