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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified | 8 Months Ended | 4 Months Ended | 12 Months Ended | 8 Months Ended | 4 Months Ended | 12 Months Ended
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Dec. 31, 2013 Successor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Dec. 31, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Successor Ambac [Member] | Apr. 30, 2013 Ambac Financial Group, Inc Parent Company Only [Member] Predecessor Ambac [Member] | Dec. 31, 2012 Ambac Financial Group, Inc Parent Company Only [Member] Predecessor Ambac [Member]
Cash flows from operating activities: |  |  |  |  |  |
Net income (loss) | $ 504,802 | $ 3,347,278 | $ (259,354) | $ 505,219 | $ 3,349,049 | $ (256,678)
Adjustments to reconcile net income loss to net cash used in operating activities: |  |  |  |  |  |
Equity in undistributed net (income) loss of non-debtor subsidiaries |  |  |  | (289,379) | (603,666) | 250,729
Reorganization items | 493 | (2,745,180) | 7,215 | 493 | (2,745,180) | 7,215
Junior surplus notes received from Ambac Assurance Corporation Segregated Account |  |  |  | (167,020) |  |
Net realized gains | (4,467) | (53,305) | (72,101) | (2) |  |
Decrease in current income taxes payable | 5,148 | (101,188) | 1,069 |  | (1,900) |
Share-based compensation | 1,106 |  |  | 1,106 |  |
Investment income due and accrued | 298 | 1,781 | 5,586 | (11,942) | (6) | 9
Decrease in other assets |  |  |  | (1,677) | 3,182 | 21
Other, net | (137,150) | 58,455 | 105,906 | (28,030) | (4,107) | (6,334)
Net cash provided by (used in) operating activities | 186,908 | (4,350) | (613,898) | 8,768 | (2,628) | (5,038)
Cash flows from investing activities: |  |  |  |  |  |
Proceeds from matured bonds | 613,345 | 310,218 | 1,109,468 | 14,355 |  |
Purchases of bonds | (2,213,116) | (286,633) | (798,740) | (42,506) |  |
Change in short-term investments | 455,495 | (64,956) | 121,413 | 19,360 | 2,637 | 4,583
Net cash (used in) provided by investing activities | (247,510) | 118,983 | 1,037,980 | (8,791) | 2,637 | 4,583
Cash flows from financing activities: |  |  |  |  |  |
Proceeds from warrant exercise | 16 |  |  | 16 |  |
Net cash used in financing activities | (14,979) | (5,519) | (396,244) | 16 |  |
Net cash flow | (75,581) | 109,114 | 27,838 | (7) | 9 | (455)
Cash at beginning of period | 152,951 | 43,837 | 15,999 | 50 | 41 | 496
Cash at end of period | 77,370 | 152,951 | 43,837 | 43 | 50 | 41
Cash paid during the period for: |  |  |  |  |  |
Income taxes | $ 1,656 | $ 102,129 | $ 1,493 |  | $ 1,900 |

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- Definition Junior Surplus Notes expected to be issued by the Segregated Account of Ambac Assurance to Ambac Financial Group upon Ambac Financial Group's emergence from bankruptcy. These Junior Surplus notes will be includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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