Annual report pursuant to Section 13 and 15(d)

EARNINGS PER SHARE - Additional Information (Detail)

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EARNINGS PER SHARE - Additional Information (Detail)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Abstract]      
Shares excluded from diluted earnings per share that may be issued upon the exercise of employee stock options because such effect would be antidilutive 2.6 7.4 11.1