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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 Successor Ambac [Member] | Jun. 30, 2013 Successor Ambac [Member] Municipal Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Corporate Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Foreign Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] U.S. government obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] U.S. Agency Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Residential Mortgage-Backed Securities [Member] | Jun. 30, 2013 Successor Ambac [Member] Collateralized Debt Obligations [Member] | Jun. 30, 2013 Successor Ambac [Member] Asset-Backed Securities [Member] | Jun. 30, 2013 Successor Ambac [Member] Collateralized Investments [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Municipal Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Corporate Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Foreign Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] U.S. government obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] U.S. Agency Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Residential Mortgage-Backed Securities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Collateralized Debt Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Asset-Backed Securities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Collateralized Investments [Member]
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost | $ 5,676,216 | $ 1,696,216 | $ 1,008,545 | $ 109,147 | $ 251,513 | $ 53,390 | $ 1,500,052 | $ 47,645 | $ 1,009,708 |  | $ 4,751,824 | $ 1,662,124 | $ 999,554 | $ 67,347 | $ 127,037 | $ 79,295 | $ 1,096,202 | $ 32,855 | $ 687,410 |
Amortized cost, short-term investments | 611,174 |  |  |  |  |  |  |  |  |  | 661,219 |  |  |  |  |  |  |  |  |
Investment other than available for sale securities pledged as collateral amortized cost basis | 6,287,390 |  |  |  |  |  |  |  |  |  | 5,413,043 |  |  |  |  |  |  |  |  |
Amortized cost basis of securities pledged as collateral | 164,340 |  |  |  | 164,340 |  |  |  |  |  | 265,517 |  |  |  | 265,517 |  |  |  |  |
Amortized Cost available-for-sale on Investment | 6,451,730 |  |  |  |  |  | 1,500,052 | 47,645 |  |  | 5,678,560 |  |  |  |  |  |  |  |  |
Gross Unrealized Gains | 46,758 | 77 | 479 | 136 | 70 | 4 | 44,050 | 151 | 1,791 |  | 728,286 | 187,191 | 87,535 | 2,765 | 872 | 3,240 | 379,935 | 1,015 | 65,733 |
Short-term | 7 |  |  |  |  |  |  |  |  |  | 439 |  |  |  |  |  |  |  |  |
Investment other than available for sale securities pledged as collateral gross unrealized gain | 46,765 |  |  |  |  |  |  |  |  |  | 728,725 |  |  |  |  |  |  |  |  |
Gross unrealized gains on securities pledged as collateral | 1 |  |  |  | 1 |  |  |  |  |  | 262 |  |  |  | 262 |  |  |  |  |
Gross Unrealized Gains On available-for-sale Investment | 46,766 |  |  |  |  |  |  |  |  |  | 728,987 |  |  |  |  |  |  |  |  |
Gross Unrealized Losses | 137,699 | 59,103 | 26,437 | 4,092 | 745 | 148 | 23,426 | 178 | 23,570 |  | 77,715 | 383 | 9,117 |  | 626 |  | 20,555 | 528 | 46,506 |
Other short-term investments gross unrealized losses | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment other than available for sale securities pledged as collateral gross unrealized losses | 137,703 |  |  |  |  |  |  |  |  |  | 77,715 |  |  |  |  |  |  |  |  |
Gross unrealized losses on securities pledged as collateral | 46 |  |  |  | 46 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Unrealized Loss On available-for-sale Investment | 137,749 |  |  |  |  |  |  |  |  |  | 77,715 |  |  |  |  |  |  |  |  |
Estimated Fair Value | 5,585,275 | 1,637,190 | 982,587 | 105,191 | 250,838 | 53,246 | 1,520,676 | 47,618 | 987,929 |  | 5,402,395 | 1,848,932 | 1,077,972 | 70,112 | 127,283 | 82,535 | 1,455,582 | 33,342 | 706,637 |
Short-term Investments | 611,177 |  |  |  |  |  |  |  |  |  | 661,658 |  |  |  |  |  |  |  |  |
Non - credit other - than - temporary Impairments | 8 |  |  |  |  |  | 8 |  |  |  | 6,892 |  |  |  |  |  | 6,892 |  |  |
Investment other than available for sale securities pledged as collateral | 6,196,452 |  |  |  |  |  |  |  |  |  | 6,064,053 |  |  |  |  |  |  |  |  |
Non-credit other-than-temporary Impairments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non - credit other - than - temporary Impairments | 8 |  |  |  |  |  | 8 |  |  |  | 6,892 |  |  |  |  |  | 6,892 |  |  |
Fair value of securities pledged as collateral | 164,295 |  |  |  | 164,295 |  |  |  |  |  | 265,779 |  |  |  | 265,779 |  |  |  |  |
Non - credit other - than - temporary Impairments | 8 |  |  |  |  |  | 8 |  |  |  | 6,892 |  |  |  |  |  | 6,892 |  |  |
Total available-for-sale investments | 6,360,747 |  |  |  |  |  | 1,520,676 | 47,618 |  |  | 6,329,832 |  |  |  |  |  |  |  |  |
Non - credit other - than - temporary Impairments | $ 8 |  |  |  |  |  | $ 8 |  |  |  | $ 6,892 |  |  |  |  |  | $ 6,892 |  |  |

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