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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statement of Total Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, Tax |  |  |  |  |  |  |  |  |  |  | $ 0
Revenues: |  |  |  |  |  |  |  |  |  |  |
Other income | $ 1,000 | $ 141,000 | $ (9,000) | $ 1,000 | $ 2,000 | $ 1,000 | $ 2,000 | $ (1,000) | $ 134,000 | $ 5,000 | 0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | 0 | 0 | 0 | 0 | (2,000) | 0 | (1,000) | 0 | 0 | (3,000) | (20,000)
Net realized investment gains | (9,000) | (18,000) | (36,000) | (17,000) | (29,000) | (30,000) | (47,000) | (5,000) | (81,000) | (112,000) | (5,000)
Total revenues |  |  |  |  |  |  |  |  | 496,000 | 511,000 | 622,000
Expenses: |  |  |  |  |  |  |  |  |  |  |
Pre-tax income (loss) | (111,000) | 69,000 | (100,000) | (41,000) | (22,000) | (20,000) | 6,000 | 308,000 | (183,000) | 273,000 | (284,000)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (32,000) | (5,000) | (44,000)
Net income (loss) attributable to common stockholders | (110,000) | 66,000 | (128,000) | (43,000) | (20,000) | (104,000) | 4,000 | 306,000 | (216,000) | 186,000 | (329,000)
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (110,000) | $ 66,000 | $ (128,000) | $ (43,000) | $ (20,000) | $ (22,000) | $ 4,000 | $ 306,000 | (216,000) | 267,000 | (329,000)
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | 65,000 | 55,000 | (82,000)
Gains (losses) on foreign currency translation, net of income tax provision (benefit) of $0, $0 and $0 |  |  |  |  |  |  |  |  | 26,000 | (48,000) | 74,000
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax |  |  |  |  |  |  |  |  | 0 | 1,000 | 0
Total other comprehensive income (loss), net of income tax |  |  |  |  |  |  |  |  | 91,000 | 6,000 | (7,000)
Total comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (125,000) | 192,000 | (335,000)
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  |  |  |  |  |  |  |  | (8,000) | 2,000 | 0
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, Tax |  |  |  |  |  |  |  |  | 0 | 0 |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | 19,000 | 28,000 | 24,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  |  |  |  |  |  | (2,000) | (1,000) | (1,000)
Net realized investment gains |  |  |  |  |  |  |  |  | (1,000) | 1,000 | 7,000
Total revenues |  |  |  |  |  |  |  |  | 18,000 | 26,000 | 17,000
Expenses: |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | 16,000 | 8,000 | 4,000
Total expenses |  |  |  |  |  |  |  |  | 16,000 | 8,000 | 4,000
Pre-tax income (loss) |  |  |  |  |  |  |  |  | 2,000 | 17,000 | 13,000
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 5,000 | 11,000 | 29,000
Income before equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (7,000) | (28,000) | (43,000)
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (223,000) | 157,000 | (371,000)
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (216,000) | 186,000 | (329,000)
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (216,000) | 186,000 | (329,000)
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | 65,000 | 55,000 | (82,000)
Gains (losses) on foreign currency translation, net of income tax provision (benefit) of $0, $0 and $0 |  |  |  |  |  |  |  |  | 26,000 | (48,000) | 74,000
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax |  |  |  |  |  |  |  |  | 0 | 1,000 | 0
Changes to postretirement benefit, net of tax |  |  |  |  |  |  |  |  | (1,000) | (2,000) | 1,000
Total other comprehensive income (loss), net of income tax |  |  |  |  |  |  |  |  | 91,000 | 6,000 | (7,000)
Total comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | (125,000) | 192,000 | (335,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Tax Effect |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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