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Derivative Financial Assets - Summary of financial instrument fair value (Detail) - HKD ($) | 3 Months Ended
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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) |

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