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Earnings Per Share Attributable To Ordinary Equity Holders of The Parent - Summary of Basic and diluted earnings per share (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator:      
Profit attributable to ordinary equity holders of the parent used in the basic earnings per share $ 1,110,007,521 $ 1,096,452,084 $ 1,059,973,270
Class A ordinary shares [Member]      
Numerator:      
Profit attributable to ordinary equity holders of the parent used in the basic earnings per share $ 513,186,052 $ 299,742,816 $ 249,206,548
Denominator:      
Weighted average number of shares outstanding—basic 138,490,789 62,327,851 57,474,495
Basic earnings per share $ 3.71 $ 4.81 $ 4.34
Numerator:      
Profit attributable to ordinary equity holders of the parent used in the diluted earnings per share $ 513,186,052 $ 299,742,816 $ 248,629,790
Denominator:      
Weighted average number of ordinary shares outstanding—diluted 138,490,789 62,327,851 58,966,142
Diluted earnings per share $ 3.71 $ 4.81 $ 4.22
Class B ordinary shares [Member]      
Numerator:      
Profit attributable to ordinary equity holders of the parent used in the basic earnings per share $ 596,821,469 $ 796,709,268 $ 810,766,722
Denominator:      
Weighted average number of shares outstanding—basic 160,959,872 165,665,944 186,987,093
Basic earnings per share $ 3.71 $ 4.81 $ 4.34
Numerator:      
Profit attributable to ordinary equity holders of the parent used in the diluted earnings per share $ 596,821,469 $ 796,709,268 $ 810,766,722
Denominator:      
Weighted average number of ordinary shares outstanding—diluted 160,959,872 165,665,944 186,987,093
Diluted earnings per share $ 3.71 $ 4.81 $ 4.34