Earnings Per Share - Basic and Diluted Weighted Average Shares Outstanding Used to Compute Earnings Per Share (Detail) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	37,527	37,491	37,641	37,485
Dilutive effect of stock options and full value awards	81	83	55	118
Diluted weighted average shares outstanding	37,608	37,574	37,696	37,603
Basic earnings per share	$ 1.9	$ 1.47	$ 5.55	$ 5.03
Diluted earnings per share	$ 1.9	$ 1.46	$ 5.55	$ 5.01