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 Apr. 30, 2013		$ 460,415	$ 0	$ 0	$ 0	$ 450	$ 184,550	$ 0	$ 275,415
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		101,637	205,681	(103,507)	0	0	0	0	(537)
Warrants exercised		15	0	0	0	0	15	0	0
Ending balance at Jun. 30, 2013		562,067	205,681	(103,507)	0	450	184,565	0	274,878
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)
Stock-based compensation										(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										275,415	0	0	0	0	0	0	275,415
Beginning balance at Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income										3,145,485
Ending balance at Apr. 30, 2013										275,415
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		242,721	(51,963)	294,667	0	0	0	0	17
Stock-based compensation		2,387	0	0	0	0	2,387	0	0
Shares issued under equity plans		0	0	0	0	0	0	0	0
Warrants exercised		1	0	0	0	0	1	0	0
Ending balance at Jun. 30, 2014	1,223,531	1,223,531	453,256	306,328	0	450	188,060	(19)	275,456
Beginning balance at Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income		(6,130)
Ending balance at Jun. 30, 2014	$ 1,223,531	$ 1,223,531