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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		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Numerator:
Net income	$ 8,482	$ 6,135	$ 17,126	$ 13,769	$ 29,963
Denominator:
Weighted average shares outstanding for basic earnings per share	11,658	11,554	11,638	11,524
Effect of dilutive securities	480	176	446	199
Weighted average shares adjusted for dilutive securities	12,138	11,730	12,084	11,723
Basic	$ 0.73	$ 0.53	$ 1.47	$ 1.19
Diluted	$ 0.70	$ 0.52	$ 1.42	$ 1.17

X

- 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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