Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Successor Ambac [Member]	Successor Ambac [Member] Accumulated Deficit [Member]	Successor Ambac [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Successor Ambac [Member] Preferred Stock [Member]	Successor Ambac [Member] Common Stock [Member]	Successor Ambac [Member] Additional Paid-in Capital [Member]	Successor Ambac [Member] Treasury Stock [Member]	Successor Ambac [Member] Noncontrolling Interest [Member]	Predecessor Ambac [Member]	Predecessor Ambac [Member] Accumulated Deficit [Member]	Predecessor Ambac [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Predecessor Ambac [Member] Preferred Stock [Member]	Predecessor Ambac [Member] Common Stock [Member]	Predecessor Ambac [Member] Additional Paid-in Capital [Member]	Predecessor Ambac [Member] Treasury Stock [Member]	Predecessor Ambac [Member] Noncontrolling Interest [Member]
Beginning balance at Jun. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		$ 324,682
Ending balance at Sep. 30, 2013		886,750
Beginning balance at Dec. 31, 2012										(3,246,967)	(6,297,264)	625,385	0	3,080	2,172,027	(410,755)	660,560
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income										3,522,382	3,349,049	174,875	0	0	0	0	(1,542)
Allocated Share-based Compensation Expense										(60)	(60)	0	0	0	0	0	0
Shares issued under equity plans										60	0	0	0	0	0	60	0
Temporary Equity, Elimination as Part of Reorganization										0	2,948,275	(800,260)	0	(3,080)	(2,172,027)	410,695	(383,603)
Ending balance at Apr. 30, 2013		460,415	0	0	0	450	184,550	0	275,415	275,415	0	0	0	0	0	0	275,415
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		426,319	436,656	(10,246)	0	0	0	0	(91)
Warrants exercised		16	0	0	0	0	16	0	0
Ending balance at Sep. 30, 2013		886,750	436,656	(10,246)	0	450	184,566	0	275,324
Beginning balance at Dec. 31, 2013	978,422	978,422	505,219	11,661	0	450	185,672	(19)	275,439
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		269,292	30,487	239,204	0	0	0	0	(399)
Allocated Share-based Compensation Expense		2,960	0	0	0	0	2,960	0	0
Shares issued under equity plans		0	0	0	0	0	0	0	0
Warrants exercised		16	0	0	0	0	16	0	0
Ending balance at Sep. 30, 2014	1,250,690	1,250,690	535,706	250,865	0	450	188,648	(19)	275,040
Beginning balance at Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		26,571
Ending balance at Sep. 30, 2014	$ 1,250,690	$ 1,250,690