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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statement of Total Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues: |  |  |
Other income | $ 3,000 | $ 134,000 | $ 5,000
Net realized investment gains | (22,000) | (81,000) | (108,000)
Total revenues | 156,000 | 496,000 | 511,000
Expenses: |  |  |
Pre-tax income (loss) | (440,000) | (183,000) | 273,000
Income tax expense (benefit) | 3,000 | (32,000) | (5,000)
Net income (loss) attributable to common stockholders | (437,000) | (216,000) | 186,000
Other comprehensive income, after tax: |  |  |
Net income (loss) | (437,000) | (216,000) | 267,000
Unrealized gains (losses) on securities, net of deferred income taxes of $0 | 15,000 | 65,000 | 55,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 23,000 | 26,000 | (48,000)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax | 1,000 | 0 | 1,000
Total other comprehensive income (loss), net of income tax | 37,000 | 91,000 | 6,000
Total comprehensive income (loss) attributable to common stockholders | (400,000) | (125,000) | 192,000
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 | 1,000 | (8,000) | 2,000
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 | 0
Revenues: |  |  |
Investment income | 13,000 | (1,000) | (2,000)
Net realized investment gains | 1,000 | 2,000 | 2,000
Total revenues | 12,000 | 18,000 | 26,000
Expenses: |  |  |
Operating Expenses | 19,000 | 16,000 | 8,000
Pre-tax income (loss) | (7,000) | 2,000 | 17,000
Income tax expense (benefit) | 0 | 5,000 | 11,000
Income before equity in undistributed net income (loss) of subsidiaries | 7,000 | (7,000) | (28,000)
Equity in undistributed net income (loss) of subsidiaries | (430,000) | (223,000) | 157,000
Net income (loss) attributable to common stockholders | (437,000) | (216,000) | 186,000
Other comprehensive income, after tax: |  |  |
Net income (loss) | (437,000) | (216,000) | 186,000
Unrealized gains (losses) on securities, net of deferred income taxes of $0 | 15,000 | 65,000 | 55,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | 23,000 | 26,000 | (48,000)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax | 1,000 | 0 | 1,000
Changes to postretirement benefit, net of tax | (3,000) | (1,000) | (2,000)
Total other comprehensive income (loss), net of income tax | 37,000 | 91,000 | 6,000
Total comprehensive income (loss) attributable to common stockholders | (400,000) | (125,000) | 192,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Tax Effect | $ 0 | $ 0 | $ 0

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