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CASH, CASH EQUIVALENTS AND OTHER INVESTMENTS - NON CURRENT AND CURRENT (Other investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Cash, cash equivalents and other investments [Abstract] |  |
Investments in companies under cost method | $ 252 | $ 0
Investments in debt instruments | 3,128 | 5,998
Other investments, net – Non-current | $ 3,380 | $ 5,998

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- Definition The amount of instruments representing indebtedness held by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Cash, cash equivalents and other investments [Abstract] + References No definition available. + Details
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- Definition Investments in companies under cost method + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other investments, net, noncurrent + References No definition available. + Details
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Namespace Prefix: | tx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant