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Subsequent Events - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended
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Jul. 17, 2012
PMI [Member] |
Subsequent Event [Line Items] |
Amount paid by PMI | $ 49.0
WMMRC [Member] |
Subsequent Event [Line Items] |
Amount paid by PMI | $ 30.7

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

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- Definition Amount Paid To Third Party Under Commutation Agreement + References No definition available. + Details
Name: | wmih_AmountPaidToThirdPartyUnderCommutationAgreement
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration