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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
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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