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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total fixed-maturity securities, Amortized Cost | $ 82,409 | $ 99,088 |
Total fixed-maturity securities, Gross Unrealized Gains | 60 | 78 |
Total fixed-maturity securities, Gross Unrealized Losses | (10) | (111) |
Total fixed-maturity securities, Estimated Fair Value | 82,459 | 99,055 |
Unrestricted Fixed-Maturity Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total fixed-maturity securities, Amortized Cost | 52,959 | 66,481 |
Total fixed-maturity securities, Gross Unrealized Gains | 7 | 14 |
Total fixed-maturity securities, Gross Unrealized Losses | (2) | (11) |
Total fixed-maturity securities, Estimated Fair Value | 52,964 | 66,484 | [1]
Fixed-Maturity Securities Held in Trust [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total fixed-maturity securities, Amortized Cost | 29,450 | 32,607 |
Total fixed-maturity securities, Gross Unrealized Gains | 53 | 64 |
Total fixed-maturity securities, Gross Unrealized Losses | (8) | (100) |
Total fixed-maturity securities, Estimated Fair Value | 29,495 | 32,571 | [1]
U.S. Government Treasury Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total fixed-maturity securities, Amortized Cost | 249 | 249 |
Total fixed-maturity securities, Gross Unrealized Gains | 1 |  |
Total fixed-maturity securities, Gross Unrealized Losses |  | (1) |
Total fixed-maturity securities, Estimated Fair Value | 250 | 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 | 61,435 | 69,392 |
Total fixed-maturity securities, Gross Unrealized Gains | 8 | 13 |
Total fixed-maturity securities, Gross Unrealized Losses | (2) | (23) |
Total fixed-maturity securities, Estimated Fair Value | 61,441 | 69,382 |
Corporate Debt Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total fixed-maturity securities, Amortized Cost | 12,907 | 21,048 |
Total fixed-maturity securities, Gross Unrealized Gains | 44 | 62 |
Total fixed-maturity securities, Gross Unrealized Losses | (3) | (49) |
Total fixed-maturity securities, Estimated Fair Value | 12,948 | 21,061 |
Foreign Corporate Debt Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total fixed-maturity securities, Amortized Cost | 7,818 | 8,399 |
Total fixed-maturity securities, Gross Unrealized Gains | 7 | 3 |
Total fixed-maturity securities, Gross Unrealized Losses | (5) | (38) |
Total fixed-maturity securities, Estimated Fair Value | $ 7,820 | $ 8,364 |
[1] | Balances derived from audited financial statements as of December 31, 2015.

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