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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, 2012 | Dec. 31, 2011
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | $ 272,895 | $ 298,978
Total fixed-maturity securities, Gross Unrealized Gains | 4,869 | 6,442
Total fixed-maturity securities, Gross Unrealized Losses | (295) | (1,375)
Total fixed-maturity securities, Estimated Fair Value | 277,469 | 304,045
Less total unrestricted fixed-maturity securities, Amortized Cost | 75,659 | 5,348
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains | 168 | 151
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses | (18) | (9)
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 75,809 | 5,490
Total fixed-maturity securities held in trust, Amortized Cost | 197,236 |
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 4,701 |
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (277) |
Total fixed-maturity securities held in trust, Estimated Fair Value | 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 | 97,103 | 122,874
Total fixed-maturity securities, Gross Unrealized Gains | 1,416 | 2,029
Total fixed-maturity securities, Gross Unrealized Losses | (156) | (267)
Total fixed-maturity securities, Estimated Fair Value | 98,363 | 124,636
Corporate debt securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 91,997 | 129,916
Total fixed-maturity securities, Gross Unrealized Gains | 3,010 | 3,791
Total fixed-maturity securities, Gross Unrealized Losses | (34) | (845)
Total fixed-maturity securities, Estimated Fair Value | 94,973 | 132,862
Commercial paper [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 54,949 |
Total fixed-maturity securities, Estimated Fair Value | 54,949 |
Foreign corporate debt securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 18,305 | 26,800
Total fixed-maturity securities, Gross Unrealized Gains | 379 | 546
Total fixed-maturity securities, Gross Unrealized Losses | (18) | (117)
Total fixed-maturity securities, Estimated Fair Value | 18,666 | 27,229
Commercial Mortgage-backed securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 10,541 | 19,138
Total fixed-maturity securities, Gross Unrealized Gains | 64 | 76
Total fixed-maturity securities, Gross Unrealized Losses | (87) | (146)
Total fixed-maturity securities, Estimated Fair Value | 10,518 | 19,068
U.S. Treasury securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost |  | 250
Total fixed-maturity securities, Estimated Fair Value |  | $ 250

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