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Note 19 - Borrowings - Borrowings Evolution (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Statement Line Items [Line Items] |
At the beginning of the year, noncurrent | $ 31,542
Translation differences, noncurrent | 1,649
Proceeds and repayments, net, noncurrent | 1,510
Interests Accrued less payments, noncurrent | (19)
Reclassifications, noncurrent | (309)
Other Movements, noncurrent | 272
Overdrafts variation, noncurrent |
At the end of the year, noncurrent | 34,645
At the beginning of the year, current | 808,694
Translation differences, current | (3,622)
Proceeds and repayments, net, current | 105,142
Interests Accrued less payments, current | 21,880
Reclassifications, current | 309
Other Movements, current |
Overdrafts variation, current | (1,189)
At the end of the year, current | $ 931,214

X
- Definition The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings] + 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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + 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
Name: | ifrs-full_LongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in the non-current portion of non-current borrowings resulting from interests accrued net of payments. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the non-current portion of non-current borrowings resulting from interests accrued net of payments. + References No definition available. + Details
Name: | ts_EffectOfInterestsAccruedNetOfPaymentsOnLongtermBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the total current borrowings and current portion of non-current borrowings resulting from net proceeds and repayments. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the non-current portion of non-current borrowings resulting from net proceeds and repayments. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the total current borrowings and current portion of non-current borrowings resulting from other movements. + References No definition available. + Details
Name: | ts_EffectOfOtherMovementsOnCurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the non-current portion of non-current borrowings resulting from other movements. + References No definition available. + Details
Name: | ts_EffectOfOtherMovementsOnLongtermBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the current borrowings and current portion of non-current borrowings resulting from overdrafts variation. + References No definition available. + Details
Name: | ts_EffectOfOverdraftsVariationOnCurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the non-current portion of non-current borrowings resulting from overdrafts variation. + References No definition available. + Details
Name: | ts_EffectOfOverdraftsVariationOnLongtermBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the total current borrowings and current portion of non-current borrowings resulting from reclassifications. + References No definition available. + Details
Name: | ts_EffectOfReclassificationsOnCurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the non-current portion of non-current borrowings resulting from reclassifications. + References No definition available. + Details
Name: | ts_EffectOfReclassificationsOnLongtermBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the current borrowings and current portion of non-current borrowings resulting from translation differences. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in the non-current portion of non-current borrowings resulting from translation differences. + References No definition available. + Details
Name: | ts_EffectOfTranslationDifferencesOnLongtermBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ts_StatementLineItems
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration