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Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Amortization Expense [Line Items] |  |  |
Total Unamortized value | $ 706 | $ 407 | $ 0
1st quarter 2014 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | 100 |  |
2nd quarter 2014 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | 100 |  |
3rd quarter 2014 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | 100 |  |
4th quarter 2014 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | 100 |  |
1st quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | 96 |  |
2nd quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | 54 |  |
3rd quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | 54 |  |
4th quarter 2015 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | 54 |  |
1st quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Total Unamortized value | $ 48 |  |

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Share Based Compensation Unvested Restricted Awards Outstanding Unamortized + References No definition available. + Details
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Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant