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Fair Value Measurements - Summary of Carrying Amount and Fair Value of Ambac's Financial Assets and Liabilities (Detail) - Successor [Member] - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Financial assets:
Fixed income securities	$ 3,867,547,000	$ 5,309,161,000
Short term investments	562,060,000	557,270,000
Other investments	411,604,000	431,630,000
Derivative assets	50,699,000
Other assets	4,887,000	5,979,000
Long-term Debt	2,937,771,000	991,696,000
Financial liabilities:
Derivative liabilities	61,768,000
Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Loans	4,563,091,000	11,529,384,000
Derivative assets	61,543,000
Long-term Debt	5,585,860,000	12,160,544,000
Financial liabilities:
Derivative liabilities	1,657,173,000
Total Fair Value [Member]
Financial assets:
Cash	52,505,000	623,703,000
Loans	12,189,000	10,284,000
Other assets	4,887,000	5,979,000
Total financial assets	11,637,968,000	20,835,968,000
Long-term Debt		1,369,499,000
Financial liabilities:
Liabilities for net financial guarantees written	786,156,000	4,842,402,000
Long-term debt	3,333,145,000
Total financial liabilities	11,423,665,000	20,660,491,000
Total Fair Value [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted Cash and Cash Equivalents, Current	1,024,000	978,000
Loans	4,563,091,000	11,529,384,000
Financial liabilities:
Long-term debt	5,585,860,000	12,160,544,000
Total Fair Value [Member] | Future [Member]
Financial assets:
Derivative assets	0
Reported Value Measurement [Member]
Financial assets:
Cash	52,505,000	623,703,000
Loans	10,082,000	10,358,000
Other assets	4,887,000	5,979,000
Total financial assets	11,656,736,000	20,853,695,000
Long-term Debt		1,428,680,000
Financial liabilities:
Liabilities for net financial guarantees written	(644,090,000)	3,435,438,000
Long-term debt	3,294,482,000
Total financial liabilities	9,954,756,000	19,312,708,000
Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted Cash and Cash Equivalents, Current	1,024,000	978,000
Loans	4,563,091,000	11,529,384,000
Financial liabilities:
Long-term debt	5,585,860,000	12,160,544,000
Reported Value Measurement [Member] | Future [Member]
Financial assets:
Derivative assets	0
Other Assets [Member] | Total Fair Value [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	50,699,000	73,199,000
Other Assets [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	50,699,000	73,199,000
Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	(437,000)
Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	61,543,000	54,877,000
Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	(437,000)
Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	61,543,000	54,877,000
Level 1 [Member]
Financial assets:
Cash	31,094,000	615,073,000
Loans	0	0
Other assets	0	0
Total financial assets	675,497,000	1,173,321,000
Long-term Debt		0
Financial liabilities:
Liabilities for net financial guarantees written	0	0
Long-term debt	0
Total financial liabilities	428,000	1,348,000
Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted Cash and Cash Equivalents, Current	1,024,000	978,000
Loans	0	0
Financial liabilities:
Long-term debt	0	0
Level 1 [Member] | Future [Member]
Financial assets:
Derivative assets	0
Level 1 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	0	0
Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0
Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	0	0
Level 2 [Member]
Financial assets:
Cash	21,411,000	8,630,000
Loans	0	0
Other assets	0	0
Total financial assets	3,221,212,000	4,005,195,000
Long-term Debt		1,046,511,000
Financial liabilities:
Liabilities for net financial guarantees written	0	0
Long-term debt	2,968,246,000
Total financial liabilities	10,039,727,000	12,735,499,000
Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted Cash and Cash Equivalents, Current	0	0
Loans	0	0
Financial liabilities:
Long-term debt	5,354,580,000	9,402,856,000
Level 2 [Member] | Future [Member]
Financial assets:
Derivative assets	0
Level 2 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	7,287,000	11,825,000
Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	(437,000)
Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	61,543,000	54,877,000
Level 3 [Member]
Financial assets:
Cash	0	0
Loans	12,189,000	10,284,000
Other assets	4,887,000	5,979,000
Total financial assets	7,432,005,000	15,347,011,000
Long-term Debt		322,988,000
Financial liabilities:
Liabilities for net financial guarantees written	786,156,000	4,842,402,000
Long-term debt	364,899,000
Total financial liabilities	1,383,510,000	7,923,644,000
Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Restricted Cash and Cash Equivalents, Current	0	0
Loans	4,563,091,000	11,529,384,000
Financial liabilities:
Long-term debt	231,280,000	2,757,688,000
Level 3 [Member] | Future [Member]
Financial assets:
Derivative assets	0
Level 3 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets	43,412,000	61,374,000
Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial assets:
Derivative assets - interest rate swaps - liability position	0
Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Currency Swaps [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Derivative assets	0	0
Municipal Bonds [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	970,464,000	779,834,000
Municipal Bonds [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	970,464,000	779,834,000
Municipal Bonds [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Municipal Bonds [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	970,464,000	779,834,000
Municipal Bonds [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Corporate Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	1,319,368,000	860,075,000
Corporate Obligations [Member] | Total Fair Value [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	2,718,377,000	2,914,145,000
Corporate Obligations [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	1,319,368,000	860,075,000
Corporate Obligations [Member] | Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	2,718,377,000	2,914,145,000
Corporate Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	450,000
Corporate Obligations [Member] | Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	0	0
Corporate Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	1,319,368,000	859,625,000
Corporate Obligations [Member] | Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	0	0
Corporate Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Corporate Obligations [Member] | Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial assets:
Fixed income securities	2,718,377,000	2,914,145,000
Foreign Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	34,007,000	26,543,000
Foreign Obligations [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	34,007,000	26,543,000
Foreign Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	32,906,000	25,615,000
Foreign Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	1,101,000	928,000
Foreign Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
US Government Debt Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	92,207,000	85,408,000
Fixed income securities, pledged as collateral	84,186,000	99,719,000
US Government Debt Securities [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	92,207,000	85,408,000
Fixed income securities, pledged as collateral	84,186,000	99,719,000
US Government Debt Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	92,207,000	85,408,000
Fixed income securities, pledged as collateral	84,186,000	99,719,000
US Government Debt Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	0	0
Fixed income securities, pledged as collateral	0	0
US Government Debt Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Fixed income securities, pledged as collateral	0	0
Residential Mortgage-Backed Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	278,775,000	2,251,333,000
Residential Mortgage-Backed Securities [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	278,775,000	2,251,333,000
Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	278,775,000	1,515,316,000
Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	736,017,000
Collateralized Debt Obligations [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	87,721,000	51,037,000
Collateralized Debt Obligations [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	87,721,000	51,037,000
Collateralized Debt Obligations [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Collateralized Debt Obligations [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	87,721,000	51,037,000
Collateralized Debt Obligations [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	0	0
Asset-backed Securities [Member] | Total Fair Value [Member]
Financial assets:
Fixed income securities	438,759,000	597,942,000
Asset-backed Securities [Member] | Reported Value Measurement [Member]
Financial assets:
Fixed income securities	438,759,000	597,942,000
Asset-backed Securities [Member] | Level 1 [Member]
Financial assets:
Fixed income securities	0	0
Asset-backed Securities [Member] | Level 2 [Member]
Financial assets:
Fixed income securities	366,665,000	525,402,000
Asset-backed Securities [Member] | Level 3 [Member]
Financial assets:
Fixed income securities	72,094,000	72,540,000
Short-Term [Member] | Total Fair Value [Member]
Financial assets:
Short term investments	562,060,000	557,270,000
Short-Term [Member] | Reported Value Measurement [Member]
Financial assets:
Short term investments	562,060,000	557,270,000
Short-Term [Member] | Level 1 [Member]
Financial assets:
Short term investments	454,746,000	389,299,000
Short-Term [Member] | Level 2 [Member]
Financial assets:
Short term investments	107,314,000	167,971,000
Short-Term [Member] | Level 3 [Member]
Financial assets:
Short term investments	0	0
Other [Member] | Total Fair Value [Member]
Financial assets:
Other investments	390,729,000	413,977,000
Other [Member] | Reported Value Measurement [Member]
Financial assets:
Other investments	411,604,000	431,630,000
Other [Member] | Level 1 [Member]
Financial assets:
Other investments	63,520,000	56,498,000
Other [Member] | Level 2 [Member]
Financial assets:
Other investments	0	29,750,000
Other [Member] | Level 3 [Member]
Financial assets:
Other investments	17,955,000	17,288,000
Future [Member] | Total Fair Value [Member]
Financial liabilities:
Derivative liabilities		428,000
Future [Member] | Total Fair Value [Member] | Future [Member]
Financial liabilities:
Derivative liabilities		1,348,000
Future [Member] | Reported Value Measurement [Member]
Financial liabilities:
Derivative liabilities		428,000
Future [Member] | Reported Value Measurement [Member] | Future [Member]
Financial liabilities:
Derivative liabilities		1,348,000
Future [Member] | Level 1 [Member]
Financial liabilities:
Derivative liabilities		428,000
Future [Member] | Level 1 [Member] | Future [Member]
Financial liabilities:
Derivative liabilities		1,348,000
Future [Member] | Level 2 [Member]
Financial liabilities:
Derivative liabilities		0
Future [Member] | Level 2 [Member] | Future [Member]
Financial liabilities:
Derivative liabilities		0
Future [Member] | Level 3 [Member]
Financial liabilities:
Derivative liabilities		0
Future [Member] | Level 3 [Member] | Future [Member]
Financial liabilities:
Derivative liabilities		0
Interest Rate Swap [Member] | Total Fair Value [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	0
Derivative liabilities	59,728,000
Interest Rate Swap [Member] | Total Fair Value [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	1,657,173,000
Interest Rate Swap [Member] | Reported Value Measurement [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	0
Derivative liabilities	59,728,000
Interest Rate Swap [Member] | Reported Value Measurement [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	1,657,173,000
Interest Rate Swap [Member] | Other Assets [Member] | Total Fair Value [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		(627,000)
Interest Rate Swap [Member] | Other Assets [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		(627,000)
Interest Rate Swap [Member] | Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities		81,495,000
Interest Rate Swap [Member] | Interest Rate Swaps - Liability Position [Member] | Total Fair Value [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities		2,205,264,000
Interest Rate Swap [Member] | Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities		81,495,000
Interest Rate Swap [Member] | Interest Rate Swaps - Liability Position [Member] | Reported Value Measurement [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities		2,205,264,000
Interest Rate Swap [Member] | Level 1 [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	0
Derivative liabilities	0
Interest Rate Swap [Member] | Level 1 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	0
Interest Rate Swap [Member] | Level 1 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		0
Interest Rate Swap [Member] | Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities		0
Interest Rate Swap [Member] | Level 1 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities		0
Interest Rate Swap [Member] | Level 2 [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position
Derivative liabilities	59,728,000
Interest Rate Swap [Member] | Level 2 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	1,657,173,000
Interest Rate Swap [Member] | Level 2 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		(627,000)
Interest Rate Swap [Member] | Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities		81,495,000
Interest Rate Swap [Member] | Level 2 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities		2,205,264,000
Interest Rate Swap [Member] | Level 3 [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position	0
Derivative liabilities	0
Interest Rate Swap [Member] | Level 3 [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities	0
Interest Rate Swap [Member] | Level 3 [Member] | Other Assets [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities - interest rate swaps - asset position		0
Interest Rate Swap [Member] | Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member]
Financial liabilities:
Derivative liabilities		0
Interest Rate Swap [Member] | Level 3 [Member] | Interest Rate Swaps - Liability Position [Member] | Interest Rate Swap [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Financial liabilities:
Derivative liabilities		0
Credit Derivatives [Member] | Total Fair Value [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,175,000	566,000
Credit Derivatives [Member] | Reported Value Measurement [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,175,000	566,000
Credit Derivatives [Member] | Level 1 [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	0	0
Credit Derivatives [Member] | Level 2 [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	0	0
Credit Derivatives [Member] | Level 3 [Member] | Credit Derivatives [Member]
Financial liabilities:
Derivative liabilities	1,175,000	566,000
Investments Measured at NAV as a Practical Expedient [Member]
Financial assets:
Other investments	$ 309,254,000	$ 310,441,000

X

- 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 and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
-Name Accounting Standards Codification
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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

No definition available.

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Fair value of liability associated with 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.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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