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Capital Stock - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Apr. 28, 2015 | Jan. 30, 2015 | Jan. 05, 2015 | Mar. 15, 2015 | Mar. 19, 2012 | Jan. 30, 2014 | Dec. 31, 2013
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 500,000,000 us-gaap_CommonStockSharesAuthorized |  | 500,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  |  |  |
Preferred stock, shares authorized | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  | 5,000,000 us-gaap_PreferredStockSharesAuthorized |  |  |  |  |  |  |
Common stock, par value | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |
Preferred stock, par value | $ 0.00001 us-gaap_PreferredStockParOrStatedValuePerShare |  | $ 0.00001 us-gaap_PreferredStockParOrStatedValuePerShare |  |  |  |  |  |  |
Warrants to purchase in aggregate, shares |  |  |  |  |  |  |  |  | 61,400,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |
Convertible preferred stock conversion price | $ 1.10 wmih_ConvertiblePreferredStockConversionPrice |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference per share | $ 10.00 us-gaap_PreferredStockLiquidationPreference |  |  |  |  |  |  |  |  |
Preferred deemed dividend |  | $ 9,455,000 wmih_PreferredDeemedDividend |  |  |  |  |  |  |  |
Warrants expiration period | 5 years |  |  |  |  |  |  |  |  |
Maximum percent of the voting shares of the emerging entity immediately prior to the confirmation of reorganization | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  |  | 42.50%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |
Registration right period | 180 days |  |  |  |  |  |  |  |  |
Preferred stock dividend rate | 3.00%us-gaap_PreferredStockDividendRatePercentage |  |  |  |  |  |  |  |  |
Escrow deposit |  |  |  |  |  | 598,500,000 us-gaap_EscrowDeposit |  |  |  |
Amount of restricted stock grants | 0 us-gaap_AllocatedShareBasedCompensationExpense |  | 600,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |  |  |
Amount of additional restricted stock grants issued |  |  | 700,000 wmih_AdditionalAllocatedShareBasedCompensationExpense |  |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |  |  |
Unamortized value of unvested restricted share grant | 848,000 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized |  | 1,200,000 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized |  |  |  |  |  |  |
Equity-based compensation | 384,000 us-gaap_ShareBasedCompensation | 129,000 us-gaap_ShareBasedCompensation |  |  |  |  |  |  |  |
Per share of unvested shares of common stock | $ 0.0001 wmih_RepurchasePriceUnvestedCommonStock |  |  |  |  |  |  |  |  |
Vested number of shares | 190,070 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAcceleratedVestingNumber |  |  |  |  |  |  |  |  |
Vested number of shares, outstanding | 113,146 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares |  |  |  |  |  |  |  |  |
Expected increase in additional paid in capital due to early vesting of equity shares | 182,000 wmih_ExpectedAdjustmentsToAdditionalPaidInCapitalEarlyVestingOfEquityCompensation |  |  |  |  |  |  |  |  |
Expected increase in share based compensation due to early vesting of equity shares | 182,000 wmih_ExpectedIncreaseInShareBasedCompensationEarlyVestingOfEquityCompensation |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 202,343,245 us-gaap_CommonStockSharesOutstanding |  | 202,343,245 us-gaap_CommonStockSharesOutstanding |  |  |  |  |  |  |
Warrants to purchase common stock, outstanding | 61,400,000 us-gaap_ClassOfWarrantOrRightOutstanding |  | 61,400,000 us-gaap_ClassOfWarrantOrRightOutstanding |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  | $ 0.00001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Preferred stock, par value |  |  |  | $ 0.00001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Amount of restricted stock grants |  |  |  | 269,234 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Amount of additional restricted stock grants issued |  |  |  | 700,000 wmih_AdditionalAllocatedShareBasedCompensationExpense / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |  |  |
Restricted shares subject to repurchase [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Unvested shares | 562,676 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember |  | 1,343,764 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember |  |  |  |  |  |  | 1,456,987 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | 1,000,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = wmih_SeriesAConvertiblePreferredStockMember |  | 1,000,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = wmih_SeriesAConvertiblePreferredStockMember |  |  |  |  |  | 1,000,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = wmih_SeriesAConvertiblePreferredStockMember |
Purchase price of convertible preferred stock maximum limit |  |  |  |  |  |  |  |  | 11,100,000 us-gaap_PreferredStockValue / us-gaap_StatementClassOfStockAxis = wmih_SeriesAConvertiblePreferredStockMember |
Preferred stock liquidation preference | The Series A Preferred Stock has rights substantially similar to those associated with WMIHC’s common stock, with the exception of a liquidation preference, conversion rights and customary anti-dilution protections. The Series A Preferred Stock has a liquidation preference equal to the greater of (i) $10.00 per one million shares of Series A Preferred Stock plus declared but unpaid dividends on such shares and (ii) the amount that the holder would be entitled to in a relevant transaction had the Series A Preferred Stock been converted to common stock of WMIHC. |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | 1,000,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = wmih_SeriesAConvertiblePreferredStockMember |  | 1,000,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = wmih_SeriesAConvertiblePreferredStockMember |  |  |  |  |  |  |
Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Expiration of right to participating into future offering |  |  |  |  | Jan. 30, 2017 |  |  |  |  |
Preferred stock participation right |  |  |  |  | Additionally, until January 30, 2017, the Series A Holders will have the right to purchase up to 50% of any future equity rights offerings or other equity issuance by WMIHC on the same terms as the equity issued to other investors in such transactions, in an aggregate amount of such offerings and issuances by WMIHC of up to $1.0 billion |  |  |  |  |
Convertible Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum percent of the voting shares of the emerging entity immediately prior to the confirmation of reorganization |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |
Percentage of rights vest with preferred shareholders to future offering |  |  |  |  | 50.00%wmih_PreferredStockParticipationRightsToFutureOfferingPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |
Preferred stock participation value |  |  |  |  | 1,000,000,000 wmih_PreferredStockParticipationRightsValue / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ 1.75 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  | $ 0.00001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred stock, shares issued | 600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 0 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | 600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred stock liquidation preference per share |  |  |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred stock dividend rate |  |  |  |  |  | 3.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Number of trading periods | 20 days |  |  |  |  |  |  |  |  |
Aggregate fair value | 59,000,000 wmih_AggregateFairValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 0 wmih_AggregateFairValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  | 66,200,000 wmih_AggregateFairValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Changes in Fair Value |  |  |  |  |  |  | $ 7,200,000 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |
Preferred stock, shares outstanding | 600,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ 2.25 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |  |  |  |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | 600,000 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = wmih_SeriesBConvertiblePreferredStockMember |  | 0 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = wmih_SeriesBConvertiblePreferredStockMember |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock, Shares |  |  |  |  |  |  |  | 200,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Common stock, shares outstanding | 202,343,245 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 202,343,245 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  | 201,842,351 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Warrant One [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  | 30,700,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_StatementEquityComponentsAxis = wmih_WarrantOneMember |
Warrants to purchase common stock, exercise price |  |  |  |  |  |  |  |  | 1.32 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementEquityComponentsAxis = wmih_WarrantOneMember |
Warrant Two [Member] |  |  |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  | 30,700,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_StatementEquityComponentsAxis = wmih_WarrantTwoMember |
Warrants to purchase common stock, exercise price |  |  |  |  |  |  |  |  | 1.43 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementEquityComponentsAxis = wmih_WarrantTwoMember |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Face amount or stated value per share of common stock. + 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 210.5-02.29) -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 30 -Article 5 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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