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Service Agreements and Related Party Transactions - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 02, 2015 USD ($) | Oct. 14, 2014 Directors | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Jan. 05, 2015 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 |  |  |
Proceeds from litigation settlement amount | $ 9,000 |  |  |  |  |  |
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 | $ 1,500 | $ 1,700 |
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 amount |  |  |  | $ 100 |  |  |
Proceeds from litigation settlement amount |  |  | $ 8,300 |  |  |  |
Litigation settlement reserve for reimbursement of contingent fees and expenses |  |  |  | 500 |  |  |
Net proceeds from litigation settlement |  |  |  | 34,000 |  |  |
Legal fees and expenses associated with the recovery of the litigation proceeds |  |  |  | 600 |  |  |
Other income |  |  |  | 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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