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Gain on Sale of Investment - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2009
Gain (Loss) on Investments [Line Items]  
Consideration received from sale of minority ownership interest $ 144.9
Sale of minority ownership interest, nonoperating pretax gain 94.9
Sale of minority ownership interest, nonoperating after tax gain $ 58.8
Sale of minority ownership interest, nonoperating after tax gain per share $ 0.05