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Related Party Transactions - Additional Information (Detail) - SPC Global RE Advisors LLC [Member] - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |
Consulting agreement terminated date | Sep. 18, 2015 |
Payments due to related party |  | $ 0

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