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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
Sep. 30, 2015
Dec. 31, 2014
Investments:    
Fixed income securities $ 5,386,628 $ 5,150,018
Variable Interest Entities [Member]    
Investments:    
Fixed income securities 2,679,895 2,743,050
Corporate Obligations [Member]    
Investments:    
Fixed income securities $ 2,679,895 $ 2,743,050