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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
Mar. 31, 2024
Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Net income $ 100,109 $ 102,962
Average shares outstanding (in shares) 201,210 203,456
Effect of common stock options (in shares) 180 169
Average diluted shares outstanding (in shares) 201,390 203,625
Basic earnings per share (in dollars per share) $ 0.50 $ 0.51
Diluted earnings per share (in dollars per share) $ 0.50 $ 0.51