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Investments - Amortized Cost and Fair Value of Investments With Contractual Maturities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 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	$ 79,061
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	171,757
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	138
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost	3,652
Fixed Maturities Securities Available for Sale, Amortized cost, Total	354,261
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	78,943
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	170,939
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	128
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value	3,676
Fixed Maturities Securities Available for Sale, Fair Value, Total	352,983	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	95,599
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	95,238
Perpetual Maturity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Amortized Cost	4,054
Fixed Maturities Securities Available for Sale, Perpetual Maturity, Fair Value	$ 4,059

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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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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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. 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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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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Amount of available for sale securities with contractual maturities.

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Amount of available-for-sale debt securities at fair value, that do not have a maturity date.

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