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Nature of Operations and Summary of Significant Accounting Policies - Computation of Basic and Diluted Earnings per Common Share (EPS) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Net income $ 118,403 $ 101,530 $ 233,612 $ 201,639
Average shares outstanding (in shares) 197,532 200,319 198,091 200,765
Effect of common stock options (in shares) 233 146 198 144
Average diluted shares outstanding (in shares) 197,765 200,465 198,289 200,909
Basic earnings per share (in dollars per share) $ 0.60 $ 0.51 $ 1.18 $ 1.00
Diluted earnings per share (in dollars per share) $ 0.60 $ 0.51 $ 1.18 $ 1.00