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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	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 264,055
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	$ 0	$ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,439	260
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3,286	5,351
Financial assets:
Derivative assets	790	0
Other assets	0
Short-Term Debt	150,000	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	265,902	289,712
Debt Securities, Available-for-Sale, Current	264,055	284,621
Equity Method Investments Excluded From Fair Value	89	177
Fixed Income Securities [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	161,335	157,020
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,438	247
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	3,286	5,351
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	163,183	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	3,286
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	1,920
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	17	34
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	1,935
Short-term Investments [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt Securities, Available-for-Sale	102,720	127,601
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1	13
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	102,719	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	2,561	5,061
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	19	14
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2	2
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	2,544	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	2,652	3,142
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11	13
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1	2
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	2,642	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	3,362	2,446
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	28	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	18	29
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	3,352	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	44,432	40,995
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	496	98
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	308	809
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	44,244	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	92,100	89,192
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	773	107
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,599	3,905
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	93,926	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	14,308	14,083
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	109	7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	341	570
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	14,540	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	1,920	2,101
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2	8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	17	34
Financial liabilities:
Debt Securities, Available-for-sale, Amortized Cost	1,935	2,127
Total Fair Value [Member]
Financial assets:
Cash	47,085	47,276
Reported Value Measurement [Member]
Financial assets:
Cash	47,085	47,276
Loans	3,503	3,434
Total financial assets	343,626	363,625
Short-Term Debt	152,944	152,560
Financial liabilities:
Total financial liabilities	152,944	152,877
Reported Value Measurement [Member] | Short-term Investments [Member]
Financial assets:
Short term investments	102,720	127,601
Reported Value Measurement [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	28,193	28,294
Reported Value Measurement [Member] | Warrants [Member]
Financial assets:
Derivative assets	0	0
Reported Value Measurement [Member] | Foreign Exchange Future
Financial liabilities:
Derivative liabilities	0	317
Reported Value Measurement [Member] | Foreign Exchange Forward
Financial assets:
Derivative assets	790	0
Level 1 [Member]
Financial assets:
Cash	47,085	47,276
Total financial assets	194,326	215,872
Short-Term Debt	152,944	0
Financial liabilities:
Total financial liabilities	152,944	0
Level 1 [Member] | Short-term Investments [Member]
Financial assets:
Short term investments	102,720	127,601
Level 1 [Member] | Loans Receivable [Member]
Financial assets:
Loans	0	0
Level 1 [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	89	0
Level 1 [Member] | Warrants [Member]
Financial assets:
Derivative assets	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	117,693	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] | Warrants [Member]
Financial assets:
Derivative assets	0	0
Level 2 [Member] | Foreign Exchange Future
Financial liabilities:
Derivative liabilities	0	317
Level 2 [Member] | Foreign Exchange Forward
Financial assets:
Derivative assets	790	0
Level 3 [Member]
Financial assets:
Cash	0	0
Total financial assets	3,503	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	3,503	3,434
Level 3 [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	0	0
Level 3 [Member] | Warrants [Member]
Financial assets:
Derivative assets	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	1,920	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	14,308	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	92,100	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	44,432	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	3,362	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	2,652	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	2,561	5,061
Fair Value, Recurring [Member]
Financial assets:
Total financial assets	322,919	342,830
Short-Term Debt	152,944	152,560
Financial liabilities:
Total financial liabilities	152,944	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	1,920	2,101
Fair Value, Recurring [Member] | Short-term Investments [Member]
Financial assets:
Short term investments	102,720	127,601
Fair Value, Recurring [Member] | Loans Receivable [Member]
Financial assets:
Loans	3,503	3,434
Fair Value, Recurring [Member] | Other Debt Obligations [Member]
Financial assets:
Other investments	7,486	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	2,561	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	2,652	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	3,362	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	44,432	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	92,100	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	14,308	14,083
Fair Value, Recurring [Member] | Warrants [Member]
Financial assets:
Derivative assets	0	0
Fair Value, Recurring [Member] | Foreign Exchange Future
Financial liabilities:
Derivative liabilities	0	317
Fair Value, Recurring [Member] | Foreign Exchange Forward
Financial assets:
Derivative assets	790	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	44,432	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	1,920	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	2,561	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	2,652	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	3,362	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	92,100	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	14,308	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 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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