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Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Detail)	12 Months Ended
	Dec. 31, 2013 Successor Ambac [Member] European ABS Transactions [Member]	Dec. 31, 2013 Successor Ambac [Member] US Commercial ABS Transaction [Member]	Dec. 31, 2012 Predecessor Ambac [Member] European ABS Transactions [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Coupon rate	0.72%	6.11%	1.64%
Maturity	17 years 10 months 10 days	6 years 9 months 29 days	12 years 4 months 2 days
Yield	1.10%	11.95%	4.02%