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Fresh Start Financial Statement Reporting - Fresh Start Reorganized Condensed Consolidated Balance Sheet (Parenthetical) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2013 | Apr. 30, 2013
--- | --- | ---
Fresh-Start Adjustment [Line Items] |  |
Common stock, shares issued | 45,000,000 |
Number of warrants issued | 5,047,138 |
Pre-tax gain on extinguishment of obligations |  | $ 1,521,435
Internal Revenue Service [Member] |  |
Fresh-Start Adjustment [Line Items] |  |
Cash payments to IRS under the IRS Settlement | $ 101,900 |
Successor Ambac [Member] |  |
Fresh-Start Adjustment [Line Items] |  |
Common stock, shares issued | 45,002,524 | 45,000,000
Number of warrants issued |  | 5,047,138

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