Stock-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Stock Options Issued (Detail)	12 Months Ended
	Dec. 31, 2024 $ / shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in usd per share)	$ 33.79	$ 0	$ 44.44
Directors | 45058
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in usd per share)	33.79
Fair value per option (in usd per share)	$ 6.53
Volatility	0.319
Expected life (years)	5 years
Assumed yield	4.94%
Risk-free rate	3.45%
Directors | 44694
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in usd per share)	$ 47.90
Fair value per option (in usd per share)	$ 8.34
Volatility	0.300
Expected life (years)	5 years
Assumed yield	4.90%
Risk-free rate	2.89%
Officers | 45058
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in usd per share)	$ 33.79
Fair value per option (in usd per share)	$ 6.06
Volatility	0.288
Expected life (years)	7 years
Assumed yield	4.96%
Risk-free rate	3.45%
Officers | 44694
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price (in usd per share)	$ 47.90
Fair value per option (in usd per share)	$ 7.66
Volatility	0.271
Expected life (years)	7 years
Assumed yield	4.93%
Risk-free rate	2.95%