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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Jun. 30, 2013 Successor Ambac [Member] | Apr. 30, 2013 Successor Ambac [Member] | Jun. 30, 2013 Successor Ambac [Member] Variable Interest Entity [Member] | Apr. 30, 2013 Successor Ambac [Member] Variable Interest Entity [Member] | Apr. 30, 2013 Predecessor Ambac [Member] | Mar. 31, 2013 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Jun. 30, 2012 Predecessor Ambac [Member] | Dec. 31, 2011 Predecessor Ambac [Member] | Apr. 30, 2013 Predecessor Ambac [Member] Variable Interest Entity [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Variable Interest Entity [Member]
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Assets: |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $5,676,216 in 2013 and $4,751,824 in 2012) |  | $ 5,585,275 |  | $ 2,242,989 | $ 2,500,565 |  |  | $ 5,402,395 |  |  | $ 2,500,565 | $ 2,261,294
Fixed income securities pledged as collateral, at fair value (amortized cost of $164,340 in 2013 and $265,517 in 2012) |  | 164,295 |  |  |  |  |  | 265,779 |  |  |  |
Short-term investments, at fair value (amortized cost of $611,174 in 2013 and $661,219 in 2012) |  | 611,177 |  |  |  |  |  | 661,658 |  |  |  |
Other investments, at fair value |  | 240,417 |  |  |  |  |  | 100 |  |  |  |
Total investments |  | 6,601,164 | 6,457,264 |  |  | 6,457,264 |  | 6,329,932 |  |  |  |
Cash |  | 20,515 | 152,951 |  |  | 254,851 |  | 43,837 |  |  |  |
Receivable for securities |  | 2,221 | 682 |  |  | 682 |  | 761 |  |  |  |
Investment income due and accrued |  | 35,718 | 37,961 | 1,224 | 4,851 | 37,961 |  | 39,742 |  |  | 4,851 | 4,101
Premium receivables |  | 1,464,898 | 1,531,631 |  |  | 1,531,631 |  | 1,620,621 |  |  |  |
Reinsurance recoverable on paid and unpaid losses |  | 154,964 | 151,311 |  |  | 151,311 |  | 159,086 |  |  |  |
Deferred ceded premium |  | 159,165 | 166,212 |  |  | 166,212 |  | 177,893 |  |  |  |
Subrogation recoverable |  | 501,087 | 533,673 |  |  | 533,673 |  | 497,346 |  |  |  |
Deferred acquisition costs |  |  |  |  |  | 184,953 |  | 199,160 |  |  |  |
Loans |  | 7,053 | 7,282 | 13,820,878 | 14,752,053 | 8,857 |  | 9,203 |  |  | 14,758,077 | 15,568,711
Derivative assets |  | 91,178 | 121,643 |  |  | 121,643 |  | 126,106 |  |  |  |
Current taxes |  | 4,224 | 4,410 |  |  |  |  |  |  |  |  |
Insurance intangible asset |  | 1,621,612 | 1,658,972 |  |  |  |  |  |  |  |  |
Goodwill | 514,511 | 514,511 | 514,511 |  |  |  |  |  |  |  |  |
Other assets |  | 33,738 | 54,821 | 13,222 | 13,972 | 54,821 |  | 39,715 |  |  | 13,972 | 5,467
Variable interest entity assets: |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities, at fair value |  | 5,585,275 |  | 2,242,989 | 2,500,565 |  |  | 5,402,395 |  |  | 2,500,565 | 2,261,294
Restricted cash |  |  |  | 22,994 | 24,150 |  |  |  |  |  | 24,150 | 2,290
Investment income due and accrued |  | 35,718 | 37,961 | 1,224 | 4,851 | 37,961 |  | 39,742 |  |  | 4,851 | 4,101
Loans (includes $13,820,878 and $15,359,073 at fair value) |  | 7,053 | 7,282 | 13,820,878 | 14,752,053 | 8,857 |  | 9,203 |  |  | 14,758,077 | 15,568,711
Intangible assets |  |  |  | 162,012 | 164,520 |  |  |  |  |  | 164,520 |
Other assets |  | 33,738 | 54,821 | 13,222 | 13,972 | 54,821 |  | 39,715 |  |  | 13,972 | 5,467
Total assets | 28,853,435 | 27,475,367 | 28,853,435 |  |  | 26,969,994 |  | 27,085,265 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Liabilities subject to compromise |  |  |  |  |  | 1,704,641 |  | 1,704,904 |  |  |  |
Unearned premiums |  | 2,372,807 | 2,482,314 |  |  | 2,482,314 |  | 2,778,401 |  |  |  |
Losses and loss expense reserve |  | 6,042,649 | 6,106,345 |  |  | 6,106,345 |  | 6,619,486 |  |  |  |
Ceded premiums payable |  | 89,435 | 92,468 |  |  | 92,468 |  | 94,527 |  |  |  |
Obligations under investment agreements |  | 358,610 | 358,878 |  |  | 357,373 |  | 356,091 |  |  |  |
Obligations under investment repurchase agreements |  | 5,926 | 5,926 |  |  | 5,926 |  | 5,926 |  |  |  |
Deferred taxes |  | 1,564 | 1,580 |  |  | 1,580 |  | 1,586 |  |  |  |
Current taxes |  |  |  |  |  | 97,490 |  | 96,778 |  |  |  |
Long-term debt |  | 945,940 | 940,313 | 14,268,493 | 15,023,038 | 155,271 |  | 150,170 |  |  | 15,041,624 | 15,436,008
Accrued interest payable |  | 249,387 | 233,876 | 724 | 4,318 | 252,788 |  | 228,835 |  |  | 4,318 | 3,618
Derivative liabilities |  | 451,790 | 621,645 | 1,989,783 | 2,425,517 | 621,645 |  | 531,315 |  |  | 2,425,517 | 2,221,781
Other liabilities |  | 86,663 | 90,745 | 6,628 | 6,030 | 88,908 |  | 102,488 |  |  | 6,030 | 293
Payable for securities purchased |  | 42,901 | 27 |  |  | 27 |  | 25 |  |  |  |
Variable interest entity liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest payable |  | 249,387 | 233,876 | 724 | 4,318 | 252,788 |  | 228,835 |  |  | 4,318 | 3,618
Long-term debt (includes $14,262,734 and $15,200,538 at fair value) |  | 945,940 | 940,313 | 14,268,493 | 15,023,038 | 155,271 |  | 150,170 |  |  | 15,041,624 | 15,436,008
Derivative liabilities |  | 451,790 | 621,645 | 1,989,783 | 2,425,517 | 621,645 |  | 531,315 |  |  | 2,425,517 | 2,221,781
Other liabilities |  | 86,663 | 90,745 | 6,628 | 6,030 | 88,908 |  | 102,488 |  |  | 6,030 | 293
Total liabilities | 28,393,020 | 26,913,300 | 28,393,020 |  |  | 29,444,265 |  | 30,332,232 |  |  |  |
Stockholders' equity (deficit): |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, value |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value |  | 450 |  |  |  |  |  | 3,080 |  |  |  |
Additional paid-in capital |  | 184,565 |  |  |  |  |  | 2,172,027 |  |  |  |
Accumulated other comprehensive (loss) income |  | (103,507) |  |  |  | 800,260 | 720,071 | 625,385 |  |  |  |
Retained earnings (accumulated deficit) |  | 205,681 |  |  |  | (5,697,961) |  | (6,297,264) |  |  |  |
Predecessor common stock held in treasury at cost, 5,580,657 shares at December 31, 2012 |  |  |  |  |  | (410,695) |  | (410,755) |  |  |  |
Total Ambac Financial Group, Inc. stockholders' equity (deficit) |  | 287,189 | 185,000 |  |  | (3,133,289) |  | (3,907,527) |  |  |  |
Noncontrolling interest | 275,415 | 274,878 | 275,415 |  |  | 659,018 |  | 660,560 |  |  |  |
Total stockholders' equity (deficit) |  | 562,067 | 460,415 |  |  | 275,415 |  | (3,246,967) | (3,755,379) | (3,149,533) |  |
Total liabilities and stockholders' equity (deficit) |  | $ 27,475,367 | $ 28,853,435 |  |  | $ 26,969,994 |  | $ 27,085,265 |  |  |  |

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