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Amortized Cost/Cost and Estimated Fair Value of Investments in Fixed Maturity and Equity Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost $ 1,756,299 $ 1,688,276
Gross Unrealized Losses/ OTTI (5,372) [1] (19,940) [1]
Fixed maturity available-for-sale securities, at estimated fair value 1,971,981 1,842,081
Equity available-for-sale securities, cost 38,761 36,145
Equity available-for-sale securities, at estimated fair value 40,189 31,040
Banking securities
   
Schedule of Available-for-sale Securities [Line Items]    
Equity available-for-sale securities, cost 32,820 30,189
Equity available-for-sale securities, at estimated fair value 33,377 24,993
Other financial services securities
   
Schedule of Available-for-sale Securities [Line Items]    
Equity available-for-sale securities, cost 150 165
Equity available-for-sale securities, at estimated fair value 468 394
Industrial securities
   
Schedule of Available-for-sale Securities [Line Items]    
Equity available-for-sale securities, cost 5,791 5,791
Equity available-for-sale securities, at estimated fair value 6,344 5,653
Corporate securities
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 1,143,790 1,068,904
Fixed maturity available-for-sale securities, at estimated fair value 1,281,875 1,164,173
Asset-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 98,888 107,373
Fixed maturity available-for-sale securities, at estimated fair value 101,915 106,148
Commercial mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 99,958 109,318
Fixed maturity available-for-sale securities, at estimated fair value 112,250 119,050
Residential mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 96,864 83,576
Fixed maturity available-for-sale securities, at estimated fair value 102,111 84,219
Municipals
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 1,077 1,124
Fixed maturity available-for-sale securities, at estimated fair value 1,188 1,210
Government and government agencies | United States
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 306,881 309,063
Fixed maturity available-for-sale securities, at estimated fair value 361,649 356,960
Government and government agencies | Foreign
   
Schedule of Available-for-sale Securities [Line Items]    
Fixed maturity available-for-sale securities, amortized cost 8,841 8,918
Fixed maturity available-for-sale securities, at estimated fair value 10,993 10,321
Equity securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 2,695 229
Gross Unrealized Losses/ OTTI (1,267) [2] (5,334) [2]
Equity securities | Banking securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 1,824  
Gross Unrealized Losses/ OTTI (1,267) [2] (5,196) [2]
Equity securities | Other financial services securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 318 229
Equity securities | Industrial securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 553  
Gross Unrealized Losses/ OTTI   (138) [2]
Fixed maturity AFS securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 219,787 168,411
Gross Unrealized Losses/ OTTI (4,105) [2] (14,606) [2]
Fixed maturity AFS securities | Corporate securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 139,905 99,060
Gross Unrealized Losses/ OTTI (1,820) [2] (3,791) [2]
Fixed maturity AFS securities | Asset-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 5,082 5,944
Gross Unrealized Losses/ OTTI (2,055) [2] (7,169) [2]
Fixed maturity AFS securities | Commercial mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 12,292 9,913
Gross Unrealized Losses/ OTTI   (181) [2]
Fixed maturity AFS securities | Residential mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 5,477 4,108
Gross Unrealized Losses/ OTTI (230) [2] (3,465) [2]
Fixed maturity AFS securities | Municipals
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 111 86
Fixed maturity AFS securities | Government and government agencies | United States
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains 54,768 47,897
Fixed maturity AFS securities | Government and government agencies | Foreign
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Gains $ 2,152 $ 1,403
[1] Subsequent unrealized gains (losses) on OTTI securities are included in OCI-OTTI.
[2] Subsequent unrealized gains (losses) on other-than-temporary impairments ("OTTI") securities are included in OCI-OTTI.