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Capital Stock - Additional Information (Detail) (USD $) | 0 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  | 9 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended |
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Jan. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Mar. 19, 2012 | Sep. 30, 2014 Restricted shares subject to repurchase [Member] | Dec. 31, 2013 Restricted shares subject to repurchase [Member] | Dec. 31, 2012 Restricted shares subject to repurchase [Member] | Sep. 30, 2014 Warrant One [Member] | Sep. 30, 2014 Warrant Two [Member] | Sep. 30, 2014 Series A Convertible Preferred Stock [Member] | Jan. 30, 2014 Convertible Preferred Stock [Member] | Jan. 30, 2014 Convertible Preferred Stock [Member] | Jan. 30, 2014 Convertible Preferred Stock [Member] Maximum [Member] | Mar. 19, 2012 Reorganization Adjustments [Member]
Capital Stock Distribution [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 500,000,000 |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 5,000,000 |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value |  | $ 0.00001 |  | $ 0.00001 |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  | $ 0.00001 |  | $ 0.00001 |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  | 202,343,245 |  | 201,842,351 |  |  |  |  |  |  |  |  |  |  | 200,000,000
Convertible preferred stock, shares issued |  | 1,000,000 |  | 0 |  |  |  |  |  |  | 1,000,000 |  |  |  |
Purchase price of convertible preferred stock maximum limit |  |  |  |  |  |  |  |  |  |  | $ 11,100,000 |  |  |  |
Warrants to purchase in aggregate, shares |  | 61,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  |  |  |  |  |  |  |  | 30,700,000 | 30,700,000 |  |  |  |  |
Warrants to purchase common stock, exercise price |  |  |  |  |  |  |  |  | $ 1.32 | $ 1.43 |  |  |  |  |
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 conversion price |  | $ 1.10 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock liquidation preference per share |  | $ 10.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, shares |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred deemed dividend |  | (9,455,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiration period |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percent of the voting shares of the emerging entity immediately prior to the confirmation of reorganization | 42.50% | 50.00% |  |  | 50.00% |  |  |  |  |  |  |  |  | 50.00% |
Percentage of rights vest with preferred shareholders to future offering |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Expiration of right to participating into future offering |  |  |  |  |  |  |  |  |  |  |  | Jan. 30, 2017 |  |  |
Preferred stock participation value |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 |
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 |  |
Registration right period | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of restricted share grants |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of additional restricted share grants issued |  | 700,000 |  | 700,000 |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized value of unvested restricted share grant |  | 1,439,000 |  | 700,000 |  |  |  |  |  |  |  |  |  |  |
Equity-based compensation |  | $ 600,000 | $ 301,000 | $ 401,000 |  |  |  |  |  |  |  |  |  |  |
Unvested shares |  |  |  |  |  | 1,343,764 | 1,456,987 | 1,156,078 |  |  |  |  |  |  |
Per share of unvested shares of common stock |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  | 202,343,245 |  | 201,842,351 |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding |  | 1,000,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock, outstanding |  | 61,400,000 |  | 0 |  |  |  |  |  |  |  |  |  |  |

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- Definition Preferred stock participation rights expiration date. + References No definition available. + Details
Name: | wmih_PreferredStockParticipationRightsExpirationDate
Namespace Prefix: | wmih_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred stock participation rights to future offering percentage. + References No definition available. + Details
Name: | wmih_PreferredStockParticipationRightsToFutureOfferingPercentage
Namespace Prefix: | wmih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred stock participation rights value. + References No definition available. + Details
Name: | wmih_PreferredStockParticipationRightsValue
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Registration rights agreement blackout and lockups period. + References No definition available. + Details
Name: | wmih_RegistrationRightsAgreementBlackoutAndLockupsPeriod
Namespace Prefix: | wmih_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation unvested restricted awards outstanding unamortized. + References No definition available. + Details
Name: | wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant