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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 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]                
Net income $ 100,038 $ 101,530 $ 100,109 $ 98,453 $ 105,271 $ 102,962 $ 301,677 $ 306,686
Average shares outstanding (in shares) 199,380     202,526     200,300 202,921
Effect of common stock options (in shares) 81     124     130 147
Average diluted shares outstanding (in shares) 199,461     202,650     200,430 203,068
Basic earnings per share (in dollars per share) $ 0.50     $ 0.49     $ 1.51 $ 1.51
Diluted earnings per share (in dollars per share) $ 0.50     $ 0.49     $ 1.51 $ 1.51