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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	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	$ 3,827
Fixed Maturities Securities Available for Sale, Due after one year through five years, Amortized cost	191,522
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Amortized cost	4,588
Fixed Maturities Securities Available for Sale, Due after ten years, Amortized cost
Fixed Maturities Securities Available for Sale, Amortized cost, Total	291,439
Fixed Maturities Securities Available for Sale, Due in one year or less, Fair Value	3,825
Fixed Maturities Securities Available for Sale, Due after one year through five years, Fair Value	190,260
Fixed Maturities Securities Available for Sale, Due after five years through ten years, Fair Value	4,333
Fixed Maturities Securities Available for Sale, Due after ten years, Fair Value
Fixed Maturities Securities Available for Sale, Fair Value, Total	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	91,502
Fixed Maturities Securities Available for Sale, Mortgage-backed Securities, Fair Value	$ 91,000

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