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Earnings per Share (Detail)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Antidilutive securities excluded from computation of earnings per share, amount 0.4 0.4 0.3 0.3