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Investments - Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Investment [Line Items]        
Foreign exchange (losses) gains     $ (26,741) $ (6,734)
Successor [Member]        
Investment [Line Items]        
Gross realized gains on securities $ 3,912 $ 343 10,391 54,484
Gross realized losses on securities (561) (2,463) (4,673) (7,431)
Foreign exchange (losses) gains 8,398 4,226 22,030 3,801
Net realized (losses) gains 11,749 2,106 27,748 50,854
Net other-than-temporary impairments $ (2,853) $ (9,150) $ (19,628) $ (13,289)