Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations - Additional Information (Detail)

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Discontinued Operations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations  
Proceeds from sales of discontinued operations $ 30.1