Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Carrying Amount [Member]
Financial assets:
Other Investments	$ 106,000	$ 89,000
Cash	21,000	33,000
Loans	3,000	3,000
Other assets		1,000
Total financial assets	9,268,000	10,071,000
Financial liabilities:
Liabilities for net financial guarantees written	(866,000)	(740,000)
Long-term Debt	2,806,000	3,255,000
Total financial liabilities	8,190,000	8,958,000
Carrying Amount [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	2,000	2,000
Loans, at fair value	2,718,000	2,998,000
Financial liabilities:
Long-term Debt	4,216,000	4,493,000
Carrying Amount [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	690,000	595,000
Carrying Amount [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	414,000	492,000
Carrying Amount [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	3,320,000	3,215,000
Carrying Amount [Member] \| Municipal Bonds [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	136,000	139,000
Carrying Amount [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities	94,000	114,000
Carrying Amount [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,940,000	1,835,000
Carrying Amount [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	38,000	41,000
Total Fair Value [Member]
Financial assets:
Cash	21,000	33,000
Debt Securities, Available-for-sale	2,265,000
Other Investments	690,000	595,000
Derivative assets	76,000	93,000
Other assets	114
Financial liabilities:
Derivative liabilities	95,000	114,000
Credit valuation adjustment included in fair value of credit derivative liabilities	$ 32	$ 19
Estimated Future Premium Payments Weighted Average Discounted Rate	2.20%	2.20%
Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	$ 3,455,000	$ 3,354,000
Loans, at fair value	2,718,000	2,998,000
Derivative assets	38,000	41,000
Financial liabilities:
Derivative liabilities	1,940,000	1,835,000
Long-term Debt	$ 4,056,000	$ 4,324,000
Estimated Future Premium Payments Weighted Average Discounted Rate	3.00%	2.40%
Short-term Investments [Member]
Financial assets:
Debt Securities, Available-for-sale	$ 414,000	$ 492,000
Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	3,320,000	3,215,000
Municipal Bonds [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	136,000	139,000
Other Assets [Member] \| Carrying Amount [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	76,000	93,000
Fair Value Measured at Net Asset Value Per Share [Member]
Financial assets:
Other Investments	577,000	453,000
Level 1 [Member]
Financial assets:
Cash	21,000	32,000
Total financial assets	750,000	888,000
Financial liabilities:
Liabilities for net financial guarantees written	0	0
Long-term Debt	0	0
Total financial liabilities	0	0
Level 1 [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	2,000	2,000
Loans	0	0
Financial liabilities:
Long-term Debt	0	0
Level 1 [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	106,000	91,000
Level 1 [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	369,000	415,000
Level 1 [Member] \| Equity Method Investments [Member]
Financial assets:
Other assets		0
Level 1 [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Level 1 [Member] \| Municipal Bonds [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Level 1 [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 1 [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 1 [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	0	0
Level 1 [Member] \| Loans Receivable [Member]
Financial assets:
Loans	0	0
Level 1 [Member] \| Other Assets [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	0	0
Level 2 [Member]
Financial assets:
Cash	1,000	2,000
Total financial assets	1,732,000	2,299,000
Financial liabilities:
Liabilities for net financial guarantees written	0	0
Long-term Debt	2,575,000	2,670,000
Total financial liabilities	8,695,000	8,968,000
Level 2 [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	0	0
Loans	0	0
Financial liabilities:
Long-term Debt	4,086,000	4,349,000
Level 2 [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	0	0
Level 2 [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	46,000	76,000
Level 2 [Member] \| Equity Method Investments [Member]
Financial assets:
Other assets		0
Level 2 [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Level 2 [Member] \| Municipal Bonds [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	136,000	139,000
Level 2 [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities	94,000	114,000
Level 2 [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,940,000	1,835,000
Level 2 [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	38,000	41,000
Level 2 [Member] \| Loans Receivable [Member]
Financial assets:
Loans	0	0
Level 2 [Member] \| Other Assets [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	5,000	9,000
Level 3 [Member]
Financial assets:
Cash	0	0
Total financial assets	6,202,000	6,433,000
Financial liabilities:
Liabilities for net financial guarantees written	(112,000)	539,000
Long-term Debt	22,000	401,000
Total financial liabilities	79,000	1,095,000
Level 3 [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	0	0
Loans	2,718,000	2,998,000
Financial liabilities:
Long-term Debt	169,000	155,000
Level 3 [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	0	53,000
Level 3 [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	0	0
Level 3 [Member] \| Equity Method Investments [Member]
Financial assets:
Other assets		1,000
Level 3 [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	3,320,000	3,215,000
Level 3 [Member] \| Municipal Bonds [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Level 3 [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 3 [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	0	0
Level 3 [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	0	0
Level 3 [Member] \| Loans Receivable [Member]
Financial assets:
Loans	3,000	3,000
Level 3 [Member] \| Other Assets [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	71,000	85,000
Municipal Bonds [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	340,000	358,000
Corporate Debt Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	613,000	1,077,000
Debt Security, Government, Non-US [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	87,000	98,000
US Government Debt Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	45,000	106,000
Residential Mortgage-Backed Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	252,000	302,000
Collateralized Debt Obligations [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	128,000	74,000
Asset-backed Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	265,000	303,000
Fair Value, Recurring [Member]
Financial assets:
Total financial assets	9,261,000	10,073,000
Financial liabilities:
Liabilities for net financial guarantees written	(112,000)	539,000
Long-term Debt	2,598,000	3,071,000
Total financial liabilities	8,775,000	10,063,000
Fair Value, Recurring [Member] \| Variable Interest Entity [Member]
Financial assets:
Restricted cash	2,000	2,000
Loans	2,718,000	2,998,000
Financial liabilities:
Long-term Debt	4,255,000	4,504,000
Fair Value, Recurring [Member] \| Other Debt Obligations [Member]
Financial assets:
Other Investments	683,000	597,000
Fair Value, Recurring [Member] \| Short-term Investments [Member]
Financial assets:
Short term investments	414,000	492,000
Fair Value, Recurring [Member] \| Equity Method Investments [Member]
Financial assets:
Other assets		1,000
Fair Value, Recurring [Member] \| Asset-backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	265,000	303,000
Fair Value, Recurring [Member] \| Collateralized Debt Obligations [Member]
Financial assets:
Debt Securities, Available-for-sale	128,000	74,000
Fair Value, Recurring [Member] \| Residential Mortgage-Backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	252,000	302,000
Fair Value, Recurring [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	45,000	106,000
Fair Value, Recurring [Member] \| Debt Security, Government, Non-US [Member]
Financial assets:
Debt Securities, Available-for-sale	87,000	98,000
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	613,000	1,077,000
Fair Value, Recurring [Member] \| Corporate Debt Securities [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	3,320,000	3,215,000
Fair Value, Recurring [Member] \| Municipal Bonds [Member]
Financial assets:
Debt Securities, Available-for-sale	340,000	358,000
Fair Value, Recurring [Member] \| Municipal Bonds [Member] \| Variable Interest Entity [Member]
Financial assets:
Debt Securities, Available-for-sale	136,000	139,000
Fair Value, Recurring [Member] \| Interest Rate Swaps [Member]
Financial liabilities:
Derivative liabilities	94,000	114,000
Fair Value, Recurring [Member] \| Interest Rate Swaps [Member] \| Variable Interest Entity [Member]
Financial liabilities:
Derivative liabilities	1,940,000	1,835,000
Fair Value, Recurring [Member] \| Currency Swaps [Member] \| Variable Interest Entity [Member]
Financial assets:
Derivative assets	38,000	41,000
Fair Value, Recurring [Member] \| Loans Receivable [Member]
Financial assets:
Loans	3,000	3,000
Fair Value, Recurring [Member] \| Other Assets [Member] \| Interest Rate Swaps [Member]
Financial assets:
Derivative assets	76,000	93,000
Fair Value, Recurring [Member] \| Level 1 [Member] \| Asset-backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 1 [Member] \| Collateralized Debt Obligations [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 1 [Member] \| Residential Mortgage-Backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 1 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	45,000	106,000
Fair Value, Recurring [Member] \| Level 1 [Member] \| Debt Security, Government, Non-US [Member]
Financial assets:
Debt Securities, Available-for-sale	87,000	98,000
Fair Value, Recurring [Member] \| Level 1 [Member] \| Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	1,000	4,000
Fair Value, Recurring [Member] \| Level 1 [Member] \| Municipal Bonds [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 2 [Member] \| Asset-backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	187,000	225,000
Fair Value, Recurring [Member] \| Level 2 [Member] \| Collateralized Debt Obligations [Member]
Financial assets:
Debt Securities, Available-for-sale	128,000	74,000
Fair Value, Recurring [Member] \| Level 2 [Member] \| Residential Mortgage-Backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	252,000	302,000
Fair Value, Recurring [Member] \| Level 2 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 2 [Member] \| Debt Security, Government, Non-US [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 2 [Member] \| Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	600,000	1,073,000
Fair Value, Recurring [Member] \| Level 2 [Member] \| Municipal Bonds [Member]
Financial assets:
Debt Securities, Available-for-sale	340,000	358,000
Fair Value, Recurring [Member] \| Level 3 [Member] \| Asset-backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	79,000	78,000
Fair Value, Recurring [Member] \| Level 3 [Member] \| Collateralized Debt Obligations [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 3 [Member] \| Residential Mortgage-Backed Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 3 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 3 [Member] \| Debt Security, Government, Non-US [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Fair Value, Recurring [Member] \| Level 3 [Member] \| Corporate Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	12,000	0
Fair Value, Recurring [Member] \| Level 3 [Member] \| Municipal Bonds [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Collateral Pledged [Member]
Financial assets:
Debt Securities, Available-for-sale	120,000	140,000
Collateral Pledged [Member] \| US Government Debt Securities [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	15,000	15,000
Collateral Pledged [Member] \| Short-term Investments [Member] \| Carrying Amount [Member]
Financial assets:
Debt Securities, Available-for-sale	105,000	125,000
Collateral Pledged [Member] \| Fair Value, Recurring [Member] \| Short-term Investments [Member]
Financial assets:
Debt Securities, Available-for-sale	105,000	125,000
Collateral Pledged [Member] \| Fair Value, Recurring [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	15,000	15,000
Collateral Pledged [Member] \| Fair Value, Recurring [Member] \| Level 1 [Member] \| Short-term Investments [Member]
Financial assets:
Debt Securities, Available-for-sale	105,000	125,000
Collateral Pledged [Member] \| Fair Value, Recurring [Member] \| Level 1 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	15,000	15,000
Collateral Pledged [Member] \| Fair Value, Recurring [Member] \| Level 2 [Member] \| Short-term Investments [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Collateral Pledged [Member] \| Fair Value, Recurring [Member] \| Level 2 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Collateral Pledged [Member] \| Fair Value, Recurring [Member] \| Level 3 [Member] \| Short-term Investments [Member]
Financial assets:
Debt Securities, Available-for-sale	0	0
Collateral Pledged [Member] \| Fair Value, Recurring [Member] \| Level 3 [Member] \| US Government Debt Securities [Member]
Financial assets:
Debt Securities, Available-for-sale	$ 0	$ 0

Weighted average discounted rate of estimated future premium payments to be paid by the VIEs.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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- Definition

Amount 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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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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- Definition

Amount of credit risk valuation adjustment to derivative liabilities to properly reflect the credit quality of the entity.

+ References

No definition available.

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

Fair value portion of investments accounted under the equity method.

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- Definition

Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services.

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