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TAXATION (Narrative) (Details) - CNY (¥) ¥ in Thousands | 8 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits that if recognized would affect the annual effective tax rate | ¥ 1,675 | ¥ 2,042 | ¥ 5,941 | ¥ 1,675
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 25.00% | 25.00% | 25.00%
Minimum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
VAT (as a percent) | 3.00% |  |  |
Business tax (as a percent) | 3.00% | 3.00% |  |
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
VAT (as a percent) | 6.00% |  |  |
Business tax (as a percent) | 5.00% | 5.00% |  |
China [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
VAT payable |  | ¥ 8,973 | ¥ 8,965 |
Business tax payable |  | ¥ 18,430 | ¥ 18,423 |
Withholding income tax on dividends distributed by an FIE to its immediate holding company outside China (as a percent) |  | 10.00% |  |
Lower withholding income tax on dividends distributed by an FIE to its immediate holding company registered in Hong Kong or other jurisdiction that have a tax treaty or arrangement with China (as a percent) |  | 5.00% |  |
Income tax rate for schools in certain cities registered as requiring reasonable returns (as a percent) |  | 25.00% |  |
China [Member] | Minimum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
VAT (as a percent) |  | 3.00% |  |
Business tax (as a percent) |  | 3.00% |  |
Income tax rate for schools in certain cities registered as requiring reasonable returns (as a percent) |  | 1.50% |  |
China [Member] | Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
VAT (as a percent) |  | 6.00% |  |
Business tax (as a percent) |  | 5.00% |  |
Income tax rate for schools in certain cities registered as requiring reasonable returns (as a percent) |  | 2.50% |  |
Hong Kong [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax rate (as a percent) |  | 16.50% |  |
Taiwan |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax rate (as a percent) |  | 17.00% |  |
Domestic Tax Authority [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 35.00% |
Private schools or colleges [Member] | China [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax rate for schools in certain cities registered as requiring reasonable returns (as a percent) |  | 25.00% |  |

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