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Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Amortization Expense [Line Items] |  |
Total Unamortized value | $ 806 | $ 407
4th Quarter 2013 [Member] |  |
Amortization Expense [Line Items] |  |
Total Unamortized value | 100 |
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
Name: | wmih_AmortizationExpenseLineItems
Namespace Prefix: | wmih_
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
Name: | wmih_ShareBasedCompensationUnvestedRestrictedAwardsOutstandingUnamortized
Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant