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Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Amortization Expense [Line Items] |  |
Total unamortized value | $ 1,439 | $ 700
4th quarter 2014 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 207 |
1st quarter 2015 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 201 |
2nd quarter 2015 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 162 |
3rd quarter 2015 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 162 |
4th quarter 2015 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 162 |
1st quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 154 |
2nd quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 107 |
3rd quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 107 |
4th quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | 107 |
1st quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Total unamortized value | $ 70 |

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- Details
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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
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Namespace Prefix: | wmih_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant