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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 | Dec. 31, 2013 Successor Ambac [Member] | Dec. 31, 2013 Successor Ambac [Member] Corporate Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Residential Mortgage-Backed Securities [Member] | Dec. 31, 2013 Successor Ambac [Member] Collateralized Debt Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Short-Term [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] Securities Pledged as Collateral [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] Municipal Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] Corporate Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] Foreign Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] U.S. Government Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] U.S. Government Obligations [Member] Securities Pledged as Collateral [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] U.S. Agency Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] Residential Mortgage-Backed Securities [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] Collateralized Debt Obligations [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Securities [Member] Asset-backed Securities [Member] | Dec. 31, 2013 Successor Ambac [Member] Fixed Income Investments And Other Investments [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Corporate Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Short-Term [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] Securities Pledged as Collateral [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] Municipal Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] Corporate Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] Foreign Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] U.S. Government Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] U.S. Government Obligations [Member] Securities Pledged as Collateral [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] U.S. Agency Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] Residential Mortgage-Backed Securities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] Collateralized Debt Obligations [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Securities [Member] Asset-backed Securities [Member] | Dec. 31, 2012 Predecessor Ambac [Member] Fixed Income Investments And Other Investments [Member]
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost | $ 6,324,568 |  | $ 1,516,877 | $ 184,118 | $ 271,118 | $ 5,927,254 | $ 126,196 | $ 1,405,293 | $ 1,508,377 | $ 131,709 | $ 128,415 | $ 126,196 | $ 32,214 | $ 1,516,877 | $ 184,118 | $ 1,020,251 | $ 6,198,372 | $ 5,678,560 |  | $ 661,219 | $ 4,751,824 | $ 265,517 | $ 1,662,124 | $ 999,554 | $ 67,347 | $ 127,037 | $ 265,517 | $ 79,295 | $ 1,096,202 | $ 32,855 | $ 687,410 | $ 5,413,043
Gross Unrealized Gains | 74,724 |  |  |  | 1 | 74,696 | 27 | 857 | 4,886 | 69 | 9 | 27 | 10 | 59,853 | 217 | 8,795 | 74,697 | 728,987 |  | 439 | 728,286 | 262 | 187,191 | 87,535 | 2,765 | 872 | 262 | 3,240 | 379,935 | 1,015 | 65,733 | 728,725
Gross Unrealized Losses | 116,634 |  |  |  |  | 116,634 |  | 28,427 | 23,894 | 6,901 | 2,176 |  | 70 | 18,105 | 463 | 36,598 | 116,634 | 77,715 |  |  | 77,715 |  | 383 | 9,117 |  | 626 |  |  | 20,555 | 528 | 46,506 | 77,715
Estimated Fair Value | 6,282,658 | 2,475,182 | 1,558,625 | 183,872 | 271,119 | 5,885,316 | 126,223 | 1,377,723 | 1,489,369 | 124,877 | 126,248 | 126,223 | 32,154 | 1,558,625 | 183,872 | 992,448 | 6,156,435 | 6,329,832 | 2,261,294 | 661,658 | 5,402,395 | 265,779 | 1,848,932 | 1,077,972 | 70,112 | 127,283 | 265,779 | 82,535 | 1,455,582 | 33,342 | 706,637 | 6,064,053
Non-credit other-than-temporary Impairments | $ 852 |  |  |  |  | $ 852 |  |  |  |  |  |  |  | $ 852 |  |  | $ 852 | $ 6,892 |  |  | $ 6,892 |  |  |  |  |  |  |  | $ 6,892 |  |  | $ 6,892

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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