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Restriction on Distribution of Net Assets from Subsidiary - Additional Information (Detail) - USD ($) | Sep. 30, 2017 | Sep. 13, 2017 | Dec. 31, 2016
--- | --- | --- | ---
WMMRC [Member] |  |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |  |
Total net assets | $ 17,700,000 |  | $ 33,800,000
Maximum [Member] | Distribution from WMMRC to WMIH Deposited in Collateral Account [Member] |  |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |  |
Approved amount for distribution |  | $ 10,700,000 |

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