Financial Guarantee Insurance Contracts - Summarized Future Gross Undiscounted Premiums Expected to be Collected, and Future Expected Premiums Earned, Net of Reinsurance (Detail) - Successor [Member] $ in Thousands	Dec. 31, 2015 USD ($)
Future premiums expected to be collected, March 31, 2015	$ 21,499
Future premiums expected to be collected, June 30. 2015	19,890
Future premiums expected to be collected, September 30, 2015	19,839
Future premiums expected to be collected, December 31, 2015	20,005
Future premiums expected to be collected, December 31, 2016	75,224
Future premiums expected to be collected, December 31, 2017	70,587
Future premiums expected to be collected, December 31, 2018	66,891
Future premiums expected to be collected, December 31, 2019	63,783
Future premiums expected to be collected, December 31, 2024	264,200
Future premiums expected to be collected, December 31, 2029	217,422
Future premiums expected to be collected, December 31, 2034	138,592
Future premiums expected to be collected, December 31, 2039	43,887
Future premiums expected to be collected, December 31, 2044	18,989
Future premiums expected to be collected, December 31, 2049	7,143
Future premiums expected to be collected, December 31, 2054	601
Future premiums expected to be collected, Total	1,048,552
Future expected premium to be earned, net of reinsurance, March 31, 2015	32,590
Future expected premiums to be earned, net of reinsurance, June 30, 2015	30,882
Future expected premiums to be earned, net of reinsurance, September 30, 2015	28,815
Future expected premiums to be earned, net of reinsurance, December 31, 2015	27,487
Future expected premiums to be earned, net of reinsurance, December 31, 2016	99,097
Future expected premiums to be earned, net of reinsurance, December 31, 2017	87,270
Future expected premiums to be earned, net of reinsurance, December 31, 2018	80,947
Future expected premiums to be earned, net of reinsurance, December 31, 2019	76,310
Future expected premiums to be earned, net of reinsurance, December 31, 2024	307,812
Future expected premiums to be earned, net of reinsurance, December 31, 2029	214,920
Future expected premiums to be earned, net of reinsurance, December 31, 2034	126,716
Future expected premiums to be earned, net of reinsurance, December 31, 2039	44,078
Future expected premiums to be earned, net of reinsurance, December 31, 2044	17,498
Future expected premiums to be earned, net of reinsurance, December 31, 2049	7,804
Future expected premiums to be earned, net of reinsurance, December 31, 2054	1,298
Future expected premiums to be earned, net of reinsurance, Total	$ 1,183,524