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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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income (Loss)	$ 22,221	$ 11,238	$ 67,909	$ 12,383
Denominator:
Weighted-average shares outstanding for basic earnings per share	9,861,000	10,977,000	10,199,000	10,945,000
Effect of dilutive securities	683,000	115,000	601,000	172,000
Weighted-average shares adjusted for dilutive securities	10,544,000	11,092,000	10,800,000	11,117,000
Basic	$ 2.25	$ 1.02	$ 6.66	$ 1.13
Diluted	$ 2.11	$ 1.01	$ 6.29	$ 1.11

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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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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-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1505-109256

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- References

No definition available.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

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