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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, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]            
Net income $ 101,530 $ 100,109 $ 105,271 $ 102,962 $ 201,639 $ 208,233
Average shares outstanding (in shares) 200,319   202,793   200,765 203,122
Effect of common stock options (in shares) 146   130   144 152
Average diluted shares outstanding (in shares) 200,465   202,923   200,909 203,274
Basic earnings per share (in dollars per share) $ 0.51   $ 0.52   $ 1.00 $ 1.03
Diluted earnings per share (in dollars per share) $ 0.51   $ 0.52   $ 1.00 $ 1.02