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Summary of Investments (Parenthetical) (Detail) (Private Debt Obligations, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2008
Private Debt Obligations
Schedule of Available-for-sale Securities [Line Items]
Other than temporary losses impairment on available-for-sale securities	$ 13.2	$ 13.2

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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