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Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income	$ 17,606	$ 23,395	$ 41,157	$ 69,182
Average number of common shares outstanding (in shares)	29,764	30,509	29,971	30,464
Effect of dilutive stock options and restricted stock (in shares)	80	120	112	179
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)	29,844	30,629	30,083	30,643
Options excluded from diluted earnings per share because of their antidilutive effect (in shares)	0	42	0	42

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- Definition

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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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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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