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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income	$ 8,108	$ 8,644
Denominator:
Weighted average shares outstanding for basic earnings per share	11,712	11,618
Effect of dilutive securities	364	412
Weighted average shares adjusted for dilutive securities	12,076	12,030
Basic	$ 0.69	$ 0.74
Diluted	$ 0.67	$ 0.72

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- Definition

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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