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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income	$ 8,369	$ 8,482	$ 16,477	$ 17,126
Denominator:
Weighted-average shares outstanding for basic earnings per share	11,706	11,658	11,709	11,638
Effect of dilutive securities	316	480	340	446
Weighted-average shares adjusted for dilutive securities	12,022	12,138	12,049	12,084
Basic	$ 0.71	$ 0.73	$ 1.41	$ 1.47
Diluted	$ 0.70	$ 0.70	$ 1.37	$ 1.42

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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