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Equity Method Investments in Affiliates - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Feb. 07, 2011
Schedule of Equity Method Investments [Line Items]
Dividends received from whitehall	$ 7.6

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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