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						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income	$ 97,891	$ 109,245	$ 79,424	$ 79,709	$ 62,474	$ 37,291	$ 286,560	$ 179,474
Denominator:
Denominator for basic earnings per share-weighted average common shares	26,539			26,334			26,506	26,317
Dilutive effect of share-based awards	137			379			157	382
Denominator for diluted earnings per share-adjusted weighted average common shares	26,676			26,713			26,663	26,699
Basic Earnings Per Share	$ 3.69			$ 3.03			$ 10.81	$ 6.82
Diluted Earnings Per Share	$ 3.67			$ 2.98			$ 10.75	$ 6.72