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Net Earnings Per Common Share - Additional Information (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 Disclosure [Line Items]        
Anti-dilutive securities excluded from determination of diluted earnings per common share 0 0.1 0 0.1