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TAXATION - Tax Reconciliation between the income tax expenses (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2025 HKD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 HKD ($) | Dec. 31, 2023 HKD ($)
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Income before income tax expenses and share of loss from equity method investments | $ 13,713,159 | $ 1,761,868 | $ 6,535,332 | $ 5,040,925
Tax expenses at Hong Kong profit tax rate of 16.5% | $ 2,262,506 |  | 1,078,165 | 831,588
Hong Kong profit tax rate (as a percent) | 16.50% | 16.50% |  |
Changes in valuation allowance | $ (608) |  | 164,511 | 65,581
Tax effect of permanence differences |  |  | 37,803 | 49,787
Effect of income tax jurisdictions other than Hong Kong |  |  | 19,836 | 20,873
Super deduction of research and development expenses |  |  | (132,257) | (132,704)
Final settlement differences |  |  | 11,484 | 11,756
Income not subject to tax | (397,429) |  | (181,200) | (98,402)
Foreign tax effects | 177,742 |  |  |
Income tax expenses | $ 2,359,633 | $ 303,166 | $ 998,342 | $ 748,479
Hong Kong |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Hong Kong profit tax rate (as a percent) |  |  | 16.50% | 16.50%

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