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Special Purpose Entities, Including Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Detail) - Successor [Member] - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Investments:    
Fixed income securities $ 5,887,129 $ 6,049,908
Variable Interest Entities [Member]    
Investments:    
Fixed income securities 2,722,316 2,622,566
Corporate Obligations [Member]    
Investments:    
Fixed income securities $ 2,722,316 $ 2,622,566