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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
Sep. 30, 2012
Dec. 31, 2011
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 4,887,684 $ 5,346,897
Other investments amortized cost basis 100 100
Investment other than available for sale securities pledged as collateral amortized cost basis 5,600,921 6,130,012
Amortized cost basis of securities pledged as collateral 285,284 261,958
Amortized Cost on Investment 5,886,205 6,391,970
Gross Unrealized Gains 648,340 627,588
Other 100 100
Investment other than available for sale securities pledged as collateral gross unrealized gain 648,670 627,645
Amortized cost basis of securities pledged as collateral 581 1,696
Gross Unrealized Gains On Investment 649,251 629,341
Gross Unrealized Losses 95,334 144,196
Other Investment, Gross Unrealized Losses      
Investment other than available for sale securities pledged as collateral gross unrealized losses 95,334 144,197
Gross unrealized loss on securities pledged as collateral 5 124
Gross Unrealized Loss On Investment 95,339 144,321
Estimated Fair Value 5,440,690 5,830,289
Other Short-term Investments 713,467 783,071
Other Investments 100 100
Investment other than available for sale securities pledged as collateral 6,154,257 6,613,460
Fair value of securities pledged as collateral 285,860 263,530
Estimated fair value on investments 6,440,117 6,876,990
Non - credit other - than - temporary Impairments 9,463 20,907
Short-term Investments [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Other short-term investments amortized cost basis 713,137 783,015
Short-term 330 57
Other short-term investments gross unrealized losses   1
Other Short-term Investments 713,467 783,071
Municipal Obligations [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,680,404 1,858,493
Gross Unrealized Gains 181,472 144,989
Gross Unrealized Losses 102 483
Estimated Fair Value 1,861,774 2,002,999
Corporate Obligations [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,039,248 1,087,629
Gross Unrealized Gains 92,706 63,074
Gross Unrealized Losses 9,870 23,203
Estimated Fair Value 1,122,084 1,127,500
Foreign Obligations [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 66,947 89,951
Gross Unrealized Gains 3,448 4,844
Estimated Fair Value 70,395 94,795
US Government Obligations [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 110,945 107,717
Amortized cost basis of securities pledged as collateral 285,284 259,401
Gross Unrealized Gains 1,071 3,847
Amortized cost basis of securities pledged as collateral 581 1,525
Gross Unrealized Losses 430 2
Gross unrealized loss on securities pledged as collateral 5 124
Estimated Fair Value 111,586 111,562
Fair value of securities pledged as collateral 285,860 260,802
U.S. Agency Obligations [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 79,999 80,960
Gross Unrealized Gains 4,024 5,911
Estimated Fair Value 84,023 86,871
Residential Mortgage-backed securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 1,144,258 1,119,517
Amortized cost basis of securities pledged as collateral   2,557
Gross Unrealized Gains 301,074 350,816
Amortized cost basis of securities pledged as collateral   171
Gross Unrealized Losses 36,306 57,816
Estimated Fair Value 1,409,026 1,412,517
Fair value of securities pledged as collateral   2,728
Non - credit other - than - temporary Impairments 9,463 20,907
Collateralized debt obligations [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 36,814 48,686
Gross Unrealized Gains 873 142
Gross Unrealized Losses 878 2,591
Estimated Fair Value 36,809 46,237
Other Asset-backed Securities [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 729,069 953,944
Gross Unrealized Gains 63,672 53,965
Gross Unrealized Losses 47,748 60,101
Estimated Fair Value $ 744,993 $ 947,808