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Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Sep. 13, 2017 | Feb. 25, 2015 | Feb. 10, 2014 | May 22, 2012
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Plan Effective Date | Mar. 19, 2012 |  |  |  |  |  |  |
Unearned premiums | $ 33,000 |  | $ 270,000 | [1] |  |  |  |
Premium deficiency reserves | 500,000 |  | 300,000 |  |  |  |  |
Other liabilities | 13,774,000 |  | 14,063,000 | [1] |  |  |  |
Accrued professional fees | 800,000 |  |  |  |  |  |  |
Comprehensive income | 0 |  |  |  |  |  |  |
Amount of dividends paid on or after Effective Date | 0 |  |  |  |  |  |  |
Preferred stock dividends declared | 13,500,000 |  | 18,000,000 |  |  |  |  |
Preferred stock dividends paid | 13,500,000 | $ 13,500,000 |  |  |  |  |  |
2012 Plan [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  |  |  | 12.0 | 3.0 | 2.0
Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Accrued fees | 12,300,000 |  |  |  |  |  |  |
Accrued dividends | 700,000 |  |  |  |  |  |  |
Preferred stock dividends declared | 13,500,000 |  | 18,000,000 |  |  |  |  |
Additional accrued preferred stock dividends | 700,000 |  | 700,000 |  |  |  |  |
Preferred stock dividends paid | $ 13,500,000 |  | $ 18,000,000 |  |  |  |  |
Preferred stock dividend rate | 3.00% |  | 3.00% |  |  |  |  |
Distribution from WMMRC to WMIH Deposited in Collateral Account [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Approved amount for distribution |  |  |  |  | $ 10,700,000 |  |  |
[1] | Balances derived from audited financial statements as of December 31, 2016.

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