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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, 2014
Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost $ 146,194 $ 217,587
Total fixed-maturity securities, Gross Unrealized Gains 943 1,730
Total fixed-maturity securities, Gross Unrealized Losses (97) (516)
Total fixed-maturity securities, Estimated Fair Value 147,040 218,801
Total fixed-maturity securities held in trust, Amortized Cost 59,888 144,909
Total fixed-maturity securities held in trust, Gross Unrealized Gains 691 1,498
Total fixed-maturity securities held in trust, Gross Unrealized Losses (83) (503)
Total fixed-maturity securities held in trust, Estimated Fair Value 60,496 145,904
Commercial Paper [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost 51,481 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 51,481 98,932
Held to Maturity [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less total unrestricted fixed-maturity securities, Amortized Cost 77,825 65,352
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains 0 0
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses 0 0
Less total unrestricted fixed-maturity securities, Estimated Fair Value 77,825 65,352
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 36 127
Total fixed-maturity securities, Gross Unrealized Losses (20) (163)
Total fixed-maturity securities, Estimated Fair Value 8,507 15,832
Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost 67,432 80,624
Total fixed-maturity securities, Gross Unrealized Gains 829 1,450
Total fixed-maturity securities, Gross Unrealized Losses (60) (182)
Total fixed-maturity securities, Estimated Fair Value 68,201 81,892
Foreign Corporate Debt Securities [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Total fixed-maturity securities, Amortized Cost 18,790 22,166
Total fixed-maturity securities, Gross Unrealized Gains 78 149
Total fixed-maturity securities, Gross Unrealized Losses (17) (170)
Total fixed-maturity securities, Estimated Fair Value 18,851 22,145
Trading [Member]
    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Less total unrestricted fixed-maturity securities, Amortized Cost 8,481 7,326
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains 252 232
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses (14) (13)
Less total unrestricted fixed-maturity securities, Estimated Fair Value $ 8,719 $ 7,545