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Service Agreements and Related Party Transactions - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 14, 2014 Directors | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Related Party Transaction [Line Items] |  |  |  |
Payment of stock offering fee |  |  | $ 19,310 | $ 3,348
WMMRC [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Administrative services agreement fee |  | $ 110 |  |
Pro Rata Share of the Common Stock Allotment | shares |  | 10,000,000 |  |
Percentage of Pro Rata Share of the Common Stock Election |  | 5.00% |  |
Percentage of interest in litigation proceeds |  | 50.00% |  |
Lawsuit against number of former directors | Directors | 16 |  |  |
Litigation settlement amount |  |  | 37,000 |
Litigation settlement reserve for reimbursement of contingent fees and expenses |  |  | 3,000 |
WMMRC [Member] | Runoff Notes [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Principal amount of Runoff Notes | $ / shares |  | $ 1.00 |  |
WMMRC [Member] | Investment Management Agreement And Administrative Services Agreement [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Expenses incurred under the agreements |  | $ 1,400 | 1,400 | $ 1,500
WMMRC [Member] | Investment Management Agreement [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Description of fee |  | fee equal to the product of (x) the ending dollar amount of assets under management during the calendar month in question and (y) .002 divided by 12. |  |
WMI Holdings Corp [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Litigation settlement reserve for reimbursement of contingent fees and expenses |  | $ 2,000 |  |
Other income |  | $ 123 | 7,800 |
KKR Capital Markets LLC [Member] | Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Payment of stock offering fee |  |  | 8,250 |
Payment of additional deferred Fee |  |  | $ 8,250 |

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