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The Company and its Subsidiaries - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2012 Operations
Schedule Of Description Of Company [Line Items] |
Number of operations | 1

X
- Definition Number of operations operated in runoff. + References No definition available. + Details
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Namespace Prefix: | wmih_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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