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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 5,701	$ 12,282
Weighted average shares outstanding - basic	14,055,022	17,316,015
Net income per share	$ 0.41	$ 0.71
Weighted average shares outstanding - diluted	14,285,837	17,646,080
Net income per share	$ 0.40	$ 0.70

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Schedule Of Earnings Per Share Basic And Diluted [Line Items]

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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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