Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Detail) (Successor Ambac [Member])	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
European ABS Transactions [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Coupon rate	0.59%	0.72%
Maturity	21 years 4 months 1 day	17 years 9 months 40 days
Yield	9.22%	8.02%
US Commercial ABS Transaction [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Coupon rate	5.88%	6.11%
Maturity	15 years 4 months 27 days	6 years 9 months 28 days
Yield	9.50%	11.95%