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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 01, 2013
Assets:          
Debt Securities, Available-for-sale $ 3,546,006        
Junior surplus note of Ambac Assurance Segregated Account         $ 350,000
Short-term investments, at cost (approximates fair value) 3,451,149 $ 5,271,818      
Other Investments 391,217 431,630      
Total investments 3,937,223 5,740,791      
Investment income due and accrued 11,576 16,532      
Other assets 112,788 46,614      
Total assets 14,588,711 23,192,374      
Tolling Payment Payable to AFG 44,381 30,496      
Liabilities:          
Total liabilities 12,955,564 21,547,116      
Stockholders' equity (deficit):          
Preferred stock 0 0      
Common stock 454 453      
Additional paid-in capital 219,429 199,560      
Accumulated other comprehensive income (loss) (48,715) (52,239) $ (38,990)    
Retained earnings 1,421,302 1,233,845      
Common stock held in treasury at cost (473) (471)      
Total Ambac Financial Group, Inc. stockholders’ equity 1,591,997 1,381,148      
Total liabilities and stockholders’ equity 14,588,711 23,192,374      
Ambac Financial Group, Inc Parent Company Only [Member]          
Assets:          
Short-term investments, at cost (approximates fair value) 151,007 239,476      
Other Investments 40,168 64,691      
Total investments 381,358 364,277      
Cash 14,942 3,949      
Investment in subsidiaries 1,147,883 968,392      
Investment income due and accrued 820 329      
Current taxes receivable 44,353 29,576      
Other assets 3,205 14,946      
Total assets 1,592,561 1,381,469      
Liabilities:          
Accounts payable and other liabilities 564 321      
Total liabilities 564 321      
Stockholders' equity (deficit):          
Preferred stock 0 0      
Common stock 454 453      
Additional paid-in capital 219,429 199,560      
Accumulated other comprehensive income (loss) (48,715) (52,239)      
Retained earnings 1,421,302 1,233,845      
Common stock held in treasury at cost (473) (471)      
Total Ambac Financial Group, Inc. stockholders’ equity 1,591,997 1,381,148 $ 1,713,914 $ 1,684,799  
Total liabilities and stockholders’ equity 1,592,561 1,381,469      
Short-term Investments [Member]          
Assets:          
Debt Securities, Available-for-sale 430,331 557,270      
Short-term investments, at cost (approximates fair value) 430,405 557,476      
Short-term Investments [Member] | Ambac Financial Group, Inc Parent Company Only [Member]          
Assets:          
Short-term investments, at cost (approximates fair value) 192,996 69,531      
Fixed Income Securities [Member]          
Assets:          
Debt Securities, Available-for-sale 3,115,675 4,652,172      
Short-term investments, at cost (approximates fair value) 3,020,744 4,614,623      
Fixed Income Securities [Member] | Ambac Financial Group, Inc Parent Company Only [Member]          
Assets:          
Debt Securities, Available-for-sale $ 148,194 $ 230,055