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Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail)	12 Months Ended
	Dec. 31, 2013 Successor Ambac [Member] Corporate Obligations [Member]	Dec. 31, 2013 Successor Ambac [Member] U.S. Agency Obligations [Member]	Dec. 31, 2013 Successor Ambac [Member] Other Commercial Asset-Backed [Member]	Dec. 31, 2012 Predecessor Ambac [Member] Corporate Obligations [Member]	Dec. 31, 2012 Predecessor Ambac [Member] Collateralized Debt Obligations [Member]	Dec. 31, 2012 Predecessor Ambac [Member] Other Commercial Asset-Backed [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Coupon rate	0.345%	6.98%	0.64%	0.345%	1.05%	0.71%
Maturity	20 years 1 month 21 days	1 year 4 months 13 days	7 years 1 month 24 days	21 years 1 month 21 days	1 year 6 months 4 days	7 years 10 months 10 days
Yield	6.30%	0.39%	2.34%	6.08%	5.92%	7.50%