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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule Of Available For Sale Securities [Line Items] |  |
Fixed Maturities Securities Available for Sale, Due in one year or less, Amortized cost | $ 65,340 |
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost | 246,639 |
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost | 158,771 |
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost | 15,693 |
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost | 11,922 |
Debt Securities, Cost or Amortized Cost | 773,493 |
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value | 65,054 |
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value | 242,313 |
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value | 156,385 |
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value | 15,491 |
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value | 11,937 |
Fixed Maturities Securities Available for Sale, Fair Value, Total | 760,408 | $ 649,334
Mortgage-Backed and Asset-Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Amortized cost | 275,128 |
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value | $ 269,228 |

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