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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) - USD ($) $ in Thousands	Jun. 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	$ 155,206
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	173,184
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	1,603
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	3,962
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	6,680
Fixed Maturities Securities Available for Sale, Amortized cost, Total	459,931
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	155,253
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	172,994
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	1,601
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	3,999
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	6,679
Fixed Maturities Securities Available for Sale, Fair Value, Total	459,614	$ 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	119,296
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 119,088

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