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INCOME TAXES (Summary of Valuation Allowance) (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Balance at the beginning of the year | ¥ 20,115 | ¥ 14,362 | ¥ 3,647
Additions of valuation allowance | 13,076 | 9,069 | 11,198
Reduction of valuation allowance | (6,684) | (3,316) | (483)
Balance at the end of the year | ¥ 26,507 | ¥ 20,115 | ¥ 14,362

X
- Definition Amount of increase in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | tedu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of decrease in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | tedu_ValuationAllowanceDeferredTaxAssetReductions
Namespace Prefix: | tedu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant