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Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands | Jul. 10, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Restricted cash received from WMMRC |  | $ 582,687 | $ 2,447
Notes payable - principal |  | 29,173 | $ 31,220
WMMRC [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Restricted cash received from WMMRC |  | $ 400 |
Subsequent Event [Member] | Second Lien Runoff Notes [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Repayment of notes payable-principal | $ 365 |  |
Repayment of notes payable-interest | 5 |  |
Notes payable - principal | $ 28,800 |  |

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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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 Notes payable principal amount. + References No definition available. + Details
Name: | wmih_NotesPayablePrincipalAmount
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Repayment of notes payable interest amount. + References No definition available. + Details
Name: | wmih_RepaymentOfNotesPayableInterestAmount
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Repayment of notes payable principal amount. + References No definition available. + Details
Name: | wmih_RepaymentOfNotesPayablePrincipalAmount
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=wmih_WMMortgageReinsuranceCompanyIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=wmih_SecondLienRunoffNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |