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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Detail) - Successor [Member] - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended 30 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Cash flows from operating activities:                        
Net income (loss)                 $ (328,715) $ 74,317 $ 492,694  
Adjustments to reconcile net income loss to net cash used in operating activities:                        
Accretion (Amortization) of Discounts and Premiums, Investments                 (182,997) (150,061) (129,584)  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net $ (956) $ (13,510) $ (1,763) $ (3,942) $ (2,191) $ (2,853) $ (7,441) $ (9,334) 20,171 21,819 25,659  
Net realized investment gains 68 $ (6,150) $ (4,180) 4,896 (11,536) $ (11,749) $ (14,897) (1,102) (5,366) (39,284) (53,476)  
Decrease in current income taxes payable                 (26,272) 9,727 134  
Share-based compensation                 4,293 5,253 3,104  
Investment income due and accrued                 9,425 (750) (280)  
Other, net                 21,538 (27,896) 80,296  
Net cash provided by (used in) operating activities                 (212,768) 843,540 91,809  
Cash flows from investing activities:                        
Proceeds from matured bonds                 813,990 1,317,215 1,029,026  
Purchases of bonds                 (2,053,693) (2,574,285) (2,374,441)  
Change in short-term investments                 (126,891) (206,002) 134,423  
Proceeds from Sale and Maturity of Other Investments                 349,799 131,703 178,474  
Payments for (Proceeds from) Other Investing Activities                 (10,594) 1,996 (5,143)  
Net cash provided by (used in) investing activities                 928,769 (714,643) (175,745)  
Cash flows from financing activities:                        
Payments for Repurchase of Warrants                 0 2,717 5,375 $ 8,092
Proceeds from Warrant Exercises                 0 2 3  
Net Cash Provided by (Used in) Financing Activities                 (182,117) (69,711) 46,901  
Cash and Cash Equivalents, Period Increase (Decrease)                 532,678 55,281 (38,159)  
Cash and cash equivalents at beginning of period       91,025       35,744 91,025 35,744 73,903  
Cash and cash equivalents end of period 623,703       91,025       623,703 91,025 35,744 623,703
Cash paid during the period for:                        
Income taxes                 40,334 21,437 16,969  
Ambac Financial Group, Inc Parent Company Only [Member]                        
Cash flows from operating activities:                        
Net income (loss)                 (328,715) 74,843 493,403  
Adjustments to reconcile net income loss to net cash used in operating activities:                        
Equity in undistributed net (income) loss of non-debtor subsidiaries                 371,486 (44,393) (421,870)  
Accretion (Amortization) of Discounts and Premiums, Investments                 (16,724) (7,208) (4,690)  
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net                 550 289 155  
Net realized investment gains                 6,575 7 27  
Decrease in current income taxes payable                 (854) 42,126 (71,069)  
Share-based compensation                 4,293 5,253 3,105  
Investment income due and accrued                 (57) (149) (69)  
Decrease in other assets                 (10,814) 646 991  
Other, net                 (9,960) 5,814 549  
Net cash provided by (used in) operating activities                 15,780 77,228 532  
Cash flows from investing activities:                        
Proceeds from matured bonds                 186,747 269,459 347,539  
Purchases of bonds                 (195,853) (279,582) (312,419)  
Change in short-term investments                 (2,961) (18,491) (25,143)  
Net cash provided by (used in) investing activities                 (44,082) (42,287) 4,724  
Cash flows from financing activities:                        
Payments for Repurchase of Warrants                 0 (2,717) (5,375)  
Proceeds from Warrant Exercises                 0 2 3  
Net Cash Provided by (Used in) Financing Activities                 0 (2,715) (5,372)  
Cash and Cash Equivalents, Period Increase (Decrease)                 (28,302) 32,226 (116)  
Cash and cash equivalents at beginning of period       $ 32,251       $ 25 32,251 25 141  
Cash and cash equivalents end of period $ 3,949       $ 32,251       3,949 32,251 25 $ 3,949
Cash paid during the period for:                        
Income taxes                 784 635 394  
Parent [Member]                        
Cash flows from investing activities:                        
Proceeds from Sale and Maturity of Other Investments                 (34,688) (4,664) (5,253)  
Payments for (Proceeds from) Other Investing Activities                 $ 2,673 $ (9,009) $ 0