Earnings Per Share - Basic and Diluted Weighted Average Shares Outstanding Used to Compute Earnings Per Share (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Basic weighted average shares outstanding	37,056	37,600	37,546
Dilutive effect of stock options and Full Value Awards	81	72	108
Diluted weighted average shares outstanding	37,137	37,672	37,654
Basic earnings per share	$ 6.66	$ 7.29	$ 6.87
Diluted earnings per share	$ 6.64	$ 7.28	$ 6.85