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Fair Value Measurements - Summary of Carrying Values and Corresponding Fair Values for Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities-held-to-maturity	$ 659,172	$ 662,276
Fixed maturity securities-held-to-maturity	639,632	645,164
Fixed maturity securities-available-for-sale	416,568	380,022
Equity securities	31	31
Short-term investments	11,713	7,718
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities-held-to-maturity	639,632	645,164
Fixed maturity securities-available-for-sale	416,568	380,022
Equity securities	31	31
Cash and cash equivalents	79,290	69,481
Short-term investments	11,713	7,718
Other investments	11,390	12,217
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities-held-to-maturity	659,172	662,276
Fixed maturity securities-available-for-sale	416,568	380,022
Equity securities	31	31
Cash and cash equivalents	79,290	69,481
Short-term investments	11,713	7,718
Other investments	$ 11,390	$ 12,217

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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