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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Financial statement balances and amounts of the VIEs and their subsidiaries (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current assets      
Cash ¥ 16,259,457 ¥ 5,810,938  
Accounts receivable, net of allowance for doubtful accounts 1,480,335 879,962  
VAT recoverable 155,620 129,994  
Prepaid expenses 163,986 80,913  
Other current assets 172,579 148,603  
Total current assets 18,318,806 7,084,709  
Property and equipment, net 29,596,061 19,184,639  
Intangible assets, net 785,322 394,628  
Operating lease right-of-use assets 3,059,700 796,679  
Deferred tax assets 146,088 72,931  
Restricted cash 146,643 128,025  
VAT recoverable 1,445,521 888,483  
Other non-current assets 486,071 289,410  
Total assets 57,258,795 31,492,531  
Current liabilities      
Short-term borrowings and current portion of long-term borrowings 2,153,390 1,137,737  
Accounts payable 3,657,112 1,675,966  
Accrued expenses and other payables 1,395,981 817,883  
Deferred revenue 96,668 90,316  
Operating lease liabilities, current 86,258 55,139  
Finance lease and other financing obligations, current 254,412 222,473  
Total current liabilities 7,643,821 3,999,514  
Long-term borrowings, excluding current portion 10,566,746 8,028,473  
Operating lease liabilities, non-current 1,542,895 709,998  
Finance lease and other financing obligations, non-current 8,097,881 4,751,121  
Deferred tax liabilities 462,007 252,672  
Other long-term liabilities 349,257 345,537  
Amounts due to GDS Holdings and its non-VIE subsidiaries, net 15,360 11,988  
Total liabilities 30,591,073 20,136,969  
Net revenue, net income, operating, investing and financing cash flows      
Net revenue 5,738,972 4,122,405 ¥ 2,792,077
Net (loss) income (669,214) (442,083) (430,268)
Net cash provided by operating activities 320,887 293,436 (12,910)
Net cash used in investing activities (9,378,007) (5,131,231) (4,733,050)
Net cash provided by (used in) financing activities 20,143,661 8,361,939 4,876,806
Asset Pledged as Collateral [Member]      
Current assets      
Property and equipment, net 3,497,447 2,493,872  
VIEs      
Current assets      
Cash 1,310,269 730,960  
Accounts receivable, net of allowance for doubtful accounts 1,388,128 858,764  
VAT recoverable 85,760 46,817  
Prepaid expenses 76,505 39,124  
Other current assets 13,259 32,929  
Total current assets 2,873,921 1,708,594  
Property and equipment, net 2,760,618 2,911,727  
Intangible assets, net 194,230 159,860  
Operating lease right-of-use assets 430,525 91,329  
Deferred tax assets 43,126 34,157  
Restricted cash 49,905 29,508  
VAT recoverable 113,684 136,011  
Other non-current assets 115,315 75,873  
Total assets 6,581,324 5,147,059  
Current liabilities      
Amounts due to GDS Holdings and its non-VIE subsidiaries, net 2,531,025 1,534,768  
Total liabilities 6,361,362 5,025,104  
Net revenue, net income, operating, investing and financing cash flows      
Net revenue 5,453,802 4,013,561 2,712,875
Net (loss) income 129,254 99,857 (59,757)
Net cash provided by operating activities 899,132 414,424 739,848
Net cash used in investing activities (278,744) (201,995) (1,063,826)
Net cash provided by (used in) financing activities (20,682) (43,547) ¥ 614,575
VIEs | Accounts receivable      
Current liabilities      
Assets pledged 66,969 83,468  
VIEs | Property and equipment, net      
Current liabilities      
Assets pledged 102,248 114,344  
VIEs | Third party      
Current liabilities      
Short-term borrowings and current portion of long-term borrowings 628,721 493,614  
Accounts payable 194,325 181,448  
Accrued expenses and other payables 152,534 160,401  
Deferred revenue 90,192 68,003  
Operating lease liabilities, current 50,888 31,869  
Finance lease and other financing obligations, current 31,629 125,318  
Total current liabilities 1,148,289 1,060,653  
Long-term borrowings, excluding current portion 1,213,020 1,335,084  
Operating lease liabilities, non-current 361,502 66,387  
Finance lease and other financing obligations, non-current 982,209 921,965  
Deferred tax liabilities 91,036 76,297  
Other long-term liabilities 34,281 29,950  
Total liabilities ¥ 3,830,337 ¥ 3,490,336