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Investments - Amortized Cost and Fair Value of Fixed Maturities Available for Sale by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fixed Maturities Securities Available for Sale, Due in one year or less, Amortized cost	$ 52,364
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	165,335
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	5,094
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	2,636
Fixed Maturities Securities Available for Sale, Amortized cost, Total	323,425
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	52,346
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	165,278
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	4,970
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	2,678
Fixed Maturities Securities Available for Sale, Fair Value, Total	323,145	289,418
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	95,054
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	94,908
Perpetual Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	2,942
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	$ 2,965

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through 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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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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