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Subsequent Events - Additional Information (Detail) $ in Millions | Jul. 14, 2017 USD ($)
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Subsequent Event [Member] | Distribution from WMMRC to WMIH Deposited in Collateral Account [Member] |
Subsequent Event [Line Items] |
Approved amount for distribution | $ 14.3

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Approved amount for distribution. + References No definition available. + Details
Name: | wmih_ApprovedAmountForDistribution
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=wmih_DistributionFromWMMortgageReinsuranceCompanyToWMIHCorpDepositedInCollateralAccountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |