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Earnings Per Share - Summary of Earnings Per Share (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator (in millions):        
Net income available to common stockholders $ 20.8 $ 14.0 $ 56.2 $ 49.1
Denominator (in thousands):        
Weighted average common shares outstanding 24,420 23,621 24,394 23,518
Dilutive effect of stock options and awards 495 475 455 567
Denominator for diluted earnings per share 24,915 24,096 24,849 24,085
Net income per share, basic: $ 0.85 $ 0.59 $ 2.30 $ 2.09
Net income per share, diluted: $ 0.83 $ 0.58 $ 2.26 $ 2.04