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Condensed Balance Sheets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Equity securities, cost	$ 1,436,540	$ 775,741
Debt securities, amortized cost	15,593,278	2,538,872
Parent Company
Condensed Financial Statements, Captions [Line Items]
Equity securities, cost	155,441	129,903
Debt securities, amortized cost	$ 289,709

Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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