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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]        
Direct Premiums Written $ (22,954) $ (24,696) $ (19,304) $ (12,184)
Assumed Reinsurance Premiums Written 0 0 0 0
Ceded Reinsurance Premiums Written (789) (385) (1,832) (1,962)
Premiums written, net of reinsurance 22,165 24,311 17,472 10,222
Direct Premiums Earned 27,559 57,282 87,506 156,582
Assumed Reinsurance Premiums Earned 20 20 59 61
Ceded Reinsurance Premiums Earned 1,939 4,313 5,206 12,889
Reinsurance on premiums earned, Net $ 25,640 $ 52,989 $ 82,359 $ 143,754