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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended | 18 Months Ended |
--- | --- | --- | --- | ---
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, 2016 | Aug. 03, 2018
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
AMPS Exchange Dollar Value Warrants Issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,012
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion (Amortization) of Discounts and Premiums, Investments |  |  |  |  |  |  |  |  | (136,772) | (182,997) | (150,061) |  |
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) |  |
Decrease in current income taxes payable |  |  |  |  |  |  |  |  | (35,498) | (26,272) | 9,727 |  |
Share-based compensation |  |  |  |  |  |  |  |  | 11,854 | 4,293 | 5,253 |  |
Investment income due and accrued |  |  |  |  |  |  |  |  | 4,967 | 9,425 | (750) |  |
Other, net |  |  |  |  |  |  |  |  | 62,013 | 13,036 | (41,130) |  |
Net cash used in operating activities |  |  |  |  |  |  |  |  | (1,543,263) | (221,270) | 830,306 |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from matured bonds |  |  |  |  |  |  |  |  | 431,736 | 813,990 | 1,317,215 |  |
Purchases of bonds |  |  |  |  |  |  |  |  | (528,156) | (2,053,693) | (2,574,285) |  |
Change in short-term investments |  |  |  |  |  |  |  |  | 126,742 | (126,891) | (206,002) |  |
Proceeds from Sale and Maturity of Other Investments |  |  |  |  |  |  |  |  | 158,846 | 349,799 | 131,703 |  |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | 383 | (16,792) | 3,042 |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | 1,587,856 | 1,163,439 | (453,087) |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Warrants |  |  |  |  |  |  |  |  |  |  | 2,717 | $ 8,092 |
AMPS Exchange Cash Paid |  |  |  |  |  |  |  |  | (11,048) |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  |  |  |  | 3 | 0 | 2 |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | (585,378) | (412,180) | (318,982) |  |
Cash and Cash Equivalents, Period Increase (Decrease) |  |  |  |  |  |  |  |  | (541,188) | 528,783 | 54,332 |  |
Cash and cash equivalents at beginning of period |  |  |  | 623,703 |  |  |  | 91,025 | 623,703 | 91,025 |  |  |
Cash and cash equivalents end of period | 63,089 |  |  |  | 623,703 |  |  |  | 63,089 | 623,703 | 91,025 | 91,025 |
Cash paid during the period for: |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 34,980 | 40,334 | 21,437 |  |
Ambac Financial Group, Inc Parent Company Only [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 185,713 | (328,715) | 74,843 |  |
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed net (income) loss of non-debtor subsidiaries |  |  |  |  |  |  |  |  | (157,217) | 371,486 | (44,393) |  |
Accretion (Amortization) of Discounts and Premiums, Investments |  |  |  |  |  |  |  |  | (7,284) | (16,724) | (7,208) |  |
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net |  |  |  |  |  |  |  |  | 918 | 550 | 289 |  |
Net realized investment gains |  |  |  |  |  |  |  |  | 933 | 6,575 | 7 |  |
Decrease in current income taxes payable |  |  |  |  |  |  |  |  | (14,776) | (854) | 42,126 |  |
Share-based compensation |  |  |  |  |  |  |  |  | 11,854 | 4,293 | 5,253 |  |
Investment income due and accrued |  |  |  |  |  |  |  |  | (491) | (57) | (149) |  |
Decrease in other assets |  |  |  |  |  |  |  |  | 11,741 | (10,814) | 646 |  |
Other, net |  |  |  |  |  |  |  |  | 247 | (9,960) | 5,814 |  |
Net cash used in operating activities |  |  |  |  |  |  |  |  | 31,638 | 15,780 | 77,228 |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from matured bonds |  |  |  |  |  |  |  |  | 230,448 | 186,747 | 269,459 |  |
Purchases of bonds |  |  |  |  |  |  |  |  | (136,534) | (195,853) | (279,582) |  |
Change in short-term investments |  |  |  |  |  |  |  |  | (123,465) | (2,961) | (18,491) |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (20,648) | (44,082) | (42,287) |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Warrants |  |  |  |  |  |  |  |  | 0 | 0 | (2,717) |  |
AMPS Exchange Cash Paid |  |  |  |  |  |  |  |  | (11,048) |  |  |  |
Proceeds from Warrant Exercises |  |  |  |  |  |  |  |  | 3 | 0 | 2 |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | 3 | 0 | (2,715) |  |
Cash and Cash Equivalents, Period Increase (Decrease) |  |  |  |  |  |  |  |  | 10,993 | (28,302) | 32,226 |  |
Cash and cash equivalents at beginning of period |  |  |  | $ 3,949 |  |  |  | $ 32,251 | 3,949 | 32,251 | 25 |  |
Cash and cash equivalents end of period | $ 14,942 |  |  |  | $ 3,949 |  |  |  | 14,942 | 3,949 | 32,251 | $ 32,251 |
Cash paid during the period for: |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  | 3,674 | 784 | 635 |  |
Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale and Maturity of Other Investments |  |  |  |  |  |  |  |  | 24,523 | (34,688) | (4,664) |  |
Payments for (Proceeds from) Other Investing Activities |  |  |  |  |  |  |  |  | $ (4,572) | $ 2,673 | $ (9,009) |  |

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount 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. Includes effect from exchange rate changes. + References No definition available. + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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- Definition The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting. + References No definition available. + Details
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