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FAIR VALUE MEASUREMENT (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Schedule of the financial instruments, measured at fair value, by level within the fair value hierarchy on recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Fair value measurement at reporting date using
​ | ​ | ​ | ​ | Quoted prices | ​ | Significant | ​ | Significant
​ | ​ | ​ | ​ | in active | ​ | other | ​ | other
​ | ​ | ​ | ​ | markets for | ​ | observable | ​ | unobservable
​ | ​ | ​ | ​ | identical assets | ​ | inputs | ​ | inputs
​ | ​ | December 31, | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2024 | ​ ​ ​ | (Level 1) | ​ ​ ​ | (Level 2) | ​ ​ ​ | (Level 3)
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB
​ | ​ | (in thousands)
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value disclosure | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term time deposits | ​ | 14,874,498 | ​ | — | ​ | 14,874,498 | ​ | —
Held-to-maturity debt investments | ​ | 5,420,043 | ​ | — | ​ | 5,420,043 | ​ | —
Long-term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term time deposits | ​ | 15,568,643 | ​ | — | ​ | 15,568,643 | ​ | —
Held-to-maturity debt investments |  | 1,798,444 | ​ | — | ​ | 1,798,444 | ​ | —
Fair value measurements on a recurring basis |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Wealth management products |  | 20,474,093 | ​ | — | ​ | 19,224,772 | ​ | 1,249,321
Available-for-sale debt investments | ​ | 551,348 | ​ | — | ​ | 551,348 | ​ | —
Long-term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity investments without readily determinable fair value using the NAV practical expedient (i) | ​ | 60,691 | ​ | ​ | ​ | ​ | ​ | ​
Investments accounted for at fair value | ​ | 1,014,400 | ​ | 56,164 | ​ | 891,192 | ​ | 67,044
Available-for-sale debt investments |  | 4,935,699 | ​ | — | ​ | 4,935,699 | ​ | —
Total |  | 64,697,859 | ​ | 56,164 | ​ | 63,264,639 | ​ | 1,316,365
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | ​ | ​ ​ ​ | Fair value measurement at reporting date using
​ | ​ | ​ | ​ | Quoted prices | ​ | Significant | ​ | Significant
​ | ​ | ​ | ​ | in active | ​ | other | ​ | other
​ | ​ | ​ | ​ | markets for | ​ | observable | ​ | unobservable
​ | ​ | ​ | ​ | identical assets | ​ | inputs | ​ | inputs
​ | ​ | December 31, | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2025 | ​ ​ ​ | (Level 1) | ​ ​ ​ | (Level 2) | ​ ​ ​ | (Level 3)
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | RMB
​ | ​ | (in thousands)
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value disclosure | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term time deposits | ​ | 7,057,770 | ​ | — | ​ | 7,057,770 | ​ | —
Held-to-maturity debt investments | ​ | 5,453,966 | ​ | — | ​ | 5,453,966 | ​ | —
Long-term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term time deposits | ​ | 11,477,840 | ​ | — | ​ | 11,477,840 | ​ | —
Held-to-maturity debt investments |  | 1,079,884 | ​ | — | ​ | 1,079,884 | ​ | —
Fair value measurements on a recurring basis |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Wealth management products |  | 21,625,789 | ​ | — | ​ | 20,736,797 | ​ | 888,992
Available-for-sale debt investments |  | 5,370,207 | ​ | — | ​ | 5,370,207 | ​ | —
Long-term investments | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity investments without readily determinable fair value using the NAV practical expedient (i) | ​ | 59,446 | ​ | ​ | ​ | ​ | ​ | ​
Investments accounted for at fair value | ​ | 5,717,276 | ​ | 53,674 | ​ | 5,580,750 | ​ | 82,852
Total |  | 57,842,178 | ​ | 53,674 | ​ | 56,757,214 | ​ | 971,844
(i) | Investments are measured at fair value using the NAV as a practical expedient. These investments have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheet.
Short-term investment |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Schedule of reconciliations of assets categorized within Level 3 under the fair value hierarchy | ​
​ | ​ | ​
​ | ​ | Amounts
​ | ​ | RMB
​ | ​ ​ ​ | (in thousands)
Fair value as of December 31, 2023 | ​ | 2,415,208
Addition | ​ | 357,930
Change in fair value (i) | ​ | 57,579
Exchange adjustment | ​ | 30,163
Disposal | ​ | (1,611,559)
Fair value as of December 31, 2024 | ​ | 1,249,321
Addition |  | —
Change in fair value (i) |  | 73,241
Exchange adjustment |  | (27,396)
Disposal |  | (406,174)
Fair value as of December 31, 2025 |  | 888,992
(i) | Recognized as “Fair value changes in investments, net” on the consolidated statements of comprehensive income.
Long-term investments |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Schedule of reconciliations of assets categorized within Level 3 under the fair value hierarchy | ​
​ | ​ | ​
​ | ​ | Amounts
​ | ​ | RMB
​ | ​ ​ ​ | (in thousands)
Fair value as of December 31, 2023 | ​ | 115,167
Addition | ​ | 100
Change in fair value (i) | ​ | (43,196)
Disposal | ​ | (5,027)
Fair value as of December 31, 2024 | ​ | 67,044
Addition |  | 12,088
Change in fair value (i) |  | 3,820
Disposal |  | (100)
Fair value as of December 31, 2025 |  | 82,852
(i)Recognized as “Fair value changes in investments, net” on the consolidated statements of comprehensive income.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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