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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) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 Successor Ambac [Member] | Sep. 30, 2013 Successor Ambac [Member] Variable Interest Entities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Variable Interest Entities [Member] | Sep. 30, 2013 Corporate Obligations [Member] Successor Ambac [Member] | Dec. 31, 2012 Corporate Obligations [Member] Predecessor Ambac [Member]
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Investments: |  |  |  |  |  |
Fixed income securities | $ 6,448,167 | $ 2,423,914 | $ 6,329,832 | $ 2,261,294 | $ 2,423,914 | $ 2,261,294

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