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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 18 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2016
Aug. 03, 2018
Condensed Cash Flow Statements, Captions [Line Items]                          
AMPS Exchange Dollar Value Warrants Issued                         $ 8,012
Cash flows from operating activities:                          
Net income (loss) $ (20,459) $ (22,159) $ 4,313 $ 305,704 $ (19,479) $ (190,905) $ 7,110 $ (125,441) $ 267,399 $ (328,715) $ 74,317    
Adjustments to reconcile net income loss to net cash used in operating activities:                          
Accretion (Amortization) of Discounts and Premiums, Investments                 (136,772) (182,997) (150,061)    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net (1,659) (266) (1,014) (299) (956) (13,510) (1,763) (3,942) 3,238 20,171 21,819    
Net realized investment gains (29,413) $ (30,201) $ (47,148) (4,862) 68 $ (6,150) $ (4,180) 4,896 (111,624) (5,366) (39,284)    
Decrease in current income taxes payable                 (35,498) (26,272) 9,727    
Share-based compensation                 11,854 4,293 5,253    
Investment income due and accrued                 4,967 9,425 (750)    
Other, net                 62,013 13,036 (41,130)    
Net cash used in operating activities                 (1,543,263) (221,270) 830,306    
Cash flows from investing activities:                          
Proceeds from matured bonds                 431,736 813,990 1,317,215    
Purchases of bonds                 (528,156) (2,053,693) (2,574,285)    
Change in short-term investments                 126,742 (126,891) (206,002)    
Proceeds from Sale and Maturity of Other Investments                 158,846 349,799 131,703    
Payments for (Proceeds from) Other Investing Activities                 383 (16,792) 3,042    
Net cash provided by (used in) investing activities                 1,587,856 1,163,439 (453,087)    
Cash flows from financing activities:                          
Payments for Repurchase of Warrants                     2,717 $ 8,092  
AMPS Exchange Cash Paid                 (11,048)        
Proceeds from Warrant Exercises                 3 0 2    
Net Cash Provided by (Used in) Financing Activities                 (585,378) (412,180) (318,982)    
Cash and Cash Equivalents, Period Increase (Decrease)                 (541,188) 528,783 54,332    
Cash and cash equivalents at beginning of period       623,703       91,025 623,703 91,025      
Cash and cash equivalents end of period 63,089       623,703       63,089 623,703 91,025 91,025  
Cash paid during the period for:                          
Income taxes                 34,980 40,334 21,437    
Ambac Financial Group, Inc Parent Company Only [Member]                          
Cash flows from operating activities:                          
Net income (loss)                 185,713 (328,715) 74,843    
Adjustments to reconcile net income loss to net cash used in operating activities:                          
Equity in undistributed net (income) loss of non-debtor subsidiaries                 (157,217) 371,486 (44,393)    
Accretion (Amortization) of Discounts and Premiums, Investments                 (7,284) (16,724) (7,208)    
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net                 918 550 289    
Net realized investment gains                 933 6,575 7    
Decrease in current income taxes payable                 (14,776) (854) 42,126    
Share-based compensation                 11,854 4,293 5,253    
Investment income due and accrued                 (491) (57) (149)    
Decrease in other assets                 11,741 (10,814) 646    
Other, net                 247 (9,960) 5,814    
Net cash used in operating activities                 31,638 15,780 77,228    
Cash flows from investing activities:                          
Proceeds from matured bonds                 230,448 186,747 269,459    
Purchases of bonds                 (136,534) (195,853) (279,582)    
Change in short-term investments                 (123,465) (2,961) (18,491)    
Net cash provided by (used in) investing activities                 (20,648) (44,082) (42,287)    
Cash flows from financing activities:                          
Payments for Repurchase of Warrants                 0 0 (2,717)    
AMPS Exchange Cash Paid                 (11,048)        
Proceeds from Warrant Exercises                 3 0 2    
Net Cash Provided by (Used in) Financing Activities                 3 0 (2,715)    
Cash and Cash Equivalents, Period Increase (Decrease)                 10,993 (28,302) 32,226    
Cash and cash equivalents at beginning of period       $ 3,949       $ 32,251 3,949 32,251 25    
Cash and cash equivalents end of period $ 14,942       $ 3,949       14,942 3,949 32,251 $ 32,251  
Cash paid during the period for:                          
Income taxes                 3,674 784 635    
Parent [Member]                          
Cash flows from investing activities:                          
Proceeds from Sale and Maturity of Other Investments                 24,523 (34,688) (4,664)    
Payments for (Proceeds from) Other Investing Activities                 $ (4,572) $ 2,673 $ (9,009)