Basis of Presentation and Significant Accounting Policies (Details) - 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
Fresh-Start Adjustment [Line Items]
Deferred Amounts and Junior Deferred Amounts Accrued Interest Rate											5.10%	5.10%
Business Acquisition, Percentage of Voting Interests Acquired									50.00%
Goodwill [Roll Forward]
Beginning balance										$ 514,511
Impairment loss		$ (514,511)
Ending balance									$ 514,511
Currency Translation, Weighted Average Risk Free Discount Rate	2.70%				2.70%						2.70%	2.70%
Financial Guarantee Insurance Contracts, Premium Received over Contract Period, Premium Receivable, Weighted Average Collection Period											9 years 2 months 12 days	10 years 1 month 6 days
Successor [Member]
Goodwill [Roll Forward]
Beginning balance				$ 514,511				$ 514,511		514,511	$ 514,511	$ 514,511
Impairment loss											(514,511)	0
Ending balance	$ 0				$ 514,511				514,511	514,511	0	514,511
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount										56,541	137,400	29,964
U.S. Trustee Fees										33	0	7
Professional fees										460	0	204
Gain From Cancellation and Satisfaction of Predecessor Ambac Debt										0	0	0
Fresh Start Adjustments										0	0	0
Reorganization items	$ 0	$ 0	$ 0	$ 0	$ 0	$ 2	$ 186	$ 23		493	$ 0	$ 211
Predecessor [Member]
Fresh-Start Adjustment [Line Items]
Deferred Policy Acquisition Cost, Amortization Expense									6,480
Goodwill [Roll Forward]
Beginning balance										$ 0
Ending balance									0
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount									36,433
U.S. Trustee Fees									23
Professional fees									4,483
Gain From Cancellation and Satisfaction of Predecessor Ambac Debt									(1,521,435)
Fresh Start Adjustments									(1,228,251)
Reorganization items									$ (2,745,180)