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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Investment [Line Items]        
Gross realized gains on securities $ 343 $ 7,658 $ 54,484 $ 37,355
Gross realized losses on securities (2,463) (3,908) (7,431) (7,779)
Foreign exchange (losses) gains 4,226 6,295 3,801 (175)
Net realized (losses) gains 2,106 10,045 50,854 29,401
Net other-than-temporary impairments $ (9,150) $ (5,011) $ (13,289) $ (24,157)