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Insurance Contracts - Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable (Phantom) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense $ 383,969 $ 349,062    
Liability for Claims 383,969 349,062    
Ceded Loss And Loss Expenses Paid Not Yet Recovered     $ 35,146  
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 78,556      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 305,414 $ 270,081 $ 215,490 $ 156,301
Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 305,414      
Operating Segments | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 383,969      
Liability for Claims 383,969      
Operating Segments | Commercial Auto        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 148,616      
Liability for Claims 148,616      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 123,361      
Operating Segments | Commercial Auto | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 25,255      
Operating Segments | Excess and General Liability        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 74,404      
Liability for Claims 74,404      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 63,632      
Operating Segments | Excess and General Liability | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 10,772      
Operating Segments | Workers' Compensation Insurance        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 16,604      
Liability for Claims 16,604      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 0      
Operating Segments | Workers' Compensation Insurance | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 16,604      
Operating Segments | Non-standard Personal Auto        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 7,051      
Liability for Claims 7,051      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 395      
Operating Segments | Non-standard Personal Auto | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 6,656      
Operating Segments | General Liability        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 52,081      
Liability for Claims 52,081      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 41,653      
Operating Segments | General Liability | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 10,428      
Operating Segments | Professional Liability Insurance        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 27,853      
Liability for Claims 27,853      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 25,833      
Operating Segments | Professional Liability Insurance | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 2,020      
Operating Segments | Surety Product Line        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 12,250      
Liability for Claims 12,250      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 12,250      
Operating Segments | Surety Product Line | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 0      
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Unallocated Loss Adjustment Expense Reserve        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 14,066      
Liability for Claims 14,066      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 8,168      
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Unallocated Loss Adjustment Expense Reserve | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 5,898      
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Other Insurance Contracts        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Liability for Claims and Claims Adjustment Expense 31,044      
Liability for Claims 31,044      
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 30,122      
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment | Other Insurance Contracts | Specialty Property & Casualty Program        
Financial Guarantee Insurance Contracts, Claim Liability [Line Items]        
Short-Duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 922