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INCOME TAXES (Narrative) (Details) - CNY (¥) ¥ / shares in Units, ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Undistributed earnings |  | ¥ 937,735 | ¥ 604,218 |  |
Interest and penalty expenses |  | 0 | 0 | ¥ 0 |
Unrecognized tax benefits that would impact the income tax rate |  | 69,263 | 49,198 |  |
Unrecognized tax benefits |  | 69,822 | ¥ 53,404 | ¥ 36,921 | ¥ 18,764
Unrecognized tax benefits reasonably possible will be recognized |  | 66,122 |  |  |
Tax losses carry forwards |  | ¥ 39,936 |  |  |
PRC statutory income tax rate |  | 25.00% | 25.00% | 25.00% |
Income Taxes, Preferential Income Tax Rate Advanced and New Technology Enterprises |  | 15.00% | 15.00% | 15.00% | 15.00%
Income Taxes, Calculation Basis under Deemed Profit Method |  | income tax at 25% on its deemed profit which is calculated based on revenues less deemed expenses equal to 85% and 90% of revenues. |  |  |
Income Tax Examination, Open Years for Examination |  | 2012 to 2016 |  |  |
Deferred Income Tax Charge [Member] |  |  |  |  |
Unrecognized tax benefits |  | ¥ 3,457 | ¥ 7,215 |  |
Basic Earnings [Member] |  |  |  |  |
Per share effect of the tax holiday |  | ¥ 1.18 | ¥ 1.06 | ¥ 0.81 |
Diluted Earnings [Member] |  |  |  |  |
Per share effect of the tax holiday |  | ¥ 1.11 | ¥ 0.97 | ¥ 0.70 |
Income Tax Payable [Member] |  |  |  |  |
Unrecognized tax benefits |  | ¥ 62,665 | ¥ 42,489 |  |
Other Noncurrent Liabilities [Member] |  |  |  |  |
Unrecognized tax benefits |  | ¥ 3,700 | ¥ 3,700 |  |
Computational Errors [Member] |  |  |  |  |
Income Tax Examination, Statute of Limitation |  | 3 years |  |  |
Underpayment of Taxes is More Than RMB100 [Member] |  |  |  |  |
Income Tax Examination, Statute of Limitation |  | 5 years |  |  |
Transfer Pricing [Member] |  |  |  |  |
Income Tax Examination, Statute of Limitation |  | 10 years |  |  |
State Administration of Taxation, China [Member] |  |  |  |  |
Withholding Tax Percentage On Repatriated Earnings |  | 10.00% |  |  |
Maximum [Member] |  |  |  |  |
Income Taxes, Preferential Income Tax Rate Small Profit Enterprises |  | 20.00% |  |  |
Tarena Hangzhou [Member] |  |  |  |  |
PRC statutory income tax rate |  | 12.50% |  |  |
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent |  | 50.00% |  |  |
Hanru Education Technology Co., Ltd [Member] | Scenario, Forecast [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent | 50.00% |  |  |  |
2018 [Member] |  |  |  |  |
Tax losses carry forwards |  | ¥ 227 |  |  |
2019 [Member] |  |  |  |  |
Tax losses carry forwards |  | 11,053 |  |  |
2020 [Member] |  |  |  |  |
Tax losses carry forwards |  | 8,165 |  |  |
2021 [Member] |  |  |  |  |
Tax losses carry forwards |  | ¥ 20,491 |  |  |

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