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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Jun. 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	$ 49,496
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	216,335
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	124,206
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	24,577
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	11,762
Fixed Maturities Securities Available for Sale, Amortized cost, Total	668,868
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	49,286
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	211,886
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	121,788
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	24,433
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	11,937
Fixed Maturities Securities Available for Sale, Fair Value, Total	656,762	$ 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	242,492
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 237,432

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