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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investment [Line Items]        
Gross realized gains on securities $ 30,909 $ 14,430 $ 83,937 $ 25,374
Gross realized losses on securities (2,171) (4,932) 5,200 16,160
Foreign exchange (losses) gains     (5,211) 19,142
Net realized (losses) gains 30,201 6,150 82,211 5,434
Net other-than-temporary impairments (266) (13,510) (1,579) (19,215)
Gain (Loss) on Investments [Member]        
Investment [Line Items]        
Foreign exchange (losses) gains $ 1,463 $ (3,348) $ 3,474 $ (3,780)