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Service Agreements and Related Party Transactions - Additional Information (Detail) (WMMRC [Member], USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 14, 2014 Directors | Dec. 31, 2014 | Jan. 05, 2015 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2011
Related Party Transaction [Line Items] |  |  |  |  |  |
Pro Rata Share of the Common Stock Allotment |  | 10,000,000 wmih_ProRataShareOfCommonStockElection |  |  |  |
Percentage of Pro Rata Share of the Common Stock Election |  | 5.00%wmih_PercentageOfProRataShareOfCommonStockElection |  |  |  |
Percentage of interest in Litigation Proceeds |  | 50.00%wmih_PercentageOfInterestInLitigationProceeds |  |  |  |
Principal amount of Runoff Notes |  | $ 1.00 wmih_PrincipalAmountOfRunoffNotes |  |  |  |
Lawsuit against number of former directors | 16 us-gaap_LossContingencyNumberOfDefendants |  |  |  |  |
Litigation settlement amount |  | $ 37,000,000 us-gaap_LitigationSettlementAmount |  |  |  |
Subsequent Event |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Proceeds from litigation settlement amount |  |  | 9,000,000 us-gaap_ProceedsFromLegalSettlements / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Investment Management Agreement And Administrative Services Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses incurred under the agreements |  | 1,500,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = wmih_InvestmentManagementAgreementAndAdministrativeServicesAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember |  | 1,500,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = wmih_InvestmentManagementAgreementAndAdministrativeServicesAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember | 1,700,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = wmih_InvestmentManagementAgreementAndAdministrativeServicesAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember | 0 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionAxis = wmih_InvestmentManagementAgreementAndAdministrativeServicesAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember
Investment Management Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Description of fee |  | fee equal to the product of (x) the ending dollar amount of assets under management during the calendar month in question and (y) .002 divided by 12. |  |  |  |
Administrative Services Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Administrative services agreement fee |  | $ 110,000 wmih_RelatedPartyTransactionAdministrativeServicesAgreementFee / us-gaap_RelatedPartyTransactionAxis = wmih_AdministrativeServicesAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = wmih_WmmrcMember |  |  |  |

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of defendants named in a legal action. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfDefendants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_ProceedsFromLegalSettlements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of fee. + References No definition available. + Details
Name: | wmih_DescriptionOfFee
Namespace Prefix: | wmih_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of interest in litigation proceeds. + References No definition available. + Details
Name: | wmih_PercentageOfInterestInLitigationProceeds
Namespace Prefix: | wmih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of pro rata share of common stock election. + References No definition available. + Details
Name: | wmih_PercentageOfProRataShareOfCommonStockElection
Namespace Prefix: | wmih_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Principal amount of runoff notes. + References No definition available. + Details
Name: | wmih_PrincipalAmountOfRunoffNotes
Namespace Prefix: | wmih_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Pro rata share of common stock election. + References No definition available. + Details
Name: | wmih_ProRataShareOfCommonStockElection
Namespace Prefix: | wmih_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Related party transaction administrative services agreement fee. + References No definition available. + Details
Name: | wmih_RelatedPartyTransactionAdministrativeServicesAgreementFee
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant