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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator (in millions):
Net income available to common stockholders	$ 112.2	$ 85.0	$ 61.8
Denominator (in thousands):
Weighted average common shares outstanding	24,482	24,401	24,148
Dilutive effect of stock options and awards	246	202	338
Denominator for diluted earnings per share	24,728	24,603	24,486
Net income per share, basic:	$ 4.58	$ 3.48	$ 2.56
Net income per share, diluted:	$ 4.54	$ 3.45	$ 2.52

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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