Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	2 Months Ended	6 Months Ended	4 Months Ended
	Jun. 30, 2013 Successor Ambac [Member]	Jun. 30, 2014 Successor Ambac [Member]	Apr. 30, 2013 Predecessor Ambac [Member]
Cash flows from operating activities:
Net (loss) income attributable to common shareholders	$ 205,681	$ (51,963)	$ 3,349,049
Noncontrolling interest in subsidiaries’ earnings	(399)	(221)	(1,771)
Net income (loss)	205,282	(52,184)	3,347,278
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	501	1,481	974
Amortization of bond premium and discount	(3,240)	(64,392)	(60,146)
Reorganization items	424	209	(2,745,180)
Share-based compensation	0	2,387	0
Deferred income taxes	(16)	115	(6)
Current income taxes	186	(2,226)	(101,188)
Deferred acquisition costs	0	0	14,207
Unearned premiums, net	(102,460)	(174,117)	(172,549)
Losses and loss expenses, net	(34,763)	129,931	(43,284)
Ceded premiums payable	(3,033)	(6,222)	(2,059)
Investment income due and accrued	2,243	3,145	1,781
Premium receivables	66,733	96,659	88,990
Accrued interest payable	15,511	45,158	23,953
Amortization of insurance intangible assets	24,952	67,970	0
Net mark-to-market (gains) losses	(45,146)	(4,671)	63,828
Net realized investment gains	(18,472)	(19,356)	(53,305)
Other-than-temporary impairment charges	2,002	19,146	467
Variable interest entity activities	(4,598)	43,690	(426,566)
Other, net	(66,543)	85,546	62,122
Net cash provided by (used in) operating activities	39,563	172,269	(683)
Cash flows from investing activities:
Proceeds from sales of bonds	343,040	993,721	310,916
Proceeds from matured bonds	182,304	496,099	307,472
Purchases of bonds	(746,914)	(1,323,098)	(286,633)
Proceeds from sales of other invested assets	1,228	40,173	(164,368)
Purchases of other invested assets	(79,596)	(33,528)	0
Change in short-term investments	115,437	(73,068)	(64,956)
Loans, net	230	(170)	1,920
Change in swap collateral receivable	10,889	(90,616)	(8,863)
Other, net	4,678	5,308	19,828
Net cash (used in) provided by investing activities	(168,704)	14,821	115,316
Cash flows from financing activities:
Paydowns of variable interest entity secured borrowing	(3,310)	0	(5,519)
Proceeds from warrant exercise	15	1	0
Payments From Drawdowns Of Borrowings Under Guaranteed Investment Agreements		(190,000)
Net cash provided by (used in) financing activities	(3,295)	(189,999)	(5,519)
Net cash flow	(132,436)	(2,909)	109,114
Cash and cash equivalents at beginning of period	152,951	77,370	43,837
Cash and cash equivalents end of period	20,515	74,461	152,951
Supplemental disclosure of cash flow information:
Income taxes	336	3,167	102,129
Interest on variable interest entity secured borrowing	90	0	276
Interest on investment agreements	203	366	444
Cash payments related to reorganization items:
Professional fees paid for services rendered in connection with the Chapter 11 proceeding	$ 795	$ 267	$ 3,860