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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 | Jun. 30, 2015 | Dec. 31, 2014
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | $ 107,188 | $ 60,202
Total fixed-maturity securities, Gross Unrealized Gains | 212 | 590
Total fixed-maturity securities, Gross Unrealized Losses | (56) | (151)
Total fixed-maturity securities, Estimated Fair Value | 107,344 | 60,641
Less total unrestricted fixed-maturity securities, Amortized Cost | 68,046 | 7,895
Less total unrestricted fixed-maturity securities, Gross Unrealized Gains | 60 | 179
Less total unrestricted fixed-maturity securities, Gross Unrealized Losses | (3) | (11)
Less total unrestricted fixed-maturity securities, Estimated Fair Value | 68,103 | 8,063
Total fixed-maturity securities held in trust, Amortized Cost | 39,142 | 52,307
Total fixed-maturity securities held in trust, Gross Unrealized Gains | 152 | 411
Total fixed-maturity securities held in trust, Gross Unrealized Losses | (53) | (140)
Total fixed-maturity securities held in trust, Estimated Fair Value | 39,241 | 52,578
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 70,483 | 6,491
Total fixed-maturity securities, Gross Unrealized Gains | 9 | 12
Total fixed-maturity securities, Gross Unrealized Losses | (9) | (28)
Total fixed-maturity securities, Estimated Fair Value | 70,483 | 6,475
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 25,564 | 41,018
Total fixed-maturity securities, Gross Unrealized Gains | 171 | 531
Total fixed-maturity securities, Gross Unrealized Losses | (35) | (65)
Total fixed-maturity securities, Estimated Fair Value | 25,700 | 41,484
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 11,141 | 12,693
Total fixed-maturity securities, Gross Unrealized Gains | 32 | 47
Total fixed-maturity securities, Gross Unrealized Losses | (12) | (58)
Total fixed-maturity securities, Estimated Fair Value | $ 11,161 | $ 12,682

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