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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, 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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