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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
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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

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