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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
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Policies
Dec. 31, 2016
USD ($)
Policies
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Loss Reserves Ceded To Reinsurers $ 34,691 $ 30,767 $ 27,478 $ 44,059
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ (418) $ (349) $ (162)  
Number of policies | Policies 289 282    
Remaining weighted-average contract period (in years) 16 years 16 years    
Gross insured contractual payments outstanding:        
Principal $ 13,146,924 $ 13,400,162    
Interest 11,084,736 11,026,059    
Total 24,231,660 24,426,221    
Gross undiscounted claim liability 7,724,045 7,636,110    
Discount, gross claim liability 1,207,645 1,305,366    
Gross claim liability before all subrogation and before reinsurance 6,516,400 6,330,744    
Less:        
Gross RMBS subrogation (1,912,844) (1,926,165)    
Discount, RMBS subrogation 19,870 19,130    
Discounted RMBS subrogation, before reinsurance (1,892,974) (1,907,035)    
Less:        
Gross other subrogation (822,465) (739,471)    
Discount, other subrogation 85,767 80,079    
Discounted other subrogation, before reinsurance (736,698) (659,392)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 3,886,728 3,764,317    
Less: Unearned premium reserves (141,475) (143,141)    
Plus: Loss adjustment expenses reserves 85,102 74,862    
Claim liability reported on Balance Sheet, before reinsurance 3,830,355 3,696,038    
Reinsurance recoverable reported on Balance Sheet $ 34,273 $ 30,418    
I/SL [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 19 19    
Remaining weighted-average contract period (in years) 11 years 9 years    
Gross insured contractual payments outstanding:        
Principal $ 925,810 $ 918,456    
Interest 334,340 345,802    
Total 1,260,150 1,264,258    
Gross undiscounted claim liability 4,038 3,439    
Discount, gross claim liability 410 314    
Gross claim liability before all subrogation and before reinsurance 3,628 3,125    
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 3,628 3,125    
Less: Unearned premium reserves (2,324) (2,394)    
Plus: Loss adjustment expenses reserves 10,013 6,621    
Claim liability reported on Balance Sheet, before reinsurance 11,317 7,352    
Reinsurance recoverable reported on Balance Sheet $ 150 $ 120    
IA [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 20 22    
Remaining weighted-average contract period (in years) 6 years 8 years    
Gross insured contractual payments outstanding:        
Principal $ 345,593 $ 733,036    
Interest 74,931 199,631    
Total 420,524 932,667    
Gross undiscounted claim liability 1,463 21,175    
Discount, gross claim liability 86 1,243    
Gross claim liability before all subrogation and before reinsurance 1,377 19,932    
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 1,377 19,932    
Less: Unearned premium reserves (625) (1,807)    
Plus: Loss adjustment expenses reserves 203 339    
Claim liability reported on Balance Sheet, before reinsurance 955 18,464    
Reinsurance recoverable reported on Balance Sheet $ 3 $ 6,063    
II [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 35 26    
Remaining weighted-average contract period (in years) 13 years 30 years    
Gross insured contractual payments outstanding:        
Principal $ 1,656,293 $ 1,992,543    
Interest 738,349 7,080,969    
Total 2,394,642 9,073,512    
Gross undiscounted claim liability 87,521 547,550    
Discount, gross claim liability 19,176 331,234    
Gross claim liability before all subrogation and before reinsurance 68,345 216,316    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (17,848) (14,529)    
Discount, other subrogation 8,826 6,526    
Discounted other subrogation, before reinsurance (9,022) (8,003)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 59,323 208,313    
Less: Unearned premium reserves (18,733) (49,578)    
Plus: Loss adjustment expenses reserves 521 777    
Claim liability reported on Balance Sheet, before reinsurance 41,111 159,512    
Reinsurance recoverable reported on Balance Sheet $ 8,865 $ 2,737    
III [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 46 43    
Remaining weighted-average contract period (in years) 21 years 17 years    
Gross insured contractual payments outstanding:        
Principal $ 2,588,384 $ 1,779,889    
Interest 7,631,485 1,110,051    
Total 10,219,869 2,889,940    
Gross undiscounted claim liability 1,440,449 861,455    
Discount, gross claim liability 525,964 256,108    
Gross claim liability before all subrogation and before reinsurance 914,485 605,347    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (161,545) (118,272)    
Discount, other subrogation 14,160 13,426    
Discounted other subrogation, before reinsurance (147,385) (104,846)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 767,100 500,501    
Less: Unearned premium reserves (62,228) (31,785)    
Plus: Loss adjustment expenses reserves 16,206 11,036    
Claim liability reported on Balance Sheet, before reinsurance 721,078 479,752    
Reinsurance recoverable reported on Balance Sheet $ 42,314 $ 39,352    
IV [Member]        
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]        
Number of policies | Policies 166 169    
Remaining weighted-average contract period (in years) 13 years 14 years    
Gross insured contractual payments outstanding:        
Principal $ 7,581,597 $ 7,926,991    
Interest 2,291,449 2,275,421    
Total 9,873,046 10,202,412    
Gross undiscounted claim liability 6,127,145 6,139,060    
Discount, gross claim liability 656,494 710,608    
Gross claim liability before all subrogation and before reinsurance 5,470,651 5,428,452    
Less:        
Gross RMBS subrogation (1,912,844) (1,926,165)    
Discount, RMBS subrogation 19,870 19,130    
Discounted RMBS subrogation, before reinsurance (1,892,974) (1,907,035)    
Less:        
Gross other subrogation (630,230) (593,919)    
Discount, other subrogation 59,010 56,273    
Discounted other subrogation, before reinsurance (571,220) (537,646)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 3,006,457 2,983,771    
Less: Unearned premium reserves (57,199) (57,194)    
Plus: Loss adjustment expenses reserves 58,159 56,089    
Claim liability reported on Balance Sheet, before reinsurance 3,007,417 2,982,666    
Reinsurance recoverable reported on Balance Sheet $ (17,059) $ (17,854)    
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) 5 years 5 years    
Gross insured contractual payments outstanding:        
Principal $ 49,247 $ 49,247    
Interest 14,182 14,185    
Total 63,429 63,432    
Gross undiscounted claim liability 63,429 63,431    
Discount, gross claim liability 5,515 5,859    
Gross claim liability before all subrogation and before reinsurance 57,914 57,572    
Less:        
Gross RMBS subrogation 0 0    
Discount, RMBS subrogation 0 0    
Discounted RMBS subrogation, before reinsurance 0 0    
Less:        
Gross other subrogation (12,842) (12,751)    
Discount, other subrogation 3,771 3,854    
Discounted other subrogation, before reinsurance (9,071) (8,897)    
Gross claim liability, net of all subrogation and discounts, before reinsurance 48,843 48,675    
Less: Unearned premium reserves (366) (383)    
Plus: Loss adjustment expenses reserves 0 0    
Claim liability reported on Balance Sheet, before reinsurance 48,477 48,292    
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0