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BANK AND OTHER BORROWINGS (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Instrument [Line Items] |
Schedule of Bank and Other Borrowings | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ | ​ | 2019 | ​ | 2020 | ​ | 2020
​ |  | RMB |  | RMB |  | US$
Total bank and other borrowings |  | 1,620,202 |  | 2,116,924 |  | 324,433
Comprised of: |  | ​ |  | ​ |  | ​
Short-term |  | 285,500 |  | 24,481 |  | 3,752
Long-term, current portion |  | 42,939 |  | 124,395 |  | 19,064
​ |  | 328,439 |  | 148,876 |  | 22,816
Long-term, non-current portion |  | 1,291,763 |  | 1,968,048 |  | 301,617
​ |  | 1,620,202 |  | 2,116,924 |  | 324,433
Long-term Bank and Other Borrowings [Member] |
Debt Instrument [Line Items] |
Schedule of Maturities of Long-Term and Other Debt | ​
​ | ​ | ​ | ​ | ​
​ |  | RMB |  | US$
Within one year |  | 124,395 |  | 19,064
Between one and two years |  | 172,131 |  | 26,381
Between two and three years |  | 248,715 |  | 38,117
Between three and four years |  | 445,079 |  | 68,211
Above four years |  | 1,102,123 |  | 168,908
​ |  | 2,092,443 |  | 320,681

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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