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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 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	$ 42,233
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	229,841
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	47,716
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	58,110
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	13,336
Fixed Maturities Securities Available for Sale, Amortized cost, Total	610,557
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	42,233
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	229,898
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	47,879
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	57,127
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	13,944
Fixed Maturities Securities Available for Sale, Fair Value, Total	609,179	$ 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	219,321
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 218,098

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- Definition

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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Amount after adjustments of available-for-sale debt securities at cost, maturing after the tenth 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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