Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Additional Information (Detail)

v2.4.0.6
Earnings Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Equity grants with anti-dilutive effect 4.2 1.8