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Financial Guarantee Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Policies
Dec. 31, 2017
USD ($)
Policies
Dec. 31, 2016
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 231 277  
Remaining weighted-average contract period (in years) 16 years 17 years  
Gross insured contractual payments outstanding:      
Principal $ 9,403,405 $ 11,687,070  
Interest 10,582,773 11,197,612  
Total 19,986,178 22,884,682  
Gross undiscounted claim liability 3,448,228 8,025,561  
Discount, gross claim liability 1,091,958 1,291,005  
Gross claim liability before all subrogation and before reinsurance 2,356,270 6,734,556  
Less:      
Gross RMBS subrogation (1,809,937) (1,857,502)  
Discount, RMBS subrogation 39,391 23,115  
Discounted RMBS subrogation, before reinsurance (1,770,546) (1,834,387)  
Less:      
Gross other subrogation (784,891) (827,078)  
Discount, other subrogation 133,188 86,822  
Discounted other subrogation, before reinsurance (651,703) (740,256)  
Gross claim liability, net of all subrogation and discounts, before reinsurance (65,979) 4,159,913  
Less: Unearned premium reserves (106,662) (135,502)  
Plus: Loss adjustment expenses reserves 65,759 89,391  
Claim liability reported on Balance Sheet, before reinsurance (106,882) 4,113,802  
Reinsurance recoverable reported on Balance Sheet 23,133 40,997  
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 510 $ 339 $ (349)
Surveillance Category One [Member]      
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 21 26  
Remaining weighted-average contract period (in years) 9 years 10 years  
Gross insured contractual payments outstanding:      
Principal $ 916,530 $ 1,046,267  
Interest 487,702 531,657  
Total 1,404,232 1,577,924  
Gross undiscounted claim liability 4,019 4,434  
Discount, gross claim liability 481 465  
Gross claim liability before all subrogation and before reinsurance 3,538 3,969  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Discounted RMBS subrogation, before reinsurance 0 0  
Less:      
Gross other subrogation 0 0  
Discount, other subrogation 0 0  
Discounted other subrogation, before reinsurance 0 0  
Gross claim liability, net of all subrogation and discounts, before reinsurance 3,538 3,969  
Less: Unearned premium reserves (943) (2,126)  
Plus: Loss adjustment expenses reserves 1,369 16,116  
Claim liability reported on Balance Sheet, before reinsurance 3,964 17,959  
Reinsurance recoverable reported on Balance Sheet $ 367 $ 202  
IA [Member]      
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 28 20  
Remaining weighted-average contract period (in years) 19 years 23 years  
Gross insured contractual payments outstanding:      
Principal $ 708,249 $ 531,190  
Interest 631,708 584,098  
Total 1,339,957 1,115,288  
Gross undiscounted claim liability 63,712 56,659  
Discount, gross claim liability 13,008 13,095  
Gross claim liability before all subrogation and before reinsurance 50,704 43,564  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Discounted RMBS subrogation, before reinsurance 0 0  
Less:      
Gross other subrogation (10,816) (7,990)  
Discount, other subrogation 7,318 5,169  
Discounted other subrogation, before reinsurance (3,498) (2,821)  
Gross claim liability, net of all subrogation and discounts, before reinsurance 47,206 40,743  
Less: Unearned premium reserves (10,073) (9,990)  
Plus: Loss adjustment expenses reserves 4,253 3,242  
Claim liability reported on Balance Sheet, before reinsurance 41,386 33,995  
Reinsurance recoverable reported on Balance Sheet $ 7,285 $ 4,894  
II [Member]      
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 18 26  
Remaining weighted-average contract period (in years) 9 years 10 years  
Gross insured contractual payments outstanding:      
Principal $ 622,820 $ 1,199,909  
Interest 293,293 413,045  
Total 916,113 1,612,954  
Gross undiscounted claim liability 36,000 77,289  
Discount, gross claim liability 3,069 12,250  
Gross claim liability before all subrogation and before reinsurance 32,931 65,039  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Discounted RMBS subrogation, before reinsurance 0 0  
Less:      
Gross other subrogation 0 (9,371)  
Discount, other subrogation 0 2,550  
Discounted other subrogation, before reinsurance 0 (6,821)  
Gross claim liability, net of all subrogation and discounts, before reinsurance 32,931 58,218  
Less: Unearned premium reserves (5,085) (12,238)  
Plus: Loss adjustment expenses reserves 2,564 665  
Claim liability reported on Balance Sheet, before reinsurance 30,410 46,645  
Reinsurance recoverable reported on Balance Sheet $ 4,223 $ 9,424  
III [Member]      
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 16 22  
Remaining weighted-average contract period (in years) 22 years 24 years  
Gross insured contractual payments outstanding:      
Principal $ 1,705,464 $ 1,998,861  
Interest 6,979,130 7,182,715  
Total 8,684,594 9,181,576  
Gross undiscounted claim liability 992,019 1,412,976  
Discount, gross claim liability 433,709 643,897  
Gross claim liability before all subrogation and before reinsurance 558,310 769,079  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Discounted RMBS subrogation, before reinsurance 0 0  
Less:      
Gross other subrogation (136,541) (53,070)  
Discount, other subrogation 67,008 8,349  
Discounted other subrogation, before reinsurance (69,533) (44,721)  
Gross claim liability, net of all subrogation and discounts, before reinsurance 488,777 724,358  
Less: Unearned premium reserves (36,365) (46,086)  
Plus: Loss adjustment expenses reserves (5,926) 13,331  
Claim liability reported on Balance Sheet, before reinsurance 446,486 691,603  
Reinsurance recoverable reported on Balance Sheet $ 26,096 $ 38,465  
IV [Member]      
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 145 179  
Remaining weighted-average contract period (in years) 14 years 13 years  
Gross insured contractual payments outstanding:      
Principal $ 5,407,202 $ 6,862,281  
Interest 2,177,539 2,469,765  
Total 7,584,741 9,332,046  
Gross undiscounted claim liability 2,295,968 6,409,340  
Discount, gross claim liability 637,548 616,559  
Gross claim liability before all subrogation and before reinsurance 1,658,420 5,792,781  
Less:      
Gross RMBS subrogation (1,809,937) (1,857,502)  
Discount, RMBS subrogation 39,391 23,115  
Discounted RMBS subrogation, before reinsurance (1,770,546) (1,834,387)  
Less:      
Gross other subrogation (624,654) (743,456)  
Discount, other subrogation 55,088 67,045  
Discounted other subrogation, before reinsurance (569,566) (676,411)  
Gross claim liability, net of all subrogation and discounts, before reinsurance (681,692) 3,281,983  
Less: Unearned premium reserves (53,987) (64,786)  
Plus: Loss adjustment expenses reserves 63,499 56,037  
Claim liability reported on Balance Sheet, before reinsurance (672,180) 3,273,234  
Reinsurance recoverable reported on Balance Sheet $ (14,838) $ (11,988)  
V [Member]      
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]      
Number of policies | Policies 3 4  
Remaining weighted-average contract period (in years) 3 years 4 years  
Gross insured contractual payments outstanding:      
Principal $ 43,140 $ 48,562  
Interest 13,401 16,332  
Total 56,541 64,894  
Gross undiscounted claim liability 56,510 64,863  
Discount, gross claim liability 4,143 4,739  
Gross claim liability before all subrogation and before reinsurance 52,367 60,124  
Less:      
Gross RMBS subrogation 0 0  
Discount, RMBS subrogation 0 0  
Discounted RMBS subrogation, before reinsurance 0 0  
Less:      
Gross other subrogation (12,880) (13,191)  
Discount, other subrogation 3,774 3,709  
Discounted other subrogation, before reinsurance (9,106) (9,482)  
Gross claim liability, net of all subrogation and discounts, before reinsurance 43,261 50,642  
Less: Unearned premium reserves (209) (276)  
Plus: Loss adjustment expenses reserves 0 0  
Claim liability reported on Balance Sheet, before reinsurance 43,052 50,366  
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0