Represents the open years for income tax examination

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Represents the statute of limitation of china subsidiaries for underpayment of taxes.

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Represents the basis for calculating income tax under the deemed profit method for certain locations in china.

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No definition available.

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Represents the percentage of preferential income tax rate applicable to the entities that qualify as “Advanced and New Technology Enterprise” (“ANTE”).

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No definition available.

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Represents the percentage of preferential income tax rate applicable to the subsidiaries and branches qualified as "Small Profit Enterprises".

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The CIT Law and its implementation rules impose a withholding income tax at 10%, unless reduced by a tax treaty or arrangement, on the amount of dividends distributed by a PRC-resident enterprise to its immediate holding company outside the PRC

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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Amount of unrecognized tax benefits.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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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