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Earnings Per Common Share - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
(Increase) decrease in income attributable to common shareholders $ 0 $ 0.4 $ 0.5 $ 0.4
Option to purchase common stock shares not included in the computation of diluted EPS 0.6 0.6 1.3 1.3