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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 426,926
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	$ 0	$ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,181	260
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,687	5,351
Financial assets:
Derivative assets	378	0
Other assets	0
Short-Term Debt	0	150,000
Financial liabilities:
Derivative liabilities	0	317
Equity Securities Excluded From Fair Value Table	20,618	20,618
Debt Securities, Available-for-sale, Amortized Cost	428,432	289,712
Debt Securities, Available-for-Sale, Current	426,926	284,621
Equity Method Investments Excluded From Fair Value	0	177
Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	131,101	157,020
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,171	247
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,687	5,351
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	132,617	162,124
Fixed Income Investments And Other Investments [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,687
Commercial Mortgage Backed Securities [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,819
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	9	34
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	1,827
Short-term Investments [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	295,825	127,601
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	10	13
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	295,815	127,588
Asset-backed Securities [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,298	5,061
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	24	14
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	2
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	2,274	5,049
Collateralized Debt Obligations [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,319	3,142
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	15	13
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	2
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	2,304	3,131
Residential Mortgage-Backed Securities [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	3,294	2,446
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	43	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	14	29
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	3,265	2,475
US Government Debt Securities [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	39,171	40,995
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	398	98
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	205	809
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	38,978	41,706
Corporate Debt Securities [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	70,690	89,192
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	590	107
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,180	3,905
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	72,280	92,990
Municipal Bonds [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	11,510	14,083
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	100	7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	279	570
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	11,689	14,646
Collateralized Mortgage Backed Securities [Member] | Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,819	2,101
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1	8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	9	34
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	1,827	2,127
Total Fair Value [Member]
Financial assets:
Cash	51,767	47,275
Reported Value Measurement [Member]
Financial assets:
Cash	51,767	47,275
Loans	0	3,434
Total financial assets	507,373	363,624
Short-Term Debt	0	152,560
Financial liabilities:
Total financial liabilities	0	152,877
Reported Value Measurement [Member] | Short-term Investments [Member]
Financial assets:
Short term investments	295,825	127,601
Reported Value Measurement [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	28,302	28,294
Reported Value Measurement [Member] | Foreign Exchange Future
Financial liabilities:
Derivative liabilities	0	317
Reported Value Measurement [Member] | Foreign Exchange Forward
Financial assets:
Derivative assets	378	0
Level 1 [Member]
Financial assets:
Cash	51,767	47,275
Total financial assets	386,763	215,871
Short-Term Debt	0	0
Financial liabilities:
Total financial liabilities	0	0
Level 1 [Member] | Short-term Investments [Member]
Financial assets:
Short term investments	295,825	127,601
Level 1 [Member] | Loans Receivable [Member]
Financial assets:
Loans	0	0
Level 1 [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	0	0
Level 1 [Member] | Foreign Exchange Future
Financial liabilities:
Derivative liabilities	0	0
Level 1 [Member] | Foreign Exchange Forward
Financial assets:
Derivative assets	0	0
Level 2 [Member]
Financial assets:
Cash	0	0
Total financial assets	92,308	116,025
Short-Term Debt	0	0
Financial liabilities:
Total financial liabilities	0	317
Level 2 [Member] | Short-term Investments [Member]
Financial assets:
Short term investments	0	0
Level 2 [Member] | Loans Receivable [Member]
Financial assets:
Loans	0	0
Level 2 [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	0	0
Level 2 [Member] | Foreign Exchange Future
Financial liabilities:
Derivative liabilities	0	317
Level 2 [Member] | Foreign Exchange Forward
Financial assets:
Derivative assets	378	0
Level 3 [Member]
Financial assets:
Cash	0	0
Total financial assets	0	3,434
Short-Term Debt	0	152,560
Financial liabilities:
Total financial liabilities	0	152,560
Level 3 [Member] | Short-term Investments [Member]
Financial assets:
Short term investments	0	0
Level 3 [Member] | Loans Receivable [Member]
Financial assets:
Loans	0	3,434
Level 3 [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	0	0
Level 3 [Member] | Foreign Exchange Future
Financial liabilities:
Derivative liabilities	0	0
Level 3 [Member] | Foreign Exchange Forward
Financial assets:
Derivative assets	0	0
Commercial Mortgage Backed Securities [Member] | Reported Value Measurement [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,819	2,101
Municipal Bonds [Member] | Reported Value Measurement [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	11,510	14,083
Corporate Debt Securities [Member] | Reported Value Measurement [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	70,690	89,192
US Government Debt Securities [Member] | Reported Value Measurement [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	39,171	40,995
Residential Mortgage-Backed Securities [Member] | Reported Value Measurement [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	3,294	2,446
Collateralized Debt Obligations [Member] | Reported Value Measurement [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,319	3,142
Asset-backed Securities [Member] | Reported Value Measurement [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,298	5,061
Fair Value, Recurring [Member]
Financial assets:
Total financial assets	486,756	342,829
Short-Term Debt	0	152,560
Financial liabilities:
Total financial liabilities	0	152,877
Fair Value, Recurring [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,819	2,101
Fair Value, Recurring [Member] | Short-term Investments [Member]
Financial assets:
Short term investments	295,825	127,601
Fair Value, Recurring [Member] | Loans Receivable [Member]
Financial assets:
Loans	0	3,434
Fair Value, Recurring [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	7,685	7,499
Fair Value, Recurring [Member] | Asset-backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,298	5,061
Fair Value, Recurring [Member] | Collateralized Debt Obligations [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,319	3,142
Fair Value, Recurring [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	3,294	2,446
Fair Value, Recurring [Member] | US Government Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	39,171	40,995
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	70,690	89,192
Fair Value, Recurring [Member] | Municipal Bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	11,510	14,083
Fair Value, Recurring [Member] | Foreign Exchange Future
Financial liabilities:
Derivative liabilities	0	317
Fair Value, Recurring [Member] | Foreign Exchange Forward
Financial assets:
Derivative assets	378	0
Fair Value, Recurring [Member] | Level 1 [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 1 [Member] | Asset-backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 1 [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 1 [Member] | US Government Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	39,171	40,995
Fair Value, Recurring [Member] | Level 1 [Member] | Corporate Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 1 [Member] | Municipal Bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 2 [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	1,819	2,101
Fair Value, Recurring [Member] | Level 2 [Member] | Asset-backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,298	5,061
Fair Value, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,319	3,142
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	3,294	2,446
Fair Value, Recurring [Member] | Level 2 [Member] | US Government Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	70,690	89,192
Fair Value, Recurring [Member] | Level 2 [Member] | Municipal Bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	11,510	14,083
Fair Value, Recurring [Member] | Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 3 [Member] | Asset-backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage-Backed Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 3 [Member] | US Government Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 3 [Member] | Corporate Debt Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	0	0
Fair Value, Recurring [Member] | Level 3 [Member] | Municipal Bonds [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 0	$ 0

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Equity Method Investments Excluded From Fair Value

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Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]

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Fair value portion of asset recognized for present right to economic benefit.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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