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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income (Loss)	$ 20,166	$ 7,470	$ 45,688	$ 1,145
Denominator:
Weighted-average shares outstanding for basic earnings per share	10,200,000	10,962,000	10,371,000	10,929,000
Effect of dilutive securities	597,000	51,000	560,000	201,000
Weighted-average shares adjusted for dilutive securities	10,797,000	11,013,000	10,931,000	11,130,000
Basic	$ 1.98	$ 0.68	$ 4.41	$ 0.10
Diluted	$ 1.87	$ 0.68	$ 4.18	$ 0.10

X

- Definition

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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