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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
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | $ 4,922 | $ 214 | $ 18,070 |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net | $ 1,659 | $ 266 | $ 1,014 | $ 299 | $ 956 | $ 13,510 | $ 1,763 | $ 3,942 | (3,238) | (20,171) | (21,819) |  |
Net realized investment gains | (29,413) | (30,201) | (47,148) | (4,862) | 68 | (6,150) | (4,180) | 4,896 | (111,624) | (5,366) | (39,284) |  |
Total revenues |  |  |  |  |  |  |  |  | 510,661 | 622,166 | 506,774 |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax income (loss) | (22,136) | (19,948) | 6,308 | 308,309 | (6,917) | (185,466) | 13,992 | (105,860) | 272,533 | (284,251) | 105,026 |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (5,134) | (44,464) | (30,709) |  |
Net income (loss) attributable to common stockholders | (20,459) | (103,845) | 4,313 | 305,704 | (19,479) | (190,905) | 7,110 | (125,441) | 185,713 | (328,715) | 74,843 |  |
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (20,459) | $ (22,159) | $ 4,313 | $ 305,704 | $ (19,479) | $ (190,905) | $ 7,110 | $ (125,441) | 267,399 | (328,715) | 74,317 |  |
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | 55,148 | (81,520) | 67,900 |  |
Gains (losses) on foreign currency translation, net of income tax provision (benefit) of $0, $0 and $0 |  |  |  |  |  |  |  |  | (47,893) | 73,586 | (122,128) |  |
Total other comprehensive income (loss), net of income tax |  |  |  |  |  |  |  |  | 6,424 | (6,661) | (54,205) |  |
Total comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | 192,137 | (335,376) | 20,638 |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Investment income |  |  |  |  |  |  |  |  | 27,525 | 24,411 | 13,493 |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  |  |  |  |  |  | (918) | (550) | (289) |  |
Net realized investment gains |  |  |  |  |  |  |  |  | 933 | 6,575 | 7 |  |
Total revenues |  |  |  |  |  |  |  |  | 25,709 | 17,286 | 13,197 |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | 8,315 | 3,913 | 11,486 |  |
Total expenses |  |  |  |  |  |  |  |  | 8,315 | 3,913 | 11,486 |  |
Pre-tax income (loss) |  |  |  |  |  |  |  |  | 17,394 | 13,373 | 1,711 |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 11,102 | 29,398 | 28,739 |  |
Income before equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  | (28,496) | (42,771) | (30,450) |  |
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 157,217 | (371,486) | 44,393 |  |
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | 185,713 | (328,715) | 74,843 |  |
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 185,713 | (328,715) | 74,843 |  |
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | 55,148 | (81,520) | 67,900 |  |
Gains (losses) on foreign currency translation, net of income tax provision (benefit) of $0, $0 and $0 |  |  |  |  |  |  |  |  | (47,893) | 73,586 | (122,128) |  |
Changes to postretirement benefit, net of tax |  |  |  |  |  |  |  |  | (1,766) | 1,273 | 23 |  |
Total other comprehensive income (loss), net of income tax |  |  |  |  |  |  |  |  | 6,424 | (6,661) | (54,205) |  |
Total comprehensive income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | $ 192,137 | $ (335,376) | 20,638 |  |
Successor [Member] | Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  | $ 35 | $ 0 | $ 0

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