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Financial Guarantee Insurance Contracts - Effect of Reinsurance on Premiums Written and Earned (Detail) - Successor [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]    
Direct Premiums Written $ 5,584 $ (24,780)
Assumed Reinsurance Premiums Written 0 0
Ceded Reinsurance Premiums Written (1,815) (6,045)
Premiums written, net of reinsurance (7,399) 18,735
Direct Premiums Earned 52,065 56,990
Assumed Reinsurance Premiums Earned 21 21
Ceded Reinsurance Premiums Earned 4,473 4,211
Reinsurance on premiums earned, Net $ 47,613 $ 52,800