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Capital Stock - Additional Information (Detail) (USD $) | 12 Months Ended | 9 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012 | Jan. 30, 2014 | Jan. 30, 2014 | Jan. 05, 2015 | Mar. 19, 2012
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 |  |  |  |  |  |
Convertible preferred stock, shares issued | 1,000,000 us-gaap_PreferredStockSharesIssued | 0 us-gaap_PreferredStockSharesIssued |  |  |  |  |  |
Purchase price of convertible preferred stock maximum limit |  |  |  |  |  |  |  |
Warrants to purchase in aggregate, shares |  |  |  |  | 61,400,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 61,400,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |
Preferred stock liquidation preference per share | $ 10.00 us-gaap_PreferredStockLiquidationPreference |  |  |  |  |  |  |
Convertible preferred stock conversion price | $ 1.10 wmih_ConvertiblePreferredStockConversionPrice |  |  |  |  |  |  |
Convertible Preferred Stock, shares | 1,000,000 us-gaap_PreferredStockLiquidationPreferenceValue |  |  |  |  |  |  |
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 | 42.50%us-gaap_EquityMethodInvestmentOwnershipPercentage |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Registration right period | 180 days |  |  |  |  |  |  |
Amount of restricted share grants | 1,300,000 us-gaap_AllocatedShareBasedCompensationExpense | 700,000 us-gaap_AllocatedShareBasedCompensationExpense | 600,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |  |  |
Unamortized value of unvested restricted share grant | 1,232,000 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized | 700,000 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized | 400,000 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized | 400,000 wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized |  |  |  |
Equity-based compensation | 807,000 us-gaap_ShareBasedCompensation | 401,000 us-gaap_ShareBasedCompensation | 143,000 us-gaap_ShareBasedCompensation |  |  |  |  |
Per share of unvested shares of common stock | $ 0.0001 wmih_RepurchasePriceUnvestedCommonStock |  |  |  |  |  |  |
Common stock, shares outstanding | 202,343,245 us-gaap_CommonStockSharesOutstanding | 201,842,351 us-gaap_CommonStockSharesOutstanding | 201,156,078 us-gaap_CommonStockSharesOutstanding | 201,156,078 us-gaap_CommonStockSharesOutstanding |  |  |  |
Preferred stock, shares outstanding | 1,000,000 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding | 0 us-gaap_PreferredStockSharesOutstanding |  |  |  |
Warrants to purchase common stock, outstanding | 61,400,000 us-gaap_ClassOfWarrantOrRightOutstanding | 0 us-gaap_ClassOfWarrantOrRightOutstanding | 0 us-gaap_ClassOfWarrantOrRightOutstanding | 0 us-gaap_ClassOfWarrantOrRightOutstanding |  |  |  |
Restricted shares subject to repurchase [Member] |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |
Unvested shares | 1,343,764 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember | 1,456,987 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember | 1,156,078 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember | 1,156,078 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = wmih_UnvestedRestrictedCommonStockSubjectToRepurchaseMember |  |  |  |
Successor [Member] |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  |  |  |  | 0.00001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Preferred deemed dividend | (9,455,000)us-gaap_DividendsPreferredStock / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |  |  |  |
Equity-based compensation | 807,000 us-gaap_ShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 401,000 us-gaap_ShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 143,000 us-gaap_ShareBasedCompensation / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |
Convertible 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 |  |
Purchase price of convertible preferred stock maximum limit |  |  |  |  | 11,100,000 us-gaap_PreferredStockValue / us-gaap_StatementClassOfStockAxis = wmih_SeriesAConvertiblePreferredStockMember | 11,100,000 us-gaap_PreferredStockValue / us-gaap_StatementClassOfStockAxis = wmih_SeriesAConvertiblePreferredStockMember |  |
Preferred stock liquidation preference | The Convertible 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 Convertible Preferred Stock has a liquidation preference equal to the greater of (i) $10.00 per one million shares of Convertible 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 Convertible Preferred Stock been converted to common stock of WMIHC. |  |  |  |  |  |  |
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 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 |  |  |  |  | Additionally, until January 30, 2017, the 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 | 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 | 1,000,000,000 wmih_PreferredStockParticipationRightsValue / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_ConvertiblePreferredStockMember |  |
Series B Preferred Stock [Member] | Subsequent Event |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  |  | $ 0.00001 us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Issuance of common stock, Shares |  |  |  |  |  |  | 600,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Convertible preferred stock, shares issued |  |  |  |  |  |  | 600,000 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Preferred stock liquidation preference per share |  |  |  |  |  |  | $ 1,000 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Convertible preferred stock dividend rate |  |  |  |  |  |  | 3.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
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 [Member] | Successor [Member] |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |
Common stock, shares outstanding | 202,343,245 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 201,842,351 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 201,156,078 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 201,156,078 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |  | 200,000,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Warrant One [Member] |  |  |  |  |  |  |  |
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  | 30,700,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight / us-gaap_StatementEquityComponentsAxis = wmih_WarrantOneMember | 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 | 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 | 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 | 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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