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Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 28,362	$ 7,430	$ 62,011	$ 23,551
Average number of common shares outstanding (in shares)	29,719	29,754	29,723	30,074
Effect of dilutive stock options and restricted stock (in shares)	185	129	181	129
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)	29,904	29,883	29,904	30,203
Options excluded from diluted earnings per share because of their antidilutive effect (in shares)	0	0	0	0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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