<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.8.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>280</ContextCount>
  <ElementCount>375</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>96</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>101 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>102 - Statement - CONSOLIDATED BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ConsolidatedBalanceSheets</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>103 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>CONSOLIDATED BALANCE SHEETS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>104 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>105 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ConsolidatedStatementsOfComprehensiveIncomeParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>106 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ConsolidatedStatementsOfChangesInEquity</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>107 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ConsolidatedStatementsOfChangesInEquityParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>108 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>109 - Disclosure - DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/DescriptionOfBusinessOrganizationBasisOfPresentationAndSignificantConcentrationsAndRisks</Role>
      <ShortName>DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>110 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>111 - Disclosure - ACCOUNTS RECEIVABLE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccountsReceivable</Role>
      <ShortName>ACCOUNTS RECEIVABLE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>112 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/PrepaidExpensesAndOtherCurrentAssets</Role>
      <ShortName>PREPAID EXPENSES AND OTHER CURRENT ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>113 - Disclosure - PROPERTY AND EQUIPMENT, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/PropertyAndEquipmentNet</Role>
      <ShortName>PROPERTY AND EQUIPMENT, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>114 - Disclosure - LONG-TERM INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/LongtermInvestments</Role>
      <ShortName>LONG-TERM INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>115 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccruedExpensesAndOtherCurrentLiabilities</Role>
      <ShortName>ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>116 - Disclosure - NET REVENUES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/NetRevenues</Role>
      <ShortName>NET REVENUES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>117 - Disclosure - LOSS ON FOREIGN CURRENCY FORWARD CONTRACT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/LossOnForeignCurrencyForwardContract</Role>
      <ShortName>LOSS ON FOREIGN CURRENCY FORWARD CONTRACT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>118 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxes</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>119 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/RelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>120 - Disclosure - ORDINARY SHARES AND STATUTORY RESERVE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/OrdinarySharesAndStatutoryReserve</Role>
      <ShortName>ORDINARY SHARES AND STATUTORY RESERVE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>121 - Disclosure - SHARE BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ShareBasedCompensation</Role>
      <ShortName>SHARE BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>122 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/EarningsPerShare</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>123 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/CommitmentsAndContingencies</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>124 - Disclosure - PARENT ONLY FINANCIAL INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ParentOnlyFinancialInformation</Role>
      <ShortName>PARENT ONLY FINANCIAL INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>125 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/SubsequentEvents</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>126 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>127 - Disclosure - DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/DescriptionOfBusinessOrganizationBasisOfPresentationAndSignificantConcentrationsAndRisksTables</Role>
      <ShortName>DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/DescriptionOfBusinessOrganizationBasisOfPresentationAndSignificantConcentrationsAndRisks</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>128 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>129 - Disclosure - ACCOUNTS RECEIVABLE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccountsReceivableTables</Role>
      <ShortName>ACCOUNTS RECEIVABLE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/AccountsReceivable</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>130 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/PrepaidExpensesAndOtherCurrentAssetsTables</Role>
      <ShortName>PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/PrepaidExpensesAndOtherCurrentAssets</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>131 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/PropertyAndEquipmentNetTables</Role>
      <ShortName>PROPERTY AND EQUIPMENT, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/PropertyAndEquipmentNet</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>132 - Disclosure - LONG-TERM INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/LongtermInvestmentsTables</Role>
      <ShortName>LONG-TERM INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/LongtermInvestments</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>133 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccruedExpensesAndOtherCurrentLiabilitiesTables</Role>
      <ShortName>ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/AccruedExpensesAndOtherCurrentLiabilities</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>134 - Disclosure - NET REVENUES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/NetRevenuesTables</Role>
      <ShortName>NET REVENUES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/NetRevenues</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>135 - Disclosure - INCOME TAXES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxesTables</Role>
      <ShortName>INCOME TAXES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/IncomeTaxes</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>136 - Disclosure - RELATED PARTY TRANSACTIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/RelatedPartyTransactionsTables</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/RelatedPartyTransactions</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>137 - Disclosure - SHARE BASED COMPENSATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ShareBasedCompensationTables</Role>
      <ShortName>SHARE BASED COMPENSATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ShareBasedCompensation</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>138 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/EarningsPerShareTables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/EarningsPerShare</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>139 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/CommitmentsAndContingenciesTables</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/CommitmentsAndContingencies</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>140 - Disclosure - PARENT ONLY FINANCIAL INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ParentOnlyFinancialInformationTables</Role>
      <ShortName>PARENT ONLY FINANCIAL INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ParentOnlyFinancialInformation</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>141 - Disclosure - DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Organization) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/DescriptionOfBusinessOrganizationBasisOfPresentationAndSignificantConcentrationsAndRisksOrganizationDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Organization) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/DescriptionOfBusinessOrganizationBasisOfPresentationAndSignificantConcentrationsAndRisksTables</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>142 - Disclosure - DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Significant Concentrations and Risks) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/DescriptionOfBusinessOrganizationBasisOfPresentationAndSignificantConcentrationsAndRisksSignificantConcentrationsAndRisksDetails</Role>
      <ShortName>DESCRIPTION OF BUSINESS, ORGANIZATION, BASIS OF PRESENTATION AND SIGNIFICANT CONCENTRATIONS AND RISKS (Significant Concentrations and Risks) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/DescriptionOfBusinessOrganizationBasisOfPresentationAndSignificantConcentrationsAndRisksTables</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>143 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/SummaryOfSignificantAccountingPoliciesDetails</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/SummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>144 - Disclosure - ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccountsReceivableScheduleOfAccountsReceivableDetails</Role>
      <ShortName>ACCOUNTS RECEIVABLE (Schedule of Accounts Receivable) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/AccountsReceivableTables</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>145 - Disclosure - ACCOUNTS RECEIVABLE (Classification of Accounts Receivable) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccountsReceivableClassificationOfAccountsReceivableDetails</Role>
      <ShortName>ACCOUNTS RECEIVABLE (Classification of Accounts Receivable) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/AccountsReceivableTables</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>146 - Disclosure - ACCOUNTS RECEIVABLE (Summary of Allowance for Doubtful Accounts) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccountsReceivableSummaryOfAllowanceForDoubtfulAccountsDetails</Role>
      <ShortName>ACCOUNTS RECEIVABLE (Summary of Allowance for Doubtful Accounts) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/AccountsReceivableTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>147 - Disclosure - ACCOUNTS RECEIVABLE (Schedule of Aging Accounts Receivable) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccountsReceivableScheduleOfAgingAccountsReceivableDetails</Role>
      <ShortName>ACCOUNTS RECEIVABLE (Schedule of Aging Accounts Receivable) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/AccountsReceivableTables</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>148 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/PrepaidExpensesAndOtherCurrentAssetsDetails</Role>
      <ShortName>PREPAID EXPENSES AND OTHER CURRENT ASSETS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/PrepaidExpensesAndOtherCurrentAssetsTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>149 - Disclosure - PROPERTY AND EQUIPMENT, NET (Schedule of Property and Equipment) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/PropertyAndEquipmentNetScheduleOfPropertyAndEquipmentDetails</Role>
      <ShortName>PROPERTY AND EQUIPMENT, NET (Schedule of Property and Equipment) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/PropertyAndEquipmentNetTables</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>150 - Disclosure - PROPERTY AND EQUIPMENT, NET (Schedule of Depreciation Expense) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/PropertyAndEquipmentNetScheduleOfDepreciationExpenseDetails</Role>
      <ShortName>PROPERTY AND EQUIPMENT, NET (Schedule of Depreciation Expense) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/PropertyAndEquipmentNetTables</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>151 - Disclosure - LONG-TERM INVESTMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/LongtermInvestmentsDetails</Role>
      <ShortName>LONG-TERM INVESTMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/LongtermInvestmentsTables</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>152 - Disclosure - LONG-TERM INVESTMENTS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/LongtermInvestmentsNarrativeDetails</Role>
      <ShortName>LONG-TERM INVESTMENTS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/LongtermInvestmentsTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>153 - Disclosure - ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/AccruedExpensesAndOtherCurrentLiabilitiesDetails</Role>
      <ShortName>ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/AccruedExpensesAndOtherCurrentLiabilitiesTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>154 - Disclosure - NET REVENUES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/NetRevenuesDetails</Role>
      <ShortName>NET REVENUES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/NetRevenuesTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>155 - Disclosure - LOSS ON FOREIGN CURRENCY FORWARD CONTRACT (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/LossOnForeignCurrencyForwardContractNarrativeDetails</Role>
      <ShortName>LOSS ON FOREIGN CURRENCY FORWARD CONTRACT (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/LossOnForeignCurrencyForwardContract</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>156 - Disclosure - INCOME TAXES (Schedule of Income before Income Taxes) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxesScheduleOfIncomeBeforeIncomeTaxesDetails</Role>
      <ShortName>INCOME TAXES (Schedule of Income before Income Taxes) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/IncomeTaxesTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>157 - Disclosure - INCOME TAXES (Schedule of Income Tax Expenses) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxesScheduleOfIncomeTaxExpensesDetails</Role>
      <ShortName>INCOME TAXES (Schedule of Income Tax Expenses) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/IncomeTaxesTables</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>158 - Disclosure - INCOME TAXES (Schedule of Income Tax Rate Reconciliation) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxesScheduleOfIncomeTaxRateReconciliationDetails</Role>
      <ShortName>INCOME TAXES (Schedule of Income Tax Rate Reconciliation) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/IncomeTaxesTables</ParentRole>
      <Position>58</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>159 - Disclosure - INCOME TAXES (Schedule of Deferred Income Tax Assets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxesScheduleOfDeferredIncomeTaxAssetsDetails</Role>
      <ShortName>INCOME TAXES (Schedule of Deferred Income Tax Assets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/IncomeTaxesTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>160 - Disclosure - INCOME TAXES (Summary of Valuation Allowance) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxesSummaryOfValuationAllowanceDetails</Role>
      <ShortName>INCOME TAXES (Summary of Valuation Allowance) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/IncomeTaxesTables</ParentRole>
      <Position>60</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>161 - Disclosure - INCOME TAXES (Schedule of Unrecognized Tax Benefits) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxesScheduleOfUnrecognizedTaxBenefitsDetails</Role>
      <ShortName>INCOME TAXES (Schedule of Unrecognized Tax Benefits) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/IncomeTaxesTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>162 - Disclosure - INCOME TAXES (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/IncomeTaxesNarrativeDetails</Role>
      <ShortName>INCOME TAXES (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/IncomeTaxesTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>163 - Disclosure - RELATED PARTY TRANSACTIONS (Schedule of Related Party Transactions) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/RelatedPartyTransactionsScheduleOfRelatedPartyTransactionsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Schedule of Related Party Transactions) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/RelatedPartyTransactionsTables</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>164 - Disclosure - RELATED PARTY TRANSACTIONS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/RelatedPartyTransactionsNarrativeDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/RelatedPartyTransactionsTables</ParentRole>
      <Position>64</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>165 - Disclosure - ORDINARY SHARES AND STATUTORY RESERVE (Ordinary Shares) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/OrdinarySharesAndStatutoryReserveOrdinarySharesDetails</Role>
      <ShortName>ORDINARY SHARES AND STATUTORY RESERVE (Ordinary Shares) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/OrdinarySharesAndStatutoryReserve</ParentRole>
      <Position>65</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>166 - Disclosure - ORDINARY SHARES AND STATUTORY RESERVE (Statutory Reserve) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/OrdinarySharesAndStatutoryReserveStatutoryReserveDetails</Role>
      <ShortName>ORDINARY SHARES AND STATUTORY RESERVE (Statutory Reserve) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/OrdinarySharesAndStatutoryReserve</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>167 - Disclosure - SHARE BASED COMPENSATION (Summary of Stock Option Activity) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ShareBasedCompensationSummaryOfStockOptionActivityDetails</Role>
      <ShortName>SHARE BASED COMPENSATION (Summary of Stock Option Activity) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ShareBasedCompensationTables</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>168 - Disclosure - SHARE BASED COMPENSATION (Summary of Fair Value Assumptions) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ShareBasedCompensationSummaryOfFairValueAssumptionsDetails</Role>
      <ShortName>SHARE BASED COMPENSATION (Summary of Fair Value Assumptions) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ShareBasedCompensationTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>169 - Disclosure - SHARE BASED COMPENSATION (Schedule of Fair Value of the Options Granted) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ShareBasedCompensationScheduleOfFairValueOfOptionsGrantedDetails</Role>
      <ShortName>SHARE BASED COMPENSATION (Schedule of Fair Value of the Options Granted) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ShareBasedCompensationTables</ParentRole>
      <Position>69</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>170 - Disclosure - SHARE BASED COMPENSATION (Summary of Non-vested Shares Activity) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ShareBasedCompensationSummaryOfNonvestedSharesActivityDetails</Role>
      <ShortName>SHARE BASED COMPENSATION (Summary of Non-vested Shares Activity) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ShareBasedCompensationTables</ParentRole>
      <Position>70</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>171 - Disclosure - SHARE BASED COMPENSATION (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ShareBasedCompensationNarrativeDetails</Role>
      <ShortName>SHARE BASED COMPENSATION (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ShareBasedCompensationTables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>172 - Disclosure - EARNINGS PER SHARE (Schedule of Basic and Diluted Earnings Per Share) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/EarningsPerShareScheduleOfBasicAndDilutedEarningsPerShareDetails</Role>
      <ShortName>EARNINGS PER SHARE (Schedule of Basic and Diluted Earnings Per Share) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/EarningsPerShareTables</ParentRole>
      <Position>72</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>173 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/CommitmentsAndContingenciesDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/CommitmentsAndContingenciesTables</ParentRole>
      <Position>73</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>174 - Disclosure - PARENT ONLY FINANCIAL INFORMATION (Condensed Balance Sheets) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ParentOnlyFinancialInformationCondensedBalanceSheetsDetails</Role>
      <ShortName>PARENT ONLY FINANCIAL INFORMATION (Condensed Balance Sheets) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ParentOnlyFinancialInformationTables</ParentRole>
      <Position>74</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>175 - Disclosure - PARENT ONLY FINANCIAL INFORMATION (Condensed Statements of Comprehensive Income) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ParentOnlyFinancialInformationCondensedStatementsOfComprehensiveIncomeDetails</Role>
      <ShortName>PARENT ONLY FINANCIAL INFORMATION (Condensed Statements of Comprehensive Income) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ParentOnlyFinancialInformationTables</ParentRole>
      <Position>75</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>176 - Disclosure - PARENT ONLY FINANCIAL INFORMATION (Condensed Statements of Cash Flows) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/ParentOnlyFinancialInformationCondensedStatementsOfCashFlowsDetails</Role>
      <ShortName>PARENT ONLY FINANCIAL INFORMATION (Condensed Statements of Cash Flows) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/ParentOnlyFinancialInformationTables</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="tedu-20171231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>177 - Disclosure - SUBSEQUENT EVENTS (Narrative) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bj.tedu.cn/role/SubsequentEventsNarrativeDetails</Role>
      <ShortName>SUBSEQUENT EVENTS (Narrative) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bj.tedu.cn/role/SubsequentEvents</ParentRole>
      <Position>77</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>tedu-20171231.xml</File>
    <File>tedu-20171231.xsd</File>
    <File>tedu-20171231_cal.xml</File>
    <File>tedu-20171231_def.xml</File>
    <File>tedu-20171231_lab.xml</File>
    <File>tedu-20171231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/country/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2014-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/invest/2013-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/currency/2017-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
