Schedule Of Computation of Earnings Per Share - Summary of Calculation of Basic Earnings Per Common Share and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net income	$ 76,097	$ 79,424
Denominator:
Denominator for basic earnings per share-weighted average common shares	26,600	26,391
Dilutive effect of share-based awards	102	279
Denominator for diluted earnings per share-adjusted weighted average common shares	26,702	26,670
Basic Earnings Per Share	$ 2.86	$ 3.01
Diluted Earnings Per Share	$ 2.85	$ 2.98