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BANK AND OTHER BORROWINGS (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Instrument [Line Items] |
Schedule of Bank and Other Borrowings | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ | ​ | 2020 | ​ | 2021 | ​ | 2021
​ |  | RMB |  | RMB |  | US$
Total bank and other borrowings |  | 2,116,924 |  | 2,477,948 |  | 388,844
Comprised of: |  | ​ |  | ​ |  | ​
Short-term |  | 24,481 |  | 136,510 |  | 21,421
Long-term, current portion |  | 124,395 |  | 162,842 |  | 25,553
​ |  | 148,876 |  | 299,352 |  | 46,974
Long-term, non-current portion |  | 1,968,048 |  | 2,178,596 |  | 341,870
​ |  | 2,116,924 |  | 2,477,948 |  | 388,844
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 |  | 162,842 |  | 25,553
Between one and two years |  | 253,016 |  | 39,704
Between two and three years |  | 447,604 |  | 70,239
Between three and four years |  | 493,452 |  | 77,433
Above four years |  | 984,524 |  | 154,494
​ |  | 2,341,438 |  | 367,423

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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=123465755&loc=d3e1835-112601 + Details
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