Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	5 Months Ended	9 Months Ended	4 Months Ended
	Sep. 30, 2013 Successor Ambac [Member]	Sep. 30, 2014 Successor Ambac [Member]	Apr. 30, 2013 Predecessor Ambac [Member]
Cash flows from operating activities:
Other comprehensive (loss) income, after tax:	$ 436,656	$ 30,487	$ 3,349,049
Noncontrolling interest in subsidiaries’ earnings	(367)	(242)	(1,771)
Net (loss) income	436,289	30,245	3,347,278
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	1,243	2,223	974
Amortization of bond premium and discount	(15,056)	(50,432)	(60,146)
Pre-tax (loss) income from continuing operations	428	211	(2,745,180)
Share-based compensation	0	2,960	0
Deferred income taxes	31	(23)	(6)
Current income taxes	821	47	(101,188)
Deferred acquisition costs	0	0	14,207
Unearned premiums, net	(164,551)	(284,355)	(172,549)
Losses and loss expenses, net	(158,706)	59,741	(43,284)
Ceded premiums payable	(6,440)	(9,858)	(2,059)
Investment income due and accrued	3,846	4,845	1,781
Premium receivables	95,621	186,389	88,990
Accrued interest payable	37,454	81,956	23,953
Amortization of insurance intangible assets	62,425	109,878	0
Net mark-to-market (gains) losses	(74,760)	(11,491)	63,828
Net realized investment gains	(8,162)	(29,401)	(53,305)
Other-than-temporary impairment charges	40,039	24,157	467
Variable interest entity activities	(59,707)	34,574	(426,566)
Other, net	(106,559)	106,703	62,122
Net cash provided by (used in) operating activities	84,256	258,369	(683)
Cash flows from investing activities:
Proceeds from sales of bonds	622,608	1,727,142	310,916
Proceeds from matured bonds	461,436	896,936	307,472
Purchases of bonds	(1,400,547)	(2,547,727)	(286,633)
Proceeds from sales of other invested assets	59,449	40,173	0
Purchases of other invested assets	(127,237)	(54,768)	(164,368)
Change in short-term investments	177,385	(279,781)	(64,956)
Loans, net	1,134	112	1,920
Change in swap collateral receivable	10,889	(105,354)	(8,863)
Other, net	(1,667)	6,553	19,828
Net cash (used in) provided by investing activities	(196,550)	(316,714)	115,316
Cash flows from financing activities:
Proceeds From The Sale Of Junior Surplus Notes	0	224,262	0
Paydowns of variable interest entity secured borrowing	(7,566)	0	(5,519)
Proceeds from warrant exercise	16	15	0
Payments From Drawdowns Of Borrowings Under Guaranteed Investment Agreements	(4,556)	(199,970)	0
Net cash provided by (used in) financing activities	(12,106)	24,307	(5,519)
Net cash flow	(124,400)	(34,038)	109,114
Cash and cash equivalents at beginning of period	152,951	77,370	43,837
Cash and cash equivalents end of period	28,551	43,332	152,951
Supplemental disclosure of cash flow information:
Income taxes	336	3,246	102,129
Interest on variable interest entity secured borrowing	163	0	276
Interest on investment agreements	640	459	444
Cash payments related to reorganization items:
Professional fees paid for services rendered in connection with the Chapter 11 proceeding	$ 15,478	$ 272	$ 3,860