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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 | Mar. 31, 2013 | Dec. 31, 2012
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | $ 277,654 | $ 272,895
Total fixed-maturity securities, Gross Unrealized Gains | 4,252 | 4,869
Total fixed-maturity securities, Gross Unrealized Losses | (359) | (295)
Total fixed-maturity securities, Estimated Fair Value | 281,547 | 277,469
Total fixed-maturity securities held in trust, Amortized Cost | 194,196 | 197,236
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 4,078 | 4,701
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (326) | (277)
Total fixed-maturity securities held in trust, Estimated Fair Value | 197,948 | 201,660
Trading [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 10,002 | 14,246
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains | 174 | 168
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses | (33) | (18)
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 10,143 | 14,396
Held to maturity [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Less total unrestricted fixed-maturity securities, Amortized Cost | 73,456 | 61,413
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 73,456 | 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 | 73,055 | 97,104
Total fixed-maturity securities, Gross Unrealized Gains | 1,040 | 1,415
Total fixed-maturity securities, Gross Unrealized Losses | (199) | (156)
Total fixed-maturity securities, Estimated Fair Value | 73,896 | 98,363
Corporate debt securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 105,320 | 91,997
Total fixed-maturity securities, Gross Unrealized Gains | 2,853 | 3,011
Total fixed-maturity securities, Gross Unrealized Losses | (59) | (34)
Total fixed-maturity securities, Estimated Fair Value | 108,114 | 94,974
Commercial paper [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 69,607 | 54,948
Total fixed-maturity securities, Estimated Fair Value | 69,607 | 54,948
Foreign corporate debt securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 20,779 | 18,305
Total fixed-maturity securities, Gross Unrealized Gains | 326 | 379
Total fixed-maturity securities, Gross Unrealized Losses | (23) | (18)
Total fixed-maturity securities, Estimated Fair Value | 21,082 | 18,666
Commercial Mortgage-backed securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed- maturity securities, Amortized Cost | 8,893 | 10,541
Total fixed-maturity securities, Gross Unrealized Gains | 33 | 64
Total fixed-maturity securities, Gross Unrealized Losses | (78) | (87)
Total fixed-maturity securities, Estimated Fair Value | $ 8,848 | $ 10,518

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