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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 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	$ 61,458
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	216,211
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	86,662
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	42,833
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	12,671
Fixed Maturities Securities Available for Sale, Amortized cost, Total	653,888
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	61,266
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	212,187
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	85,479
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	42,879
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	12,928
Fixed Maturities Securities Available for Sale, Fair Value, Total	644,238	$ 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	234,053
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 229,499

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- Definition

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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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