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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) ¥ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 CNY (¥) director | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Shareholders of Management HoldCo |  |  |  |
VIEs financial information |  |  |  |
Loans | ¥ 1,000 |  | ¥ 1,000 |
GDS Beijing and GDS Shanghai |  |  |  |
VIEs financial information |  |  |  |
Ownership transferred (as a percent) | 100.00% |  |  |
Number of directors replacing prior sold director | director | 3 |  |  |
VIEs |  |  |  |
VIEs financial information |  |  |  |
Costs for outsourcing and other services provided by other consolidated entities within the Company |  | ¥ 3,076,398 | 2,017,032 | ¥ 1,260,481
VIEs | Management HoldCo |  |  |  |
VIEs financial information |  |  |  |
Loans | ¥ 310,100 |  | ¥ 310,100 |
Right of GDS Investment Company to require repayment of the loans, prior notice period |  |  | 30 days |

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