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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Available For Sale Securities [Line Items]
Fixed Maturities Securities Available for Sale, Due in one year or less, Amortized cost	$ 51,846
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	235,323
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	56,806
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	75,725
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	12,059
Fixed Maturities Securities Available for Sale, Amortized cost, Total	653,715
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	51,804
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	233,849
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	56,677
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	75,073
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	12,479
Fixed Maturities Securities Available for Sale, Fair Value, Total	649,334	$ 589,363
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	221,956
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 219,452

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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