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Financial Guarantee Insurance Contracts - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Mar. 31, 2021	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2021 GBP (£)	Sep. 30, 2021 EUR (€)	Jun. 30, 2021 USD ($)	Sep. 30, 2020 GBP (£)	Sep. 30, 2020 EUR (€)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Insurance [Line Items]
Reinsurance Recoverable Credit Exposure	$ 2,000			$ 2,000		$ 1,000
Public Finance Puerto Rico Net Par Outstanding	1,054,000			1,054,000
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation	1,731,000			1,731,000		1,751,000
Financial Guarantee Insurance Contracts, Premium Receivable	$ 325,000		$ 372,000	$ 325,000	$ 372,000	$ 370,000							$ 416,000
Estimated Future Premium Payments Weighted Average Discounted Rate	2.20%			2.20%		2.20%	2.20%	2.20%
Reinsurance Payable	$ 33,000			$ 33,000		$ 27,000
Weighted average period of future premiums				8 years 1 month 6 days		8 years 3 months 18 days
Uncollectable premium receivables	10,000			$ 10,000		$ 17,000
Accelerated premium revenue for retired obligations	0		4,542	0	1,226
Reinsurance recoveries of losses included in losses and loss expenses				2,000	(14,000)
Losses and loss expense reserves ceded to reinsurers	29,000		36,000	29,000	36,000	33,000							26,000
Subrogation recoveries, net of reinsurance	(1,705,000)			(1,705,000)		(1,725,000)
Amortization of intangible assets	11,000		14,000	44,000	41,000
Intangible assets	364,000			364,000		409,000
Possible Increase in Loss Reserves Related to Puerto Rico	470,000			470,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,121,000		1,095,000	1,121,000	1,095,000	$ 1,140,000			$ 1,123,000			$ 1,129,000	$ 1,536,000
Stockholders Equity After Possible Increase in Domestic Public Finance Loss Reserves	651,000			651,000
Stockholders Equity After Possible Inability to Realize R&W Subrogation Recoveries	(585,000)			(585,000)
March 2021 Ameerican Rescue Plan Amount				1,900,000,000
Seventh Amended POA Proposed Debt Restructure Amount	35,000,000			35,000,000
Seventh Amended POA Proposed Pension Obligation Restructure Amount	$ 50,000,000			$ 50,000,000
PRIFA Trust Funded Share of Clawback CVI	27.00%			27.00%			27.00%	27.00%
Nominal Cap of Allowed PRIFA Under Seventh Amended POA	75.00%			75.00%			75.00%	75.00%
PRHTA Share of Contingent Value Instrument	69.00%			69.00%			69.00%	69.00%
CCDA Share of Contingent Value Instrument	4.00%			4.00%			4.00%	4.00%
Clawback CVI Lifetime Nominal Cap	75.00%			75.00%			75.00%	75.00%
Financial Guaranty
Insurance [Line Items]
Losses and loss expense reserves ceded to reinsurers	$ 28,000			$ 28,000
Loss Reserves [Member]
Insurance [Line Items]
Weighted average risk-free rate used to discount loss reserves		1.10%		1.60%
United Kingdom, Pounds
Insurance [Line Items]
Financial Guarantee Insurance Contracts, Premium Receivable	108,000		112,000	$ 108,000	112,000		£ 80			£ 87
Euro Member Countries, Euro
Insurance [Line Items]
Financial Guarantee Insurance Contracts, Premium Receivable	$ 16,000		$ 21,000	$ 16,000	$ 21,000			€ 14			€ 18

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- Definition

This element represents the reduction to gross claim liability for subrogation on insured RMBS financial obligations with credit deterioration, net of reinsurance.

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Insurance [Line Items]

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March 2021 Ameerican Rescue Plan Amount

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PRIFA Trust Funded Share of Clawback CVI

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Public Finance Puerto Rico Net Par Outstanding

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Reinsurance Recoverable Credit Exposure

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This element represents the reduction to gross claim liability for subrogation on insured RMBS financial obligations with credit deterioration.

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Seventh Amended POA Proposed Debt Restructure Amount

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Stockholders Equity After Possible Inability to Realize R&W Subrogation Recoveries

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Amount of the premium receivable for financial guarantee insurance contracts reported in the statement of financial position. This element primarily would consist of those financial guarantee insurance contracts which premiums are to be collected over the contract period, but may, on occasion, include premiums which are to be collected in full at inception, but which straddle a financial reporting period.

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Weighted average period over which premium receivable for financial guarantee insurance contracts is collected where premium is received over the contract period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Amount of reduction of provision for policy benefits and costs incurred for policies ceded.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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