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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, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Common share equivalents not included in the computation of diluted weighted average shares outstanding 1.5 1.3 1.3