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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator (in millions):        
Net income available to common stockholders $ 32.3 $ 22.4 $ 68.8 $ 45.8
Denominator (in thousands):        
Weighted average common shares outstanding 24,805,000 24,628,000 24,798,000 24,615,000
Dilutive effect of stock options and awards 166,000 241,000 169,000 241,000
Denominator for diluted earnings per share 24,971,000 24,869,000 24,967,000 24,856,000
Net income per share, basic: $ 1.3 $ 0.91 $ 2.77 $ 1.86
Net income per share, diluted: $ 1.29 $ 0.9 $ 2.76 $ 1.84