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Financial Guarantee Insurance Contracts - Summary of Rollforward of RMBS Subrogation, by Estimation Approach (Parenthetical) (Detail)	8 Months Ended	12 Months Ended	4 Months Ended
	Dec. 31, 2013 Successor Ambac [Member] Transactions	Dec. 31, 2012 Predecessor Ambac [Member] Transactions	Apr. 30, 2013 Predecessor Ambac [Member] Adverse Samples [Member] Transactions
Summary Of Rollforward Of Subrogation By Estimation Approach [Line Items]
Number of transactions added to the Adverse Sample subrogation population			2
Number of transactions removed from Adverse Sample subrogation population	2	2

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- Definition

Number of transaction removed from the Adverse Sample subrogation population.

+ References

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- Definition

Number of transaction added to the Adverse Sample subrogation population.

+ References

No definition available.

+ Details

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