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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, 2019	Mar. 31, 2018
Numerator:
Net income	$ 20,750	$ 12,222
Denominator:
Weighted average shares of common stock outstanding	11,880	12,030
Effect of dilutive common stock equivalents	360	109
Weighted average shares of common stock outstanding	12,240	12,139
Basic earnings per share
Earnings per share	$ 1.75	$ 1.02
Diluted earnings per share
Earnings per share	$ 1.70	$ 1.01

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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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