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Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share Reconciliation [Abstract]
Income available to common stockholders	$ 22,608	$ 31,837
Income available to common stockholders plus assumed exercises of stock options	$ 22,608	$ 31,837
Income available to common stockholders - Shares	32,679,587	32,612,399
Dilutive effect of stock options - Shares	607,772	680,453
Income available to common stockholders plus assumed exercises of stock options - Shares	33,287,359	33,292,852
Income available to common stockholders - Per Share Amount	$ 0.69	$ 0.98
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount	$ 0.68	$ 0.96

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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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