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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, 2016
USD ($)
Policies
Dec. 31, 2015
USD ($)
Policies
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 296 293
Remaining weighted-average contract period (in years) 16 years 15 years
Gross insured contractual payments outstanding:    
Principal $ 14,303,665 $ 15,976,009
Interest 11,449,449 11,867,941
Total 25,753,114 27,843,950
Gross undiscounted claim liability 7,242,558 8,192,193
Discount, gross claim liability 829,981 1,333,663
Gross claim liability before all subrogation and before reinsurance 6,412,577 6,858,530
Less:    
Gross RMBS subrogation (1,936,829) (2,841,291)
Discount, RMBS subrogation 13,573 11,716
Discounted RMBS subrogation, before reinsurance (1,923,256) (2,829,575)
Less:    
Gross other subrogation (1,084,746) (1,388,070)
Discount, other subrogation 172,625 334,251
Discounted other subrogation, before reinsurance (912,121) (1,053,819)
Gross claim liability, net of all subrogation and discounts, before reinsurance 3,577,200 2,975,136
Less: Unearned premium reserves (157,042) (189,587)
Plus: Loss adjustment expenses reserves 83,756 73,264
Claim liability reported on Balance Sheet, before reinsurance 3,503,914 2,858,813
Reinsurance recoverable reported on Balance Sheet $ 24,441 $ 43,999
I/SL [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 32 33
Remaining weighted-average contract period (in years) 9 years 9 years
Gross insured contractual payments outstanding:    
Principal $ 1,780,294 $ 1,830,549
Interest 733,068 724,940
Total 2,513,362 2,555,489
Gross undiscounted claim liability 6,798 6,188
Discount, gross claim liability 387 515
Gross claim liability before all subrogation and before reinsurance 6,411 5,673
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 6,411 5,673
Less: Unearned premium reserves (3,774) (3,360)
Plus: Loss adjustment expenses reserves 8,977 0
Claim liability reported on Balance Sheet, before reinsurance 11,614 2,313
Reinsurance recoverable reported on Balance Sheet $ 699 $ 642
IA [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 25 14
Remaining weighted-average contract period (in years) 14 years 17 years
Gross insured contractual payments outstanding:    
Principal $ 541,278 $ 263,288
Interest 152,233 107,624
Total 693,511 370,912
Gross undiscounted claim liability 6,349 5,632
Discount, gross claim liability 475 652
Gross claim liability before all subrogation and before reinsurance 5,874 4,980
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 5,874 4,980
Less: Unearned premium reserves (2,255) (1,796)
Plus: Loss adjustment expenses reserves 160 66
Claim liability reported on Balance Sheet, before reinsurance 3,779 3,250
Reinsurance recoverable reported on Balance Sheet $ 946 $ 880
II [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 21 23
Remaining weighted-average contract period (in years) 28 years 26 years
Gross insured contractual payments outstanding:    
Principal $ 1,743,119 $ 1,912,237
Interest 6,804,123 6,834,538
Total 8,547,242 8,746,775
Gross undiscounted claim liability 183,255 173,930
Discount, gross claim liability 88,544 96,218
Gross claim liability before all subrogation and before reinsurance 94,711 77,712
Less:    
Gross RMBS subrogation 0 0
Discount, RMBS subrogation 0 0
Discounted RMBS subrogation, before reinsurance 0 0
Less:    
Gross other subrogation (8,968) (12,937)
Discount, other subrogation 2,198 3,961
Discounted other subrogation, before reinsurance (6,770) (8,976)
Gross claim liability, net of all subrogation and discounts, before reinsurance 87,941 68,736
Less: Unearned premium reserves (46,411) (48,871)
Plus: Loss adjustment expenses reserves 572 629
Claim liability reported on Balance Sheet, before reinsurance 42,102 20,494
Reinsurance recoverable reported on Balance Sheet $ 177 $ 85
III [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 47 63
Remaining weighted-average contract period (in years) 18 years 19 years
Gross insured contractual payments outstanding:    
Principal $ 1,992,587 $ 2,972,615
Interest 1,389,838 1,792,525
Total 3,382,425 4,765,140
Gross undiscounted claim liability 847,307 1,595,525
Discount, gross claim liability 186,037 458,805
Gross claim liability before all subrogation and before reinsurance 661,270 1,136,720
Less:    
Gross RMBS subrogation 0 0
Discount, RMBS subrogation 0 0
Discounted RMBS subrogation, before reinsurance 0 0
Less:    
Gross other subrogation (226,073) (526,957)
Discount, other subrogation 59,125 198,643
Discounted other subrogation, before reinsurance (166,948) (328,314)
Gross claim liability, net of all subrogation and discounts, before reinsurance 494,322 808,406
Less: Unearned premium reserves (38,390) (63,257)
Plus: Loss adjustment expenses reserves 15,761 15,090
Claim liability reported on Balance Sheet, before reinsurance 471,693 760,239
Reinsurance recoverable reported on Balance Sheet $ 39,241 $ 59,503
IV [Member]    
Schedule of Insured Financial Obligations with Credit Deterioration [Line Items]    
Number of policies | Policies 168 157
Remaining weighted-average contract period (in years) 15 years 13 years
Gross insured contractual payments outstanding:    
Principal $ 8,197,140 $ 8,942,730
Interest 2,354,765 2,391,523
Total 10,551,905 11,334,253
Gross undiscounted claim liability 6,134,180 6,339,537
Discount, gross claim liability 550,510 770,694
Gross claim liability before all subrogation and before reinsurance 5,583,670 5,568,843
Less:    
Gross RMBS subrogation (1,936,829) (2,841,291)
Discount, RMBS subrogation 13,573 11,716
Discounted RMBS subrogation, before reinsurance (1,923,256) (2,829,575)
Less:    
Gross other subrogation (836,767) (835,078)
Discount, other subrogation 108,342 127,669
Discounted other subrogation, before reinsurance (728,425) (707,409)
Gross claim liability, net of all subrogation and discounts, before reinsurance 2,931,989 2,031,859
Less: Unearned premium reserves (65,811) (71,848)
Plus: Loss adjustment expenses reserves 58,286 57,479
Claim liability reported on Balance Sheet, before reinsurance 2,924,464 2,017,490
Reinsurance recoverable reported on Balance Sheet $ (16,622) $ (17,111)
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) 6 years 6 years
Gross insured contractual payments outstanding:    
Principal $ 49,247 $ 54,590
Interest 15,422 16,791
Total 64,669 71,381
Gross undiscounted claim liability 64,669 71,381
Discount, gross claim liability 4,028 6,779
Gross claim liability before all subrogation and before reinsurance 60,641 64,602
Less:    
Gross RMBS subrogation 0 0
Discount, RMBS subrogation 0 0
Discounted RMBS subrogation, before reinsurance 0 0
Less:    
Gross other subrogation (12,938) (13,098)
Discount, other subrogation 2,960 3,978
Discounted other subrogation, before reinsurance (9,978) (9,120)
Gross claim liability, net of all subrogation and discounts, before reinsurance 50,663 55,482
Less: Unearned premium reserves (401) (455)
Plus: Loss adjustment expenses reserves 0 0
Claim liability reported on Balance Sheet, before reinsurance 50,262 55,027
Reinsurance recoverable reported on Balance Sheet $ 0 $ 0