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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 | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | $ 99,088 | $ 60,202
Total fixed-maturity securities, Gross Unrealized Gains | 78 | 590
Total fixed-maturity securities, Gross Unrealized Losses | (111) | (151)
Total fixed-maturity securities, Estimated Fair Value | 99,055 | 60,641
Unrestricted Fixed-Maturity Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 66,481 | 7,895
Total fixed-maturity securities, Gross Unrealized Gains | 14 | 179
Total fixed-maturity securities, Gross Unrealized Losses | (11) | (11)
Total fixed-maturity securities, Estimated Fair Value | 66,484 | 8,063
Fixed-Maturity Securities Held in Trust [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 32,607 | 52,307
Total fixed-maturity securities, Gross Unrealized Gains | 64 | 411
Total fixed-maturity securities, Gross Unrealized Losses | (100) | (140)
Total fixed-maturity securities, Estimated Fair Value | 32,571 | 52,578
U.S. Government Treasury Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 249 |
Total fixed-maturity securities, Gross Unrealized Losses | (1) |
Total fixed-maturity securities, Estimated Fair Value | 248 |
Obligations of U.S. Government Sponsored Enterprises [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 69,392 | 6,491
Total fixed-maturity securities, Gross Unrealized Gains | 13 | 12
Total fixed-maturity securities, Gross Unrealized Losses | (23) | (28)
Total fixed-maturity securities, Estimated Fair Value | 69,382 | 6,475
Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 21,048 | 41,018
Total fixed-maturity securities, Gross Unrealized Gains | 62 | 531
Total fixed-maturity securities, Gross Unrealized Losses | (49) | (65)
Total fixed-maturity securities, Estimated Fair Value | 21,061 | 41,484
Foreign Corporate Debt Securities [Member] |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Total fixed-maturity securities, Amortized Cost | 8,399 | 12,693
Total fixed-maturity securities, Gross Unrealized Gains | 3 | 47
Total fixed-maturity securities, Gross Unrealized Losses | (38) | (58)
Total fixed-maturity securities, Estimated Fair Value | $ 8,364 | $ 12,682

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