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Investment Securities - Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Estimated Fair Values of Fixed-Maturity Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost $ 270,486 $ 272,895
Total fixed-maturity securities, Gross Unrealized Gains 2,697 4,869
Total fixed-maturity securities, Gross Unrealized Losses (2,579) (295)
Total fixed-maturity securities, Estimated Fair Value 270,604 281,547
Total fixed-maturity securities held in trust, Amortized Cost 177,371 197,236
Total fixed-maturity securities held in trust, Gross Unrealized Gains 2,443 4,701
Total fixed-maturity securities held in trust, Gross Unrealized Losses (2,407) (277)
Total fixed-maturity securities held in trust, Estimated Fair Value 177,407 201,660
Trading [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less total unrestricted fixed-maturity securities, Amortized Cost 20,405 14,246
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains 254 168
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses (172) (18)
Less total unrestricted fixed-maturity securities, Estimated Fair Value 20,487 14,396
Held to Maturity [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less total unrestricted fixed-maturity securities, Amortized Cost 72,710 61,413
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains      
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses      
Less total unrestricted fixed-maturity securities, Estimated Fair Value 72,710 61,413
Obligations of U.S. Government Sponsored Enterprises [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 72,849 97,104
Total fixed-maturity securities, Gross Unrealized Gains 562 1,415
Total fixed-maturity securities, Gross Unrealized Losses (1,661) (156)
Total fixed-maturity securities, Estimated Fair Value 71,750 98,363
Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 102,209 91,997
Total fixed-maturity securities, Gross Unrealized Gains 1,955 3,011
Total fixed-maturity securities, Gross Unrealized Losses (557) (34)
Total fixed-maturity securities, Estimated Fair Value 103,607 94,974
Commercial Paper [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 62,989 54,948
Total fixed-maturity securities, Gross Unrealized Gains 1   
Total fixed-maturity securities, Gross Unrealized Losses      
Total fixed-maturity securities, Estimated Fair Value 62,990 54,948
Foreign Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 28,970 18,305
Total fixed-maturity securities, Gross Unrealized Gains 174 379
Total fixed-maturity securities, Gross Unrealized Losses (228) (18)
Total fixed-maturity securities, Estimated Fair Value 28,856 18,666
Commercial Mortgage-Backed Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 3,469 10,541
Total fixed-maturity securities, Gross Unrealized Gains 5 64
Total fixed-maturity securities, Gross Unrealized Losses (73) (87)
Total fixed-maturity securities, Estimated Fair Value $ 3,401 $ 10,518