Earnings Per Share - Basic and Diluted Weighted Average Shares Outstanding Used to Compute Earnings Per Share (Detail) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	37,210	37,655	37,299	37,698
Dilutive effect of stock options and full value awards	88	34	78	42
Diluted weighted average shares outstanding	37,298	37,689	37,377	37,740
Basic earnings per share	$ 1.91	$ 1.72	$ 2.31	$ 3.65
Diluted earnings per share	$ 1.91	$ 1.72	$ 2.31	$ 3.64