Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - USD ($) $ in Thousands	3 Months Ended								4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Apr. 30, 2013	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Successor [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Written										$ (80,309)	$ (37,572)	$ (288,310)
Assumed Reinsurance Premiums Written										0	0	0
Ceded Reinsurance Premiums Written										(7,810)	(3,001)	(6,842)
Premiums written, net of reinsurance										72,499	34,571	281,468
Direct Premiums Earned										226,326	336,025	261,634
Assumed Reinsurance Premiums Earned										65	87	137
Ceded Reinsurance Premiums Earned										12,873	23,517	15,411
Reinsurance on premiums earned, Net	$ 114,463	$ 71,535	$ 60,879	$ 65,718	$ 33,969	$ 64,831	$ 65,013	$ 82,547		$ 213,518	$ 312,595	$ 246,360
Predecessor [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Written									$ (14,125)
Assumed Reinsurance Premiums Written									0
Ceded Reinsurance Premiums Written									(1,098)
Premiums written, net of reinsurance									13,027
Direct Premiums Earned									138,468
Assumed Reinsurance Premiums Earned									32
Ceded Reinsurance Premiums Earned									8,500
Reinsurance on premiums earned, Net									$ 130,000