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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 | Jun. 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 | $ 270,486 | $ 272,895
Total fixed-maturity securities, Gross Unrealized Gains | 2,697 | 4,869
Total fixed-maturity securities, Gross Unrealized Losses | (2,579) | (295)
Total fixed-maturity securities, Estimated Fair Value | 270,604 | 281,547
Total fixed-maturity securities held in trust, Amortized Cost | 177,371 | 197,236
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 2,443 | 4,701
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (2,407) | (277)
Total fixed-maturity securities held in trust, Estimated Fair Value | 177,407 | 201,660
Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 20,405 | 14,246
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains | 254 | 168
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses | (172) | (18)
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 20,487 | 14,396
Held to Maturity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 72,710 | 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 | 72,710 | 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 | 72,849 | 97,104
Total fixed-maturity securities, Gross Unrealized Gains | 562 | 1,415
Total fixed-maturity securities, Gross Unrealized Losses | (1,661) | (156)
Total fixed-maturity securities, Estimated Fair Value | 71,750 | 98,363
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 102,209 | 91,997
Total fixed-maturity securities, Gross Unrealized Gains | 1,955 | 3,011
Total fixed-maturity securities, Gross Unrealized Losses | (557) | (34)
Total fixed-maturity securities, Estimated Fair Value | 103,607 | 94,974
Commercial Paper [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 62,989 | 54,948
Total fixed-maturity securities, Gross Unrealized Gains | 1 |
Total fixed-maturity securities, Gross Unrealized Losses |  |
Total fixed-maturity securities, Estimated Fair Value | 62,990 | 54,948
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 28,970 | 18,305
Total fixed-maturity securities, Gross Unrealized Gains | 174 | 379
Total fixed-maturity securities, Gross Unrealized Losses | (228) | (18)
Total fixed-maturity securities, Estimated Fair Value | 28,856 | 18,666
Commercial Mortgage-Backed Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 3,469 | 10,541
Total fixed-maturity securities, Gross Unrealized Gains | 5 | 64
Total fixed-maturity securities, Gross Unrealized Losses | (73) | (87)
Total fixed-maturity securities, Estimated Fair Value | $ 3,401 | $ 10,518

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