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Derivative Financial Assets - Summary of financial instrument fair value (Detail) - HKD ($)
 3 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Fair value using valuation technique [member]                
Disclosure Of Derivative Financial Instrument Fair Value Change In Profit Or Loss And Other Comprehensive Income [Line Items]                
Beginning balance $ 1,315,842,010 $ 1,248,566,044 $ 1,212,998,518 $ 968,386,750 $ 1,081,207,567 $ 990,853,956 $ 1,022,223,853 $ 1,036,169,019
Changes in fair value 934,937 83,632,460 44,938,920 201,787,611 (111,313,048) 89,306,993 (34,326,652) (12,266,453)
Partial settlement (15,306,985)              
Realized gain upon disposal 3,786,355              
Contract renegotiation 80,156 (16,356,494) (9,371,394) 42,824,157 (1,507,769) 1,046,618 2,956,755 (1,678,713)
Ending balance 1,305,336,473 1,315,842,010 1,248,566,044 1,212,998,518 968,386,750 1,081,207,567 990,853,956 1,022,223,853
Fair value using valuation technique [member] | Previously Reported [Member]                
Disclosure Of Derivative Financial Instrument Fair Value Change In Profit Or Loss And Other Comprehensive Income [Line Items]                
Beginning balance 1,332,198,504 1,257,937,438 1,170,174,361 969,894,519 1,080,160,949 987,897,201 1,023,902,566  
Ending balance 1,305,256,317 1,332,198,504 1,257,937,438 1,170,174,361 969,894,519 1,080,160,949 987,897,201 1,023,902,566
Day 1 profit or loss [member]                
Disclosure Of Derivative Financial Instrument Fair Value Change In Profit Or Loss And Other Comprehensive Income [Line Items]                
Beginning balance 16,356,494 9,371,394 (42,824,157) 1,507,769 (1,046,618) (2,956,755) 1,678,713 (12,266,453)
Recognition of day 1 profit or loss (16,356,494) (9,371,394) 42,824,157 (1,507,769) 1,046,618 2,956,755 (1,678,713) 12,266,453
Contract renegotiation (80,156) 16,356,494 9,371,394 (42,824,157) 1,507,769 (1,046,618) (2,956,755) 1,678,713
Ending balance (80,156) 16,356,494 9,371,394 (42,824,157) 1,507,769 (1,046,618) (2,956,755) 1,678,713
Net carrying amount presented on the statement of financial position [member]                
Disclosure Of Derivative Financial Instrument Fair Value Change In Profit Or Loss And Other Comprehensive Income [Line Items]                
Beginning balance 1,332,198,504 1,257,937,438 1,170,174,361 969,894,519 1,080,160,949 987,897,201 1,023,902,566 1,023,902,566
Changes in fair value 934,937 83,632,460 44,938,920 201,787,611 (111,313,048) 89,306,993 (34,326,652) (12,266,453)
Partial settlement (15,306,985)              
Realized gain upon disposal 3,786,355              
Recognition of day 1 profit or loss (16,356,494) (9,371,394) 42,824,157 (1,507,769) 1,046,618 2,956,755 (1,678,713) 12,266,453
Ending balance 1,305,256,317 1,332,198,504 1,257,937,438 1,170,174,361 969,894,519 1,080,160,949 987,897,201 1,023,902,566
Net carrying amount presented on the statement of financial position [member] | Previously Reported [Member]                
Disclosure Of Derivative Financial Instrument Fair Value Change In Profit Or Loss And Other Comprehensive Income [Line Items]                
Beginning balance 1,332,198,504 1,257,937,438 1,170,174,361 969,894,519 1,080,160,949 987,897,201 1,023,902,566  
Ending balance 1,305,256,317 1,332,198,504 1,257,937,438 1,170,174,361 969,894,519 1,080,160,949 987,897,201 1,023,902,566
Net fair value change on derivative financial instrument presented on the statement of profit or loss and other comprehensive income [member]                
Disclosure Of Derivative Financial Instrument Fair Value Change In Profit Or Loss And Other Comprehensive Income [Line Items]                
Beginning balance 362,303,985 288,042,919 200,279,842 (54,008,047) 56,258,383 (36,005,365)    
Beginning balance       0        
Changes in fair value 934,937 83,632,460 44,938,920 201,787,611 (111,313,048) 89,306,993 (34,326,652) (12,266,453)
Recognition of day 1 profit or loss (16,356,494) (9,371,394) 42,824,157 (1,507,769) 1,046,618 2,956,755 (1,678,713) $ 12,266,453
Ending balance 346,882,428 362,303,985 288,042,919 200,279,842 (54,008,047) 56,258,383 (36,005,365)  
Net fair value change on derivative financial instrument presented on the statement of profit or loss and other comprehensive income [member] | Previously Reported [Member]                
Disclosure Of Derivative Financial Instrument Fair Value Change In Profit Or Loss And Other Comprehensive Income [Line Items]                
Beginning balance 362,303,985 288,042,919 200,279,842 (54,008,047) 56,258,383 (36,005,365)    
Ending balance $ 346,882,428 $ 362,303,985 $ 288,042,919 $ 200,279,842 $ (54,008,047) $ 56,258,383 $ (36,005,365)