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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
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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

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