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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Total net realized investment gains (losses)	$ (10,778)	$ 1,158	$ (7,216)	$ 40,226
Not Designated as Hedging Instrument | Interest Rate Swap
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains		147
Gross realized losses	(8,071)	(1,339)	(8,896)	(13,552)
Total net realized investment gains (losses)	(8,071)	(1,192)	(8,896)	(13,552)
Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	110	262	1,589	2,651
Gross realized losses	(1,451)	(471)	(1,692)	(697)
Total net realized investment gains (losses)	(1,341)	(209)	(103)	1,954
Common Shares
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains	3,494	2,559	9,418	52,434
Gross realized losses	(4,860)		(7,731)	(610)
Total net realized investment gains (losses)	$ (1,366)	$ 2,559	1,687	$ 51,824
Preferred Stock
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains			96
Total net realized investment gains (losses)			$ 96

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Marketable Securities Gross Realized Gain

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This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



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-Name Accounting Standards Codification



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Reference 3: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



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