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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, 2014 | Dec. 31, 2013
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | $ 136,454 | $ 217,587
Total fixed-maturity securities, Gross Unrealized Gains | 734 | 1,730
Total fixed-maturity securities, Gross Unrealized Losses | (172) | (516)
Total fixed-maturity securities, Estimated Fair Value | 137,016 | 218,801
Total fixed-maturity securities held in trust, Amortized Cost | 55,337 | 144,909
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 527 | 1,498
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (154) | (503)
Total fixed-maturity securities held in trust, Estimated Fair Value | 55,710 | 145,904
Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 7,944 | 7,326
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains | 207 | 232
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses | (18) | (13)
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 8,133 | 7,545
Held to Maturity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 73,173 | 65,352
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 73,173 | 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 | 6,491 | 15,868
Total fixed-maturity securities, Gross Unrealized Gains | 23 | 127
Total fixed-maturity securities, Gross Unrealized Losses | (34) | (163)
Total fixed-maturity securities, Estimated Fair Value | 6,480 | 15,832
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 62,232 | 80,624
Total fixed-maturity securities, Gross Unrealized Gains | 665 | 1,450
Total fixed-maturity securities, Gross Unrealized Losses | (94) | (182)
Total fixed-maturity securities, Estimated Fair Value | 62,803 | 81,892
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 12,734 | 22,166
Total fixed-maturity securities, Gross Unrealized Gains | 46 | 149
Total fixed-maturity securities, Gross Unrealized Losses | (44) | (170)
Total fixed-maturity securities, Estimated Fair Value | 12,736 | 22,145
Commercial Paper [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 54,997 | 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 | $ 54,997 | $ 98,932

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