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Financing Arrangements - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Jan. 05, 2015
Debt Instrument [Line Items] |  |  |  |
Loans outstanding |  | $ 0 wmih_DebtInstrumentOutstanding |  |
Subordinate note issuance terms and conditions |  | Subordinated Notes may be issued by WMIHC, at WMIHC’s option, in one or more tranches over a three year period, subject to certain terms and conditions, including the conditions that (i) all or substantially all of the proceeds from the issuance of the Subordinated Notes are used by WMIHC to fund the acquisition of the assets of, or equity interests of, or a business line, unit or division of, any entity that has been approved by the Board, (ii) no defaults or events of default shall have occurred under the Note Purchase Agreement and (iii) no violation of certain provisions of the Investor Rights Agreement shall have occurred. KKR Management may refuse to purchase Subordinated Notes from WMIHC in the event that a third party (other than KKR or any of its affiliates) (i) has completed a successful proxy contest against WMIHC or (ii) has publicly initiated or threatened to initiate a proxy contest and, in connection therewith, such third party is granted the right to designate more than one nominee to the Board. Upon such refusal, KKR Management will automatically forfeit a percentage of warrants |  |
Maximum percentage of borrowing available on tangible assets | 25.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum |  |  |
Debt instrument maturity description |  | Each Subordinated Note will mature on the date that is seven years from the date that the initial Subordinated Note is first issued (the “Initial Issue Date”). |  |
Debt instrument maturity period | 7 years |  |  |
Due interest on note |  | Interest on the Subordinated Notes is due semi-annually |  |
Subordinated note redemption percentage |  | 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage |  |
Convertible preferred stock, shares issued |  | 1,000,000 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |
Subsequent Event | Series B Preferred Stock [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible preferred stock, shares issued |  |  |  | 600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent Event | Affiliates of KKR [Member] | Series B Preferred Stock [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible preferred stock, shares issued |  |  |  | 200,000 us-gaap_PreferredStockSharesIssued / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = us-gaap_OtherAffiliatesMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal available | 25,000,000 wmih_DebtInstrumentAggregatePrincipalAmount / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Tranche A and Tranche A-1 Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal available |  | 25,000,000 wmih_DebtInstrumentAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = wmih_TrancheAndTrancheOneTermLoanMember | 25,000,000 wmih_DebtInstrumentAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = wmih_TrancheAndTrancheOneTermLoanMember |
Loans outstanding |  | 0 wmih_DebtInstrumentOutstanding / us-gaap_DebtInstrumentAxis = wmih_TrancheAndTrancheOneTermLoanMember | 0 wmih_DebtInstrumentOutstanding / us-gaap_DebtInstrumentAxis = wmih_TrancheAndTrancheOneTermLoanMember |
Tranche B Term Loan [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal available |  | 100,000,000 wmih_DebtInstrumentAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = wmih_TrancheAndSeriesNewTermLoanMember | 100,000,000 wmih_DebtInstrumentAggregatePrincipalAmount / us-gaap_DebtInstrumentAxis = wmih_TrancheAndSeriesNewTermLoanMember |
Loans outstanding |  | 0 wmih_DebtInstrumentOutstanding / us-gaap_DebtInstrumentAxis = wmih_TrancheAndSeriesNewTermLoanMember | 0 wmih_DebtInstrumentOutstanding / us-gaap_DebtInstrumentAxis = wmih_TrancheAndSeriesNewTermLoanMember |
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 |  |  |

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- Definition Identification of the lender and information about a contractual promise to repay a short-term or long-term obligation, which includes borrowings under lines of credit, notes payable, commercial paper, bonds payable, debentures, and other contractual obligations for payment. This may include rationale for entering into the arrangement, significant terms of the arrangement, which may include amount, repayment terms, priority, collateral required, debt covenants, borrowing capacity, call features, participation rights, conversion provisions, sinking-fund requirements, voting rights, basis for conversion if convertible and remarketing provisions. The description may be provided for individual debt instruments, rational groupings of debt instruments, or by debt in total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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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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