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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Fixed Maturities Securities Available for Sale, Due in one year or less, Amortized cost	$ 48,919
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	229,278
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	34,165
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	54,697
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	12,723
Fixed Maturities Securities Available for Sale, Amortized cost, Total	596,461
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	48,920
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	228,000
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	33,301
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	51,675
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	12,691
Fixed Maturities Securities Available for Sale, Fair Value, Total	589,363	$ 441,104
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	216,679
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 214,776

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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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