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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator (in millions):        
Net income available to common stockholders $ 34.5 $ 18.5 $ 52.4 $ 35.4
Denominator (in thousands):        
Weighted average common shares outstanding 24,202 24,401 24,251 24,382
Dilutive effect of stock options and awards 469 271 510 250
Denominator for diluted earnings per share 24,671 24,672 24,761 24,632
Net income per share, basic: $ 1.43 $ 0.76 $ 2.16 $ 1.45
Net income per share, diluted: $ 1.40 $ 0.75 $ 2.12 $ 1.44