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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Fixed Maturities Securities Available for Sale, Due in one year or less, Amortized cost	$ 57,230
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	222,963
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	1,460
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	4,119
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	6,534
Fixed Maturities Securities Available for Sale, Amortized cost, Total	443,634
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	57,214
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	221,403
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	1,349
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	4,229
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	6,749
Fixed Maturities Securities Available for Sale, Fair Value, Total	441,104	$ 403,939
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	151,328
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 150,160

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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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