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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 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	$ 119,008
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	222,690
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	1,465
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	4,121
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	6,603
Fixed Maturities Securities Available for Sale, Amortized cost, Total	492,369
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	119,037
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	222,847
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	1,427
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	4,172
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	6,624
Fixed Maturities Securities Available for Sale, Fair Value, Total	492,792	$ 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	138,482
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 138,685

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- Definition

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