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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, 2015
USD ($)
Policies
Dec. 31, 2014
USD ($)
Policies
Sep. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 323 325    
Remaining weighted-average contract period (in years) 16 years 16 years    
Gross insured contractual payments outstanding:        
Principal $ 16,609,211 $ 18,322,914    
Interest 6,012,061 7,254,995    
Total 22,621,272 25,577,909    
Gross undiscounted claim liability 7,856,763 8,679,974    
Discount, gross claim liability 1,241,288 1,509,948    
Gross claim liability before all subrogation and before reinsurance 6,615,475 7,170,026    
Less:        
Gross RMBS subrogation (2,569,094) (2,541,219)    
Discount, RMBS subrogation 13,633 17,679    
Discounted RMBS subrogation, before reinsurance (2,555,461) (2,523,540) $ (2,214,430) $ (2,206,598)
Less:        
Gross other subrogation (801,390) (792,287)    
Discount, other subrogation 76,723 91,808    
Discounted other subrogation, before reinsurance (724,667) (700,479)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 3,335,347 3,946,007    
Less: Unearned premium reserves (179,120) (241,348)    
Plus: Loss adjustment expenses reserves 99,086 94,074    
Claim liability reported on Balance Sheet, before reinsurance 3,255,313 3,798,733    
Reinsurance recoverable reported on Balance Sheet $ 68,319 $ 99,838    
I/SL [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 44 36    
Remaining weighted-average contract period (in years) 7 years 8 years    
Gross insured contractual payments outstanding:        
Principal $ 2,099,540 $ 1,026,513    
Interest 730,755 418,746    
Total 2,830,295 1,445,259    
Gross undiscounted claim liability 15,820 16,360    
Discount, gross claim liability 786 1,147    
Gross claim liability before all subrogation and before reinsurance 15,034 15,213    
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 15,034 15,213    
Less: Unearned premium reserves (10,207) (10,945)    
Plus: Loss adjustment expenses reserves 0 3    
Claim liability reported on Balance Sheet, before reinsurance 4,827 4,271    
Reinsurance recoverable reported on Balance Sheet $ 641 $ 73    
IA [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 17 26    
Remaining weighted-average contract period (in years) 17 years 12 years    
Gross insured contractual payments outstanding:        
Principal $ 305,681 $ 519,291    
Interest 138,831 212,296    
Total 444,512 731,587    
Gross undiscounted claim liability 6,036 11,525    
Discount, gross claim liability 596 937    
Gross claim liability before all subrogation and before reinsurance 5,440 10,588    
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 5,440 10,588    
Less: Unearned premium reserves (2,089) (3,432)    
Plus: Loss adjustment expenses reserves 80 1,303    
Claim liability reported on Balance Sheet, before reinsurance 3,431 8,459    
Reinsurance recoverable reported on Balance Sheet $ 895 $ 890    
II [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 30 33    
Remaining weighted-average contract period (in years) 14 years 15 years    
Gross insured contractual payments outstanding:        
Principal $ 1,338,428 $ 3,091,744    
Interest 356,410 1,878,770    
Total 1,694,838 4,970,514    
Gross undiscounted claim liability 46,817 155,488    
Discount, gross claim liability 12,179 16,438    
Gross claim liability before all subrogation and before reinsurance 34,638 139,050    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (12,719) (18,034)    
Discount, other subrogation 3,538 6,069    
Discounted other subrogation, before reinsurance (9,181) (11,965)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 25,457 127,085    
Less: Unearned premium reserves (17,961) (73,749)    
Plus: Loss adjustment expenses reserves 819 1,968    
Claim liability reported on Balance Sheet, before reinsurance 8,315 55,304    
Reinsurance recoverable reported on Balance Sheet $ 67 $ 1,355    
III [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 65 69    
Remaining weighted-average contract period (in years) 19 years 21 years    
Gross insured contractual payments outstanding:        
Principal $ 3,913,273 $ 3,792,559    
Interest 2,940,877 2,765,537    
Total 6,854,150 6,558,096    
Gross undiscounted claim liability 1,639,016 2,040,402    
Discount, gross claim liability 524,462 716,812    
Gross claim liability before all subrogation and before reinsurance 1,114,554 1,323,590    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (133,640) (127,143)    
Discount, other subrogation 35,910 36,779    
Discounted other subrogation, before reinsurance (97,730) (90,364)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 1,016,824 1,233,226    
Less: Unearned premium reserves (86,842) (88,332)    
Plus: Loss adjustment expenses reserves 18,708 6,470    
Claim liability reported on Balance Sheet, before reinsurance 948,690 1,151,364    
Reinsurance recoverable reported on Balance Sheet $ 82,496 $ 110,957    
IV [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 164 160    
Remaining weighted-average contract period (in years) 14 years 12 years    
Gross insured contractual payments outstanding:        
Principal $ 8,897,699 $ 9,892,760    
Interest 1,827,031 1,979,627    
Total 10,724,730 11,872,387    
Gross undiscounted claim liability 6,076,327 6,456,139    
Discount, gross claim liability 697,119 774,611    
Gross claim liability before all subrogation and before reinsurance 5,379,208 5,681,528    
Less:        
Gross RMBS subrogation (2,569,094) (2,541,219)    
Discount, RMBS subrogation 13,633 17,679    
Discounted RMBS subrogation, before reinsurance (2,555,461) (2,523,540)    
Less:        
Gross other subrogation (641,812) (647,110)    
Discount, other subrogation 33,468 48,960    
Discounted other subrogation, before reinsurance (608,344) (598,150)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 2,215,403 2,559,838    
Less: Unearned premium reserves (61,546) (64,890)    
Plus: Loss adjustment expenses reserves 79,479 84,330    
Claim liability reported on Balance Sheet, before reinsurance 2,233,336 2,579,278    
Reinsurance recoverable reported on Balance Sheet $ (15,780) $ (13,437)    
V [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 3 1    
Remaining weighted-average contract period (in years) 6 years 6 years    
Gross insured contractual payments outstanding:        
Principal $ 54,590 $ 47    
Interest 18,157 19    
Total 72,747 66    
Gross undiscounted claim liability 72,747 60    
Discount, gross claim liability 6,146 3    
Gross claim liability before all subrogation and before reinsurance 66,601 57    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (13,219) 0    
Discount, other subrogation 3,807 0    
Discounted other subrogation, before reinsurance (9,412) 0    
Gross claim liability, net of all subrogation and discounts, before reinsurance 57,189 57    
Less: Unearned premium reserves (475) 0    
Plus: Loss adjustment expenses reserves 0 0    
Claim liability reported on Balance Sheet, before reinsurance 56,714 57    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0