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Investments - Summary of Amortized Cost and Fair Value of Investments in Fixed Maturity Securities, Classified as Available-for-Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Investment [Line Items] |  |
Within one year, Amortized Cost | $ 68,592 |
After one year through five years, Amortized Cost | 159,000 |
After five years through ten years, Amortized Cost | 47,350 |
After ten years, Amortized Cost | 177,336 |
Totals, Amortized Cost | 464,740 | $ 479,772
Within one year, Fair Value | 68,518 |
After one year through five years, Fair Value | 159,135 |
After five years through ten years, Fair Value | 48,152 |
After ten years, Fair Value | 183,167 |
Total, Fair Value | 471,254 | 478,730
U.S. Agency-Based Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Available-for-sale securities, Amortized Cost | 12,462 |
Totals, Amortized Cost | 12,462 | 12,835
Available-for-sale securities, Fair value | 12,282 |
Total, Fair Value | $ 12,282 | $ 12,515

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