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Fair Value Measurements - Summary of Carrying Values and Corresponding Fair Values for Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities-held-to-maturity	$ 625,783	$ 561,179
Fixed maturity securities-held-to-maturity	599,087	536,583
Fixed maturity securities-available-for-sale	317,278	237,877
Equity securities	3,598	9,302
Short-term investments	42,411	84,422
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities-held-to-maturity	599,087	536,583
Fixed maturity securities-available-for-sale	317,278	237,877
Equity securities	3,598	9,302
Cash and cash equivalents	118,544	123,077
Short-term investments	42,411	84,422
Other investments	11,228	10,591
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity securities-held-to-maturity	625,783	561,179
Fixed maturity securities-available-for-sale	317,278	237,877
Equity securities	3,598	9,302
Cash and cash equivalents	118,544	123,077
Short-term investments	42,411	84,422
Other investments	$ 11,228	$ 10,591

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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 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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