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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 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	$ 34,979
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	266,958
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	3,006
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	3,990
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	6,557
Fixed Maturities Securities Available for Sale, Amortized cost, Total	498,598
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	34,960
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	268,810
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	3,055
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	4,084
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	6,799
Fixed Maturities Securities Available for Sale, Fair Value, Total	501,230	$ 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	183,108
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 183,522

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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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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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