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Special Purpose Entities, Including Variable Interest Entities - Summary of Carrying Amount of Assets, Liabilities and Maximum Exposure to Loss of Ambac's Variable Interests in Non-Consolidated Variable Interest Entities (Detail) - Variable Interest Entity [Member] - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss $ 50,005,057  
Insurance Assets 1,271,393  
Insurance Liabilities 4,213,036  
Successor [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss   $ 56,182,335
Insurance Assets   1,889,722
Insurance Liabilities   4,202,322
Derivative Liabilities (178,628) (138,975)
Global Structured Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 23,519,783  
Insurance Assets 916,624  
Insurance Liabilities 3,832,933  
Global Structured Finance [Member] | Successor [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss   27,595,753
Insurance Assets   1,512,310
Insurance Liabilities   3,775,023
Derivative Liabilities (169,408) (114,115)
Global Public Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 26,485,274  
Insurance Assets 354,769  
Insurance Liabilities 380,103  
Global Public Finance [Member] | Successor [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss   28,586,582
Insurance Assets   377,412
Insurance Liabilities   427,299
Derivative Liabilities (9,220) (24,860)
Collateralized Debt Obligations [Member] | Global Structured Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 845,991  
Insurance Assets 231  
Insurance Liabilities 3,400  
Collateralized Debt Obligations [Member] | Global Structured Finance [Member] | Successor [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss   980,935
Insurance Assets   264
Insurance Liabilities   3,639
Derivative Liabilities (184,838) (129,525)
Residential Mortgage-Backed Securities [Member] | Global Structured Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 15,412,198  
Insurance Assets 744,303  
Insurance Liabilities 3,040,292  
Residential Mortgage-Backed Securities [Member] | Global Structured Finance [Member] | Successor [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss   17,081,002
Insurance Assets   1,279,650
Insurance Liabilities   2,680,739
Other Consumer Asset-Backed [Member] | Global Structured Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 2,419,657  
Insurance Assets 27,943  
Insurance Liabilities 289,372  
Other Consumer Asset-Backed [Member] | Global Structured Finance [Member] | Successor [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss   3,853,443
Insurance Assets   47,346
Insurance Liabilities   535,090
Derivative Liabilities 0 0
Other Commercial Asset-Backed [Member] | Global Structured Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 1,768,494  
Insurance Assets 71,686  
Insurance Liabilities 68,884  
Other Commercial Asset-Backed [Member] | Global Structured Finance [Member] | Successor [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss   2,393,805
Insurance Assets   104,033
Insurance Liabilities   94,191
Derivative Liabilities 0 0
Other [Member] | Global Structured Finance [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss 3,073,443  
Insurance Assets 72,461  
Insurance Liabilities 430,985  
Other [Member] | Global Structured Finance [Member] | Successor [Member]    
Variable Interest Entities [Line Items]    
Maximum Exposure To Loss   3,286,568
Insurance Assets   81,017
Insurance Liabilities   461,364
Derivative Liabilities $ 15,430 $ 15,410