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Financing Arrangements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Mar. 19, 2012
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Tranche A and Tranche A-1 term loan [Member] |  |
Long Term Debt And Other Financing Arrangement [Line Items] |  |
Principal available | $ 25.0 | $ 25.0
Loans outstanding | 0 | 0
Tranche B term loan [Member] |  |
Long Term Debt And Other Financing Arrangement [Line Items] |  |
Principal available | 100.0 | 100.0
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

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