Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - Successor [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Written	$ 6,928	$ (4,041)	$ 12,512	$ (28,821)
Assumed Reinsurance Premiums Written	0	0	0	0
Ceded Reinsurance Premiums Written	238	(854)	(1,577)	(6,899)
Premiums written, net of reinsurance	(6,690)	3,187	(14,089)	21,922
Direct Premiums Earned	47,235	44,974	99,300	101,963
Assumed Reinsurance Premiums Earned	20	21	41	43
Ceded Reinsurance Premiums Earned	4,103	3,593	8,576	7,804
Reinsurance on premiums earned, Net	$ 43,152	$ 41,402	$ 90,765	$ 94,202