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Investments - Effect of Trading Activities by Type of Instrument and by Line Item in Condensed Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Net Investment Income [Line Items]
Total realized gains (losses) on trading portfolio	$ (16,037)
Total change in unrealized gains (losses) on trading portfolio	7,874
Net gains (losses) recognized on trading portfolio	(8,163)
Equity Securities [Member]
Net Investment Income [Line Items]
Total realized gains (losses) on trading portfolio	(15,969)
Total change in unrealized gains (losses) on trading portfolio	7,758
Derivatives (Non-Hedging Instruments) [Member]
Net Investment Income [Line Items]
Total realized gains (losses) on trading portfolio	(68)
Total change in unrealized gains (losses) on trading portfolio	89
Fixed Maturities [Member]
Net Investment Income [Line Items]
Total change in unrealized gains (losses) on trading portfolio	13
Other Investments [Member]
Net Investment Income [Line Items]
Total change in unrealized gains (losses) on trading portfolio	$ 14