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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 | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | $ 217,587 | $ 272,895
Total fixed-maturity securities, Gross Unrealized Gains | 1,730 | 4,869
Total fixed-maturity securities, Gross Unrealized Losses | (516) | (295)
Total fixed-maturity securities, Estimated Fair Value | 218,801 | 277,469
Total fixed-maturity securities held in trust, Amortized Cost | 144,909 | 197,236
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 1,498 | 4,701
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (503) | (277)
Total fixed-maturity securities held in trust, Estimated Fair Value | 145,904 | 201,660
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 15,868 | 97,103
Total fixed-maturity securities, Gross Unrealized Gains | 127 | 1,416
Total fixed-maturity securities, Gross Unrealized Losses | (163) | (156)
Total fixed-maturity securities, Estimated Fair Value | 15,832 | 98,363
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 80,624 | 91,997
Total fixed-maturity securities, Gross Unrealized Gains | 1,450 | 3,010
Total fixed-maturity securities, Gross Unrealized Losses | (182) | (34)
Total fixed-maturity securities, Estimated Fair Value | 81,892 | 94,973
Commercial Paper [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 98,929 | 54,949
Total fixed-maturity securities, Gross Unrealized Gains | 4 |
Total fixed-maturity securities, Gross Unrealized Losses | (1) |
Total fixed-maturity securities, Estimated Fair Value | 98,932 | 54,949
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 22,166 | 18,305
Total fixed-maturity securities, Gross Unrealized Gains | 149 | 379
Total fixed-maturity securities, Gross Unrealized Losses | (170) | (18)
Total fixed-maturity securities, Estimated Fair Value | 22,145 | 18,666
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost |  | 10,541
Total fixed-maturity securities, Gross Unrealized Gains |  | 64
Total fixed-maturity securities, Gross Unrealized Losses |  | (87)
Total fixed-maturity securities, Estimated Fair Value |  | 10,518
Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 7,326 | 14,246
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains | 232 | 168
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses | (13) | (18)
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 7,545 | 14,396
Held to Maturity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 65,352 | 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 | $ 65,352 | $ 61,413

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