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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
Mar. 31, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost $ 215,199 $ 217,587
Total fixed-maturity securities, Gross Unrealized Gains 1,530 1,730
Total fixed-maturity securities, Gross Unrealized Losses (249) (516)
Total fixed-maturity securities, Estimated Fair Value 216,480 218,801
Total fixed-maturity securities held in trust, Amortized Cost 129,258 144,909
Total fixed-maturity securities held in trust, Gross Unrealized Gains 1,296 1,498
Total fixed-maturity securities held in trust, Gross Unrealized Losses (237) (503)
Total fixed-maturity securities held in trust, Estimated Fair Value 130,317 145,904
Obligations of U.S. Government Sponsored Enterprises [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost 8,491 15,868
Total fixed-maturity securities, Gross Unrealized Gains 46 127
Total fixed-maturity securities, Gross Unrealized Losses (40) (163)
Total fixed-maturity securities, Estimated Fair Value 8,497 15,832
Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost 89,529 80,624
Total fixed-maturity securities, Gross Unrealized Gains 1,306 1,450
Total fixed-maturity securities, Gross Unrealized Losses (104) (182)
Total fixed-maturity securities, Estimated Fair Value 90,731 81,892
Commercial Paper [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost 96,115 98,929
Total fixed-maturity securities, Gross Unrealized Gains   4
Total fixed-maturity securities, Gross Unrealized Losses   (1)
Total fixed-maturity securities, Estimated Fair Value 96,115 98,932
Foreign Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost 21,064 22,166
Total fixed-maturity securities, Gross Unrealized Gains 178 149
Total fixed-maturity securities, Gross Unrealized Losses (105) (170)
Total fixed-maturity securities, Estimated Fair Value 21,137 22,145
Trading [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less total unrestricted fixed-maturity securities, Amortized Cost 7,303 7,326
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains 234 232
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses (12) (13)
Less total unrestricted fixed-maturity securities, Estimated Fair Value 7,525 7,545
Held to Maturity [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less total unrestricted fixed-maturity securities, Amortized Cost 78,638 65,352
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 $ 78,638 $ 65,352