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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 | Mar. 31, 2016 | Dec. 31, 2015
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Investments: |  |
Fixed income securities | $ 6,151,939 | $ 5,334,120
Variable Interest Entities [Member] |  |
Investments: |  |
Fixed income securities | 2,622,724 | 2,588,556
Corporate Obligations [Member] |  |
Investments: |  |
Fixed income securities | $ 2,622,724 | $ 2,588,556

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