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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 | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Apr. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  | $ 4,364 | $ 7,150 | $ 12,498
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  |  |  |  |  |  |  | (46,764) | (25,659) | (25,794)
Net realized investment gains |  |  |  |  |  |  |  |  |  | (4,467) | (53,476) | (58,777)
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  | 581,048 | 644,658 | 328,670
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Reorganization items | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 2 | $ 186 | $ 23 |  | 493 | 0 | 211
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries | $ 395,576 | $ (388,193) | $ 286,095 | $ 216,580 | $ 459,594 | $ 84,773 | $ (210,412) | $ 159,298 |  | 512,316 | 510,058 | 493,253
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | (7,514) | (17,364) | (9,557)
Net income (loss) |  |  |  |  |  |  |  |  |  | 504,802 | 492,694 | 483,696
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 504,802 | 492,694 | 483,696
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  |  | (41,910) | (159,730) | 252,603
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  |  | 43,165 | (45,025) | (43,599)
Total other comprehensive income |  |  |  |  |  |  |  |  |  | 12,102 | (205,442) | 208,188
Total comprehensive income attributable to Ambac Financial Group, Inc. |  |  |  |  |  |  |  |  |  | 516,880 | 288,335 | 692,693
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | $ 8,363 |  |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  |  |  |  |  |  | (467) |  |  |
Net realized investment gains |  |  |  |  |  |  |  |  | (53,305) |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  | 640,388 |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Reorganization items |  |  |  |  |  |  |  |  | (2,745,180) |  |  |
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  |  | 3,348,033 |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (755) |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 3,347,278 |  |  |
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 3,347,278 |  |  |
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | 175,347 |  |  |
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | (428) |  |  |
Total other comprehensive income |  |  |  |  |  |  |  |  | 175,104 |  |  |
Total comprehensive income attributable to Ambac Financial Group, Inc. |  |  |  |  |  |  |  |  | 3,523,924 |  |  |
Ambac Financial Group, Inc Parent Company Only [Member] | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 22,227 | 9,826 | 25,147
Other income |  |  |  |  |  |  |  |  |  | 197,122 | 0 | 0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  |  |  |  |  |  |  |  | (155) |
Net realized investment gains |  |  |  |  |  |  |  |  |  | (2) | 27 | 46
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  |  | 219,351 | 9,644 | 25,101
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 3,018 | 8,922 | 6,458
Total expenses |  |  |  |  |  |  |  |  |  | 3,018 | 8,922 | 6,458
Income (loss) before income taxes, reorganization costs and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  |  |  | 216,333 | 722 | 18,643
Reorganization items |  |  |  |  |  |  |  |  |  | 493 | 0 | 211
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  |  |  | 215,840 | 722 | 18,432
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 0 | 70,811 | (221)
Income before equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  |  | 215,840 | 71,533 | 18,211
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  |  | 289,379 | 421,870 | 465,860
Net income (loss) |  |  |  |  |  |  |  |  |  | 505,219 | 493,403 | 484,071
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 505,219 | 493,403 | 484,071
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  |  | (41,910) | (159,730) | 252,603
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  |  | 42,724 | (44,651) | (43,165)
Changes to postretirement benefit, net of tax |  |  |  |  |  |  |  |  |  | 10,847 | (687) | (816)
Total other comprehensive income |  |  |  |  |  |  |  |  |  | 11,661 | (205,068) | 208,622
Total comprehensive income attributable to Ambac Financial Group, Inc. |  |  |  |  |  |  |  |  |  | $ 516,880 | $ 288,335 | $ 692,693
Ambac Financial Group, Inc Parent Company Only [Member] | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 39 |  |  |
Other income |  |  |  |  |  |  |  |  | 0 |  |  |
Net realized investment gains |  |  |  |  |  |  |  |  | 0 |  |  |
Total revenues before expenses and reorganization items |  |  |  |  |  |  |  |  | 39 |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 539 |  |  |
Total expenses |  |  |  |  |  |  |  |  | 539 |  |  |
Income (loss) before income taxes, reorganization costs and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  |  | (500) |  |  |
Reorganization items |  |  |  |  |  |  |  |  | (2,745,180) |  |  |
Income (loss) before income taxes and equity in undistributed net loss of subsidiaries |  |  |  |  |  |  |  |  | 2,744,680 |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 703 |  |  |
Income before equity in undistributed net income of subsidiaries |  |  |  |  |  |  |  |  | 2,745,383 |  |  |
Equity in undistributed net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 603,666 |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 3,349,049 |  |  |
Other comprehensive income, after tax: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 3,349,049 |  |  |
Unrealized gains (losses) on securities, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | 175,347 |  |  |
Gains (losses) on foreign currency translation, net of deferred income taxes of $0 |  |  |  |  |  |  |  |  | (657) |  |  |
Changes to postretirement benefit, net of tax |  |  |  |  |  |  |  |  | 185 |  |  |
Total other comprehensive income |  |  |  |  |  |  |  |  | 174,875 |  |  |
Total comprehensive income attributable to Ambac Financial Group, Inc. |  |  |  |  |  |  |  |  | $ 3,523,924 |  |  |

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