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Restriction on Distribution of Net Assets from Subsidiary - Additional Information (Detail) - USD ($) $ in Millions | Jul. 14, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
WMMRC [Member] |  |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |  |
Total net assets |  | $ 32.0 | $ 33.8
Subsequent Event [Member] | Distribution from WMMRC to WMIH Deposited in Collateral Account [Member] |  |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |  |
Approved amount for distribution | $ 14.3 |  |

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