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Investments - Summary of Amortized Cost and Estimated Fair Value of Investments, Excluding VIE Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 4,751,824 | $ 5,346,897
Other investments amortized cost basis | 100 | 100
Investment other than available for sale securities pledged as collateral amortized cost basis | 5,413,143 | 6,130,012
Amortized cost basis of securities pledged as collateral | 265,517 | 261,958
Amortized Cost on Investment | 5,678,660 | 6,391,970
Gross Unrealized Gains | 728,286 | 627,588
Other | 100 | 100
Investment other than available for sale securities pledged as collateral gross unrealized gain | 728,725 | 627,645
Amortized cost basis of securities pledged as collateral | 262 | 1,696
Gross Unrealized Gains On Investment | 728,987 | 629,341
Gross Unrealized Losses | 77,715 | 144,196
Other |  |
Other Investment, Gross Unrealized Gain Losses |  |
Investment other than available for sale securities pledged as collateral gross unrealized losses | 77,715 | 144,197
Gross unrealized loss on securities pledged as collateral |  | 124
Gross Unrealized Loss On Investment | 77,715 | 144,321
Estimated Fair Value | 5,402,395 | 5,830,289
Other Short-term Investments | 661,658 | 783,071
Other Investments | 100 | 100
Investment other than available for sale securities pledged as collateral | 6,064,153 | 6,613,460
Fair value of securities pledged as collateral | 265,779 | 263,530
Total investments | 6,329,932 | 6,876,990
Non - credit other - than - temporary Impairments | 6,892 | 20,907
Other |  |
Non - credit other - than - temporary Impairments | 6,892 | 20,907
Non - credit other - than - temporary Impairments | 6,892 | 20,907
Municipal obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,632,637 | 1,858,493
Gross Unrealized Gains | 182,476 | 144,989
Gross Unrealized Losses | 383 | 483
Estimated Fair Value | 1,814,730 | 2,002,999
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Corporate obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,029,041 | 1,087,629
Gross Unrealized Gains | 92,250 | 63,074
Gross Unrealized Losses | 9,117 | 23,203
Estimated Fair Value | 1,112,174 | 1,127,500
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Foreign obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 67,347 | 89,951
Gross Unrealized Gains | 2,765 | 4,844
Gross Unrealized Losses |  |
Estimated Fair Value | 70,112 | 94,795
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
U.S. government obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 127,037 | 107,717
Amortized cost basis of securities pledged as collateral | 265,517 | 259,401
Gross Unrealized Gains | 872 | 3,847
Amortized cost basis of securities pledged as collateral | 262 | 1,525
Gross Unrealized Losses | 626 | 2
Gross unrealized loss on securities pledged as collateral |  | 124
Estimated Fair Value | 127,283 | 111,562
Fair value of securities pledged as collateral | 265,779 | 260,802
Non - credit other - than - temporary Impairments |  |
Non-credit other-than-temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
U.S. agency obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 79,295 | 80,960
Gross Unrealized Gains | 3,240 | 5,911
Gross Unrealized Losses |  |
Estimated Fair Value | 82,535 | 86,871
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Residential mortgage-backed securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,096,202 | 1,119,517
Amortized cost basis of securities pledged as collateral |  | 2,557
Amortized Cost on Investment | 1,096,202 |
Gross Unrealized Gains | 379,935 | 350,816
Amortized cost basis of securities pledged as collateral |  | 171
Gross Unrealized Losses | 20,555 | 57,816
Gross unrealized loss on securities pledged as collateral |  |
Estimated Fair Value | 1,455,582 | 1,412,517
Fair value of securities pledged as collateral |  | 2,728
Total investments | 1,455,582 |
Non - credit other - than - temporary Impairments | 6,892 | 20,907
Non-credit other-than-temporary Impairments |  |
Non - credit other - than - temporary Impairments | 6,892 | 20,907
Non - credit other - than - temporary Impairments | 6,892 | 20,907
Collateralized debt obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 32,855 | 48,686
Amortized Cost on Investment | 32,855 |
Gross Unrealized Gains | 1,015 | 142
Gross Unrealized Losses | 528 | 2,591
Estimated Fair Value | 33,342 | 46,237
Total investments | 33,342 |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Asset-backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 687,410 | 953,944
Gross Unrealized Gains | 65,733 | 53,965
Gross Unrealized Losses | 46,506 | 60,101
Estimated Fair Value | 706,637 | 947,808
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Short-term [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Other short-term investments amortized cost basis | 661,219 | 783,015
Short-term | 439 | 57
Other short-term investments gross unrealized losses |  | 1
Gross Unrealized Loss On Investment |  | 1
Other Short-term Investments | 661,658 | 783,071
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Non - credit other - than - temporary Impairments |  |
Collateralized Investments [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Non-credit other-than-temporary Impairments |  |

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