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Income Taxes - Provision for Income Taxes Charged to Income from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	8 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2013 Successor Ambac [Member]	Apr. 30, 2013 Predecessor Ambac [Member]	Dec. 31, 2012 Predecessor Ambac [Member]
Provision For Income Taxes [Line Items]
Current taxes	$ 6,984	$ 761	$ 1,263
Deferred taxes	530	(6)	1,586
Total effect of income taxes	$ 7,514	$ 755	$ 2,849

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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