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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) - Successor [Member]
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Policies
Dec. 31, 2017
USD ($)
Policies
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Loss Reserves Ceded To Reinsurers $ 25,326 $ 40,658 $ 46,023 $ 30,767
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 185 $ 339 $ (47)  
Number of policies | Policies 238 277    
Remaining weighted-average contract period (in years) 16 years 17 years    
Gross insured contractual payments outstanding:        
Principal $ 9,349,047 $ 11,687,070    
Interest 10,408,781 11,197,612    
Total 19,757,828 22,884,682    
Gross undiscounted claim liability 3,618,286 8,025,561    
Discount, gross claim liability 1,261,877 1,291,005    
Gross claim liability before all subrogation and before reinsurance 2,356,409 6,734,556    
Less:        
Gross RMBS subrogation (1,814,915) (1,857,502)    
Discount, RMBS subrogation 38,667 23,115    
Discounted RMBS subrogation, before reinsurance (1,776,248) (1,834,387)    
Less:        
Gross other subrogation (743,518) (827,078)    
Discount, other subrogation 133,266 86,822    
Discounted other subrogation, before reinsurance (610,252) (740,256)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (30,091) 4,159,913    
Less: Unearned premium reserves (105,255) (135,502)    
Plus: Loss adjustment expenses reserves 105,219 89,391    
Claim liability reported on Balance Sheet, before reinsurance (30,127) 4,113,802    
Reinsurance recoverable reported on Balance Sheet $ 25,511 $ 40,997    
I/SL [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 33 26    
Remaining weighted-average contract period (in years) 9 years 10 years    
Gross insured contractual payments outstanding:        
Principal $ 1,058,679 $ 1,046,267    
Interest 493,847 531,657    
Total 1,552,526 1,577,924    
Gross undiscounted claim liability 4,130 4,434    
Discount, gross claim liability 552 465    
Gross claim liability before all subrogation and before reinsurance 3,578 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 3,578 3,969    
Less: Unearned premium reserves (1,302) (2,126)    
Plus: Loss adjustment expenses reserves 2,117 16,116    
Claim liability reported on Balance Sheet, before reinsurance 4,393 17,959    
Reinsurance recoverable reported on Balance Sheet $ 275 $ 202    
IA [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 25 20    
Remaining weighted-average contract period (in years) 22 years 23 years    
Gross insured contractual payments outstanding:        
Principal $ 535,358 $ 531,190    
Interest 558,077 584,098    
Total 1,093,435 1,115,288    
Gross undiscounted claim liability 55,554 56,659    
Discount, gross claim liability 14,667 13,095    
Gross claim liability before all subrogation and before reinsurance 40,887 43,564    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (9,585) (7,990)    
Discount, other subrogation 6,716 5,169    
Discounted other subrogation, before reinsurance (2,869) (2,821)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 38,018 40,743    
Less: Unearned premium reserves (9,656) (9,990)    
Plus: Loss adjustment expenses reserves 3,240 3,242    
Claim liability reported on Balance Sheet, before reinsurance 31,602 33,995    
Reinsurance recoverable reported on Balance Sheet $ 4,279 $ 4,894    
II [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 11 26    
Remaining weighted-average contract period (in years) 7 years 10 years    
Gross insured contractual payments outstanding:        
Principal $ 356,714 $ 1,199,909    
Interest 151,446 413,045    
Total 508,160 1,612,954    
Gross undiscounted claim liability 37,858 77,289    
Discount, gross claim liability 3,450 12,250    
Gross claim liability before all subrogation and before reinsurance 34,408 65,039    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (23) (9,371)    
Discount, other subrogation 0 2,550    
Discounted other subrogation, before reinsurance (23) (6,821)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 34,385 58,218    
Less: Unearned premium reserves (1,688) (12,238)    
Plus: Loss adjustment expenses reserves 2,256 665    
Claim liability reported on Balance Sheet, before reinsurance 34,953 46,645    
Reinsurance recoverable reported on Balance Sheet $ 8,736 $ 9,424    
III [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 18 22    
Remaining weighted-average contract period (in years) 22 years 24 years    
Gross insured contractual payments outstanding:        
Principal $ 1,744,554 $ 1,998,861    
Interest 6,980,654 7,182,715    
Total 8,725,208 9,181,576    
Gross undiscounted claim liability 1,101,833 1,412,976    
Discount, gross claim liability 513,413 643,897    
Gross claim liability before all subrogation and before reinsurance 588,420 769,079    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (123,326) (53,070)    
Discount, other subrogation 59,749 8,349    
Discounted other subrogation, before reinsurance (63,577) (44,721)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 524,843 724,358    
Less: Unearned premium reserves (36,993) (46,086)    
Plus: Loss adjustment expenses reserves 12,101 13,331    
Claim liability reported on Balance Sheet, before reinsurance 499,951 691,603    
Reinsurance recoverable reported on Balance Sheet $ 27,837 $ 38,465    
IV [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 148 179    
Remaining weighted-average contract period (in years) 13 years 13 years    
Gross insured contractual payments outstanding:        
Principal $ 5,609,816 $ 6,862,281    
Interest 2,209,528 2,469,765    
Total 7,819,344 9,332,046    
Gross undiscounted claim liability 2,359,788 6,409,340    
Discount, gross claim liability 724,685 616,559    
Gross claim liability before all subrogation and before reinsurance 1,635,103 5,792,781    
Less:        
Gross RMBS subrogation (1,814,915) (1,857,502)    
Discount, RMBS subrogation 38,667 23,115    
Discounted RMBS subrogation, before reinsurance (1,776,248) (1,834,387)    
Less:        
Gross other subrogation (597,581) (743,456)    
Discount, other subrogation 62,645 67,045    
Discounted other subrogation, before reinsurance (534,936) (676,411)    
Gross claim liability, net of all subrogation and discounts, before reinsurance (676,081) 3,281,983    
Less: Unearned premium reserves (55,391) (64,786)    
Plus: Loss adjustment expenses reserves 85,505 56,037    
Claim liability reported on Balance Sheet, before reinsurance (645,967) 3,273,234    
Reinsurance recoverable reported on Balance Sheet $ (15,616) $ (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 $ 43,926 $ 48,562    
Interest 15,229 16,332    
Total 59,155 64,894    
Gross undiscounted claim liability 59,123 64,863    
Discount, gross claim liability 5,110 4,739    
Gross claim liability before all subrogation and before reinsurance 54,013 60,124    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (13,003) (13,191)    
Discount, other subrogation 4,156 3,709    
Discounted other subrogation, before reinsurance (8,847) (9,482)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 45,166 50,642    
Less: Unearned premium reserves (225) (276)    
Plus: Loss adjustment expenses reserves 0 0    
Claim liability reported on Balance Sheet, before reinsurance 44,941 50,366    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0