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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Stockholders' Equity (Detail) - USD ($)
$ in Thousands
12 Months Ended 18 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Total comprehensive income (loss) $ 273,823 $ (335,376) $ 20,112    
Stock-based compensation (11,854) (4,293) (5,253)    
Cost of shares (acquired) issued under equity plan (1,158) (1,547) (505)    
Payments for Repurchase of Warrants     2,717 $ 8,092  
Stock Issued During Period, Value, New Issues 1 1 2    
Noncontrolling Interest, Decrease from Deconsolidation     (2,469)    
Proceeds from Warrant Exercises 3 0 2    
AMPS Impact on Stockholders Equity (296,634)        
Ending balance 1,633,147 1,645,258 1,978,024 1,978,024  
Stockholders' Equity Attributable to Parent 1,591,997 1,381,148      
Retained Earnings [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Total comprehensive income (loss) 267,399 (328,715) 74,843    
Cost of shares (acquired) issued under equity plan (1,156) (1,572) (127)    
Payments for Repurchase of Warrants     1,916    
Stock Issued During Period, Value, New Issues 0 0      
AMPS Impact on Stockholders Equity (81,686)        
Ending balance 1,421,302 1,233,845 1,557,681 1,557,681  
AOCI Attributable to Parent [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Total comprehensive income (loss) 6,424 (6,661) (54,205)    
Stock Issued During Period, Value, New Issues 0 0      
Ending balance (48,715) (52,239) (38,990) (38,990)  
Preferred Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Value, New Issues   0      
Ending balance 0 0 0 0  
Common Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Value, New Issues 1 1 2    
Proceeds from Warrant Exercises 0   0    
Ending balance 454 453 452 452  
Additional Paid-in Capital [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation (11,854) (4,293) (5,253)    
Payments for Repurchase of Warrants     801    
Stock Issued During Period, Value, New Issues 0 0 0    
Proceeds from Warrant Exercises 3   2    
AMPS Impact on Stockholders Equity 8,012        
Ending balance 219,429 199,560 195,267 195,267  
Common Stock Held in Treasury, at Cost [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cost of shares (acquired) issued under equity plan (2) 25 (378)    
Proceeds from Warrant Exercises 0        
Ending balance (473) (471) (496) (496)  
Noncontrolling Interest [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Total comprehensive income (loss) 0 0 (526)    
Noncontrolling Interest, Decrease from Deconsolidation     (2,469)    
AMPS Impact on Stockholders Equity (222,960)        
Ending balance 41,150 264,110 264,110 264,110  
Ambac Financial Group, Inc Parent Company Only [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Total comprehensive income (loss) 192,137 (335,376) 20,638    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 0 (137) 6,442    
Stock-based compensation (11,854) (4,293) (5,253)    
Cost of shares (acquired) issued under equity plan (1,158) (1,547) (505)    
Payments for Repurchase of Warrants 0 0 (2,717)    
Stock Issued During Period, Value, New Issues 1 1 2    
Proceeds from Warrant Exercises 3 0 2    
AMPS Impact on Stockholders Equity 8,012        
Stockholders' Equity Attributable to Parent 1,591,997 1,381,148 1,713,914 1,713,914 $ 1,684,799
Ambac Financial Group, Inc Parent Company Only [Member] | Retained Earnings [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Total comprehensive income (loss) 185,713 (328,715) 74,843    
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   (137) 6,442    
Cost of shares (acquired) issued under equity plan (1,156) (1,572) (127)    
Payments for Repurchase of Warrants     (1,916)    
AMPS Impact on Stockholders Equity 0        
Stockholders' Equity Attributable to Parent 1,421,302 1,233,845 1,557,681 1,557,681 1,478,439
Ambac Financial Group, Inc Parent Company Only [Member] | AOCI Attributable to Parent [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Total comprehensive income (loss) 6,424 (6,661) (54,205)    
Stockholders' Equity Attributable to Parent (48,715) (52,239) (38,990) (38,990) 15,215
Ambac Financial Group, Inc Parent Company Only [Member] | Preferred Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stockholders' Equity Attributable to Parent 0 0 0 0 0
Ambac Financial Group, Inc Parent Company Only [Member] | Common Stock [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock Issued During Period, Value, New Issues 1 1 2    
Proceeds from Warrant Exercises 0   0    
Stockholders' Equity Attributable to Parent 454 453 452 452 450
Ambac Financial Group, Inc Parent Company Only [Member] | Additional Paid-in Capital [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation (11,854) (4,293) (5,253)    
Payments for Repurchase of Warrants     (801)    
Stock Issued During Period, Value, New Issues 0 0 0    
Proceeds from Warrant Exercises 3   2    
AMPS Impact on Stockholders Equity 8,012        
Stockholders' Equity Attributable to Parent 219,429 199,560 195,267 195,267 190,813
Ambac Financial Group, Inc Parent Company Only [Member] | Common Stock Held in Treasury, at Cost [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation   0      
Cost of shares (acquired) issued under equity plan (2) 25 (378)    
Proceeds from Warrant Exercises     0    
Stockholders' Equity Attributable to Parent (473) (471) (496) $ (496) $ (118)
Accounting Standards Update 2014-13 [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     0    
Accounting Standards Update 2014-13 [Member] | Retained Earnings [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     6,442    
Accounting Standards Update 2014-13 [Member] | Noncontrolling Interest [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification     $ (6,442)    
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 2,900        
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ (2,900)        
Accounting Standards Update 2018-02 [Domain] | AOCI Attributable to Parent [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   (6,588)      
Accounting Standards Update 2018-02 [Domain] | Ambac Financial Group, Inc Parent Company Only [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   0      
Accounting Standards Update 2018-02 [Domain] | Ambac Financial Group, Inc Parent Company Only [Member] | Retained Earnings [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   6,588      
Accounting Standards Update 2018-02 [Domain] | Ambac Financial Group, Inc Parent Company Only [Member] | AOCI Attributable to Parent [Member]          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ (6,588)