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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income	$ 13,781	$ 6,686	$ 40,136	$ 20,415
Denominator:
Weighted average shares of common stock outstanding	11,954	11,930	12,006	11,920
Effect of dilutive common stock equivalents	143	165	106	143
Weighted average shares of common stock outstanding	12,097	12,095	12,112	12,063
Basic earnings per share
Earnings per share	$ 1.15	$ 0.56	$ 3.34	$ 1.71
Diluted earnings per share
Earnings per share	$ 1.14	$ 0.55	$ 3.31	$ 1.69

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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 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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