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Earnings per share - Schedule of Computation of the Income (Loss) and Share Data Used in the Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Basic earnings per share—      
Net profit $ 671,648 $ 608,114 $ 514,097
Weighted-average shares outstanding (in shares) 41,136,000 41,670,000 40,105,000
Non-vested dividend participating awards (in shares) 122,000 127,000 123,000
Weighted average number of ordinary shares used in calculating basic earnings per share (in shares) 41,258,000 41,797,000 40,228,000
Basic (in dollars per share) $ 16.28 $ 14.55 $ 12.78
Diluted earnings per share—      
Net profit $ 671,648 $ 608,114 $ 514,097
Weighted average number of ordinary shares used in calculating diluted earnings per share (in shares) 41,258,000 41,797,000 40,228,000
Diluted (in dollars per share) $ 16.28 $ 14.55 $ 12.78