Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Share - Additional Information (Detail)

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Net Income (Loss) Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]      
Total number of class of stock outstanding 2    
Common stock equivalents 4.4 5.1 1.3