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Earnings Per Common Share (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Increase (decrease) in income attributable to common shareholders $ (0.5) $ (0.3) $ (1.2) $ (0.8)
Option to purchase common stock shares not included in the computation of diluted EPS (in shares) 0.5 0.3 0.5 0.6