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Investments - Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments (Detail) - Successor [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Investment [Line Items]    
Gross realized gains on securities $ 11,054 $ 2,659
Gross realized losses on securities (1,388) (9,471)
Foreign exchange (losses) gains 5,018 6,465
Net realized (losses) gains 4,862 (4,896)
Net other-than-temporary impairments (299) (3,942)
Gain (Loss) on Investments [Member]    
Investment [Line Items]    
Foreign exchange (losses) gains $ (4,804) $ 1,916