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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
 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Policies
Dec. 31, 2018
USD ($)
Policies
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Loss Reserves Ceded To Reinsurers $ 25,749 $ 22,623 $ 25,326 $ 40,658
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 287 $ 510 $ 185  
Number of policies | Policies 221 231    
Remaining weighted-average contract period (in years) 15 years 16 years    
Gross insured contractual payments outstanding:        
Principal $ 6,364,748 $ 9,403,405    
Interest 3,132,409 10,582,773    
Total 9,497,157 19,986,178    
Gross undiscounted claim liability 2,352,524 3,448,228    
Discount, gross claim liability 486,333 1,091,958    
Gross claim liability before all subrogation and before reinsurance 1,866,191 2,356,270    
Less:        
Gross RMBS subrogation (1,784,421) (1,809,937)    
Discount, RMBS subrogation 29,477 39,391    
Discounted RMBS subrogation, before reinsurance (1,754,944) (1,770,546)    
Less:        
Gross other subrogation (736,966) (784,891)    
Discount, other subrogation 48,076 133,188    
Discounted other subrogation, before reinsurance (688,890) (651,703)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (577,643) (65,979)    
Less: Unearned premium reserves (55,472) (106,662)    
Plus: Loss adjustment expenses reserves 73,151 65,759    
Claim liability reported on Balance Sheet, before reinsurance (559,964) (106,882)    
Reinsurance recoverable reported on Balance Sheet $ 26,036 $ 23,133    
I/SL [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 34 21    
Remaining weighted-average contract period (in years) 8 years 9 years    
Gross insured contractual payments outstanding:        
Principal $ 748,982 $ 916,530    
Interest 371,462 487,702    
Total 1,120,444 1,404,232    
Gross undiscounted claim liability 2,037 4,019    
Discount, gross claim liability 144 481    
Gross claim liability before all subrogation and before reinsurance 1,893 3,538    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (21) 0    
Discount, other subrogation 2 0    
Discounted other subrogation, before reinsurance (19) 0    
Gross claim liability, net of all subrogation and discounts, before reinsurance 1,874 3,538    
Less: Unearned premium reserves (1,405) (943)    
Plus: Loss adjustment expenses reserves 837 1,369    
Claim liability reported on Balance Sheet, before reinsurance 1,306 3,964    
Reinsurance recoverable reported on Balance Sheet $ 140 $ 367    
IA [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 20 28    
Remaining weighted-average contract period (in years) 18 years 19 years    
Gross insured contractual payments outstanding:        
Principal $ 649,596 $ 708,249    
Interest 582,864 631,708    
Total 1,232,460 1,339,957    
Gross undiscounted claim liability 53,685 63,712    
Discount, gross claim liability 5,129 13,008    
Gross claim liability before all subrogation and before reinsurance 48,556 50,704    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation 0 (10,816)    
Discount, other subrogation 0 7,318    
Discounted other subrogation, before reinsurance 0 (3,498)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 48,556 47,206    
Less: Unearned premium reserves (9,307) (10,073)    
Plus: Loss adjustment expenses reserves 341 4,253    
Claim liability reported on Balance Sheet, before reinsurance 39,590 41,386    
Reinsurance recoverable reported on Balance Sheet $ 9,417 $ 7,285    
II [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 11 18    
Remaining weighted-average contract period (in years) 10 years 9 years    
Gross insured contractual payments outstanding:        
Principal $ 137,345 $ 622,820    
Interest 74,611 293,293    
Total 211,956 916,113    
Gross undiscounted claim liability 12,569 36,000    
Discount, gross claim liability 894 3,069    
Gross claim liability before all subrogation and before reinsurance 11,675 32,931    
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 11,675 32,931    
Less: Unearned premium reserves (840) (5,085)    
Plus: Loss adjustment expenses reserves 975 2,564    
Claim liability reported on Balance Sheet, before reinsurance 11,810 30,410    
Reinsurance recoverable reported on Balance Sheet $ 3,962 $ 4,223    
III [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 17 16    
Remaining weighted-average contract period (in years) 17 years 22 years    
Gross insured contractual payments outstanding:        
Principal $ 900,525 $ 1,705,464    
Interest 398,722 6,979,130    
Total 1,299,247 8,684,594    
Gross undiscounted claim liability 523,533 992,019    
Discount, gross claim liability 134,783 433,709    
Gross claim liability before all subrogation and before reinsurance 388,750 558,310    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (41,723) (136,541)    
Discount, other subrogation 3,812 67,008    
Discounted other subrogation, before reinsurance (37,911) (69,533)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 350,839 488,777    
Less: Unearned premium reserves (7,902) (36,365)    
Plus: Loss adjustment expenses reserves 5,236 (5,926)    
Claim liability reported on Balance Sheet, before reinsurance 348,173 446,486    
Reinsurance recoverable reported on Balance Sheet $ 23,604 $ 26,096    
IV [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 136 145    
Remaining weighted-average contract period (in years) 15 years 14 years    
Gross insured contractual payments outstanding:        
Principal $ 3,890,338 $ 5,407,202    
Interest 1,692,337 2,177,539    
Total 5,582,675 7,584,741    
Gross undiscounted claim liability 1,710,357 2,295,968    
Discount, gross claim liability 343,293 637,548    
Gross claim liability before all subrogation and before reinsurance 1,367,064 1,658,420    
Less:        
Gross RMBS subrogation (1,784,421) (1,809,937)    
Discount, RMBS subrogation 29,477 39,391    
Discounted RMBS subrogation, before reinsurance (1,754,944) (1,770,546)    
Less:        
Gross other subrogation (682,464) (624,654)    
Discount, other subrogation 41,743 55,088    
Discounted other subrogation, before reinsurance (640,721) (569,566)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (1,028,601) (681,692)    
Less: Unearned premium reserves (35,854) (53,987)    
Plus: Loss adjustment expenses reserves 65,762 63,499    
Claim liability reported on Balance Sheet, before reinsurance (998,693) (672,180)    
Reinsurance recoverable reported on Balance Sheet $ (11,087) $ (14,838)    
V [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 3 3    
Remaining weighted-average contract period (in years) 3 years 3 years    
Gross insured contractual payments outstanding:        
Principal $ 37,962 $ 43,140    
Interest 12,413 13,401    
Total 50,375 56,541    
Gross undiscounted claim liability 50,343 56,510    
Discount, gross claim liability 2,090 4,143    
Gross claim liability before all subrogation and before reinsurance 48,253 52,367    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (12,758) (12,880)    
Discount, other subrogation 2,519 3,774    
Discounted other subrogation, before reinsurance (10,239) (9,106)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 38,014 43,261    
Less: Unearned premium reserves (164) (209)    
Plus: Loss adjustment expenses reserves 0 0    
Claim liability reported on Balance Sheet, before reinsurance 37,850 43,052    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0