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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
Sep. 30, 2013
Dec. 31, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost $ 249,616 $ 272,895
Total fixed-maturity securities, Gross Unrealized Gains 2,451 4,869
Total fixed-maturity securities, Gross Unrealized Losses (1,767) (295)
Total fixed-maturity securities, Estimated Fair Value 250,300 277,469
Total fixed-maturity securities held in trust, Amortized Cost 171,733 197,236
Total fixed-maturity securities held in trust, Gross Unrealized Gains 2,221 4,701
Total fixed-maturity securities held in trust, Gross Unrealized Losses (1,582) (277)
Total fixed-maturity securities held in trust, Estimated Fair Value 172,372 201,660
Trading [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less total unrestricted fixed-maturity securities, Amortized Cost 10,354 14,246
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains 230 168
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses (185) (18)
Less total unrestricted fixed-maturity securities, Estimated Fair Value 10,399 14,396
Held to Maturity [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less total unrestricted fixed-maturity securities, Amortized Cost 67,529 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 67,529 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 58,262 97,103
Total fixed-maturity securities, Gross Unrealized Gains 419 1,416
Total fixed-maturity securities, Gross Unrealized Losses (1,088) (156)
Total fixed-maturity securities, Estimated Fair Value 57,593 98,363
Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 102,143 91,997
Total fixed-maturity securities, Gross Unrealized Gains 1,832 3,010
Total fixed-maturity securities, Gross Unrealized Losses (413) (34)
Total fixed-maturity securities, Estimated Fair Value 103,562 94,973
Commercial Paper [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 59,978 54,949
Total fixed-maturity securities, Gross Unrealized Gains     
Total fixed-maturity securities, Gross Unrealized Losses     
Total fixed-maturity securities, Estimated Fair Value 59,978 54,949
Foreign Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 26,848 18,305
Total fixed-maturity securities, Gross Unrealized Gains 200 379
Total fixed-maturity securities, Gross Unrealized Losses (213) (18)
Total fixed-maturity securities, Estimated Fair Value 26,835 18,666
Commercial Mortgage-Backed Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed- maturity securities, Amortized Cost 2,385 10,541
Total fixed-maturity securities, Gross Unrealized Gains   64
Total fixed-maturity securities, Gross Unrealized Losses (53) (87)
Total fixed-maturity securities, Estimated Fair Value $ 2,332 $ 10,518