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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, 2012 | Dec. 31, 2011
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fixed maturity securities amortized cost | $ 275,845 | $ 298,978
Total fixed-maturity securities, Gross Unrealized Gains | 5,777 | 6,442
Total fixed-maturity securities, Gross Unrealized Losses | (328) | (1,375)
Total fixed-maturity securities, Estimated Fair Value | 281,294 | 304,045
Less total unrestricted fixed-maturity securities Amortized Cost | 72,690 | 5,348
Less total unrestricted fixed-maturity securities, Gross unrealized gains | 232 | 151
Less total unrestricted fixed-maturity securities, Gross unrealized losses | (140) | (9)
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 72,782 | 5,490
Total fixed-maturity securities held in trust, Amortized Cost | 203,155 | 293,630
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 5,545 | 6,291
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (188) | (1,366)
Total fixed-maturity securities held in trust, Estimated Fair Value | 208,512 | 298,555
US Treasury Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fixed maturity securities amortized cost | 250 | 250
Total fixed-maturity securities, Estimated Fair Value | 250 | 250
US Government-sponsored Enterprises Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fixed maturity securities amortized cost | 101,400 | 122,874
Total fixed-maturity securities, Gross Unrealized Gains | 1,608 | 2,029
Total fixed-maturity securities, Gross Unrealized Losses | (100) | (267)
Total fixed-maturity securities, Estimated Fair Value | 102,908 | 124,636
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fixed maturity securities amortized cost | 99,416 | 129,916
Total fixed-maturity securities, Gross Unrealized Gains | 3,611 | 3,791
Total fixed-maturity securities, Gross Unrealized Losses | (151) | (845)
Total fixed-maturity securities, Estimated Fair Value | 102,876 | 132,862
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fixed maturity securities amortized cost | 18,342 | 26,800
Total fixed-maturity securities, Gross Unrealized Gains | 447 | 546
Total fixed-maturity securities, Gross Unrealized Losses | (5) | (117)
Total fixed-maturity securities, Estimated Fair Value | 18,784 | 27,229
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fixed maturity securities amortized cost | 11,571 | 19,138
Total fixed-maturity securities, Gross Unrealized Gains | 55 | 76
Total fixed-maturity securities, Gross Unrealized Losses | (65) | (146)
Total fixed-maturity securities, Estimated Fair Value | 11,561 | 19,068
Commercial Paper [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Fixed maturity securities amortized cost | 44,866 |
Total fixed-maturity securities, Gross Unrealized Gains | 56 |
Total fixed-maturity securities, Gross Unrealized Losses | (7) |
Total fixed-maturity securities, Estimated Fair Value | $ 44,915 |

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