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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
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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

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