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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 Ambac [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Investments: |  |
Fixed income securities | $ 6,771,159 | $ 6,282,658
Variable Interest Entities [Member] |  |
Investments: |  |
Fixed income securities | 2,651,683 | 2,475,182
Corporate Debt Securities [Member] |  |
Investments: |  |
Fixed income securities | $ 2,651,683 | $ 2,475,182

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