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Earnings Per Share (Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income	$ 6,686	$ 6,065	$ 20,415	$ 13,722
Denominator:
Weighted average shares of common stock outstanding	11,930	11,848	11,920	11,839
Effect of dilutive common stock equivalents	165	100	143	86
Weighted average shares of common stock outstanding	12,095	11,948	12,063	11,925
Basic earnings (loss) per share
Earnings per share	$ 0.56	$ 0.51	$ 1.71	$ 1.16
Diluted earnings (loss) per share
Earnings per share	$ 0.55	$ 0.51	$ 1.69	$ 1.15

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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