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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments (Detail) (Successor Ambac [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 6,462,103 | $ 6,324,568
Gross Unrealized Gains | 130,258 | 74,724
Gross Unrealized Losses | 83,446 | 116,634
Estimated Fair Value | 6,508,915 | 6,282,658
Non - credit other - than - temporary Impairments | 834 | 852
Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value | 2,546,762 | 2,475,182
Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,578,205 |
Estimated Fair Value | 1,655,658 |
Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 177,780 |
Estimated Fair Value | 177,339 |
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,237,667 |
Estimated Fair Value | 1,221,993 |
Short-Term [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 215,103 | 271,118
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 215,103 | 271,119
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,121,910 | 5,927,254
Gross Unrealized Gains | 130,225 | 74,696
Gross Unrealized Losses | 83,446 | 116,634
Estimated Fair Value | 6,168,689 | 5,885,316
Non - credit other - than - temporary Impairments | 834 | 852
Fixed Income Securities [Member] | Securities Pledged as Collateral [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,090 | 126,196
Gross Unrealized Gains | 33 | 27
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 125,123 | 126,223
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] | Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,189,334 | 1,405,293
Gross Unrealized Gains | 12,932 | 857
Gross Unrealized Losses | 16,978 | 28,427
Estimated Fair Value | 1,185,288 | 1,377,723
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] | Corporate Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,652,302 | 1,508,377
Gross Unrealized Gains | 9,535 | 4,886
Gross Unrealized Losses | 14,253 | 23,894
Estimated Fair Value | 1,647,584 | 1,489,369
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] | Foreign Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 146,189 | 131,709
Gross Unrealized Gains | 673 | 69
Gross Unrealized Losses | 4,818 | 6,901
Estimated Fair Value | 142,044 | 124,877
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] | U.S. Government Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 108,546 | 128,415
Gross Unrealized Gains | 75 | 9
Gross Unrealized Losses | 1,663 | 2,176
Estimated Fair Value | 106,958 | 126,248
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] | U.S. Government Obligations [Member] | Securities Pledged as Collateral [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 125,090 | 126,196
Gross Unrealized Gains | 33 | 27
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 125,123 | 126,223
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] | U.S. Agency Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 31,887 | 32,214
Gross Unrealized Gains | 3 | 10
Gross Unrealized Losses | 65 | 70
Estimated Fair Value | 31,825 | 32,154
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,578,205 | 1,516,877
Gross Unrealized Gains | 97,861 | 59,853
Gross Unrealized Losses | 20,408 | 18,105
Estimated Fair Value | 1,655,658 | 1,558,625
Non - credit other - than - temporary Impairments | 834 | 852
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 177,780 | 184,118
Gross Unrealized Gains | 202 | 217
Gross Unrealized Losses | 643 | 463
Estimated Fair Value | 177,339 | 183,872
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,237,667 | 1,020,251
Gross Unrealized Gains | 8,944 | 8,795
Gross Unrealized Losses | 24,618 | 36,598
Estimated Fair Value | 1,221,993 | 992,448
Non - credit other - than - temporary Impairments | 0 | 0
Fixed Income Investments And Other Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 6,337,013 | 6,198,372
Gross Unrealized Gains | 130,225 | 74,697
Gross Unrealized Losses | 83,446 | 116,634
Estimated Fair Value | 6,383,792 | 6,156,435
Non - credit other - than - temporary Impairments | $ 834 | $ 852

X
- 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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