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Financing Arrangements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2012 | Mar. 19, 2012
--- | --- | ---
Treanche A and Tranch A-1 term loan [Member] |  |
Long Term Debt And Other Financing Arrangement [Line Items] |  |
Principal available | $ 25 | $ 25
Loans outstanding | 0 | 0
Tranche B Term Loan [Member] |  |
Long Term Debt And Other Financing Arrangement [Line Items] |  |
Principal available | 100 | 100
Loans outstanding | $ 0 | $ 0

X
- Definition Debt instrument aggregate principal amount. + References No definition available. + Details
Name: | wmih_DebtInstrumentAggregatePrincipalAmount
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt instrument outstanding. + References No definition available. + Details
Name: | wmih_DebtInstrumentOutstanding
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | wmih_LongTermDebtAndOtherFinancingArrangementLineItems
Namespace Prefix: | wmih_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration