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Service Agreements and Related Party Transactions - Additional Information (Detail) |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 12, 2018 USD ($) | Oct. 14, 2014 Directors | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payment of stock offering fee |  |  | $ 2,500,000 |  |  |  |
WMMRC [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Administrative services agreement fee |  |  | 110,000 |  |  |  |
Lawsuit against number of former directors | Directors |  | 16 |  |  |  |  |
Litigation settlement amount |  |  |  |  |  |  | $ 37,000,000
Litigation settlement reserve for reimbursement of contingent fees and expenses |  |  |  |  |  |  | 3,000,000
WMMRC [Member] | Investment Management Agreement And Administrative Services Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expenses incurred under the agreements |  |  | $ 700,000 | $ 700,000 |  |  |
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 |  |  | $ 1,500,000 |  |  |  |
Other income |  |  |  |  | $ 123,000 | $ 123,000 | 7,800,000
Income from litigation proceeds |  |  | $ 0 |  |  |  |
KKR Capital Markets LLC [Member] | Non-Exclusive Financial Advisor [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Transaction fee receive with respect to merger | $ 25,000,000 |  |  |  |  |  |
KKR Capital Markets LLC [Member] | Placement Agent [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Bridge financing facility, commitment fee percentage | 0.25% |  |  |  |  |  |
Fees payable for arranging bridge facility | $ 6,875,000 |  |  |  |  |  |
KKR Capital Markets LLC [Member] | Maximum [Member] | Placement Agent [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Bridge financing facility | $ 2,750,000,000 |  |  |  |  |  |
KKR Capital Markets LLC [Member] | Redeemable Convertible Series B Preferred Stock [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payment of stock offering fee |  |  |  |  |  |  | 8,250,000
Payment of additional deferred Fee |  |  |  |  |  |  | $ 8,250,000

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