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Earnings Per Share (Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income	$ 12,222	$ 6,145
Denominator:
Weighted average shares of common stock outstanding	12,030	11,901
Effect of dilutive common stock equivalents	109	108
Weighted average shares of common stock outstanding	12,139	12,009
Basic earnings per share
Earnings per share	$ 1.02	$ 0.52
Diluted earnings per share
Earnings per share	$ 1.01	$ 0.51

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

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