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Note 17 - Trade Receivables - Summary of the Aging of Trade Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Statement Line Items [Line Items] |  |
Guaranteed | $ 247,079 | $ 355,508
Not guaranteed | 1,045,366 | 684,901
| 1,292,445 | 1,040,409
Allowance for doubtful accounts (see Note 23 (i)) | (78,385) | (85,724)
Net Value | 1,214,060 | 954,685
Current trade receivables, not due [member] |  |
Statement Line Items [Line Items] |  |
Guaranteed | 219,764 | 272,393
Not guaranteed | 841,737 | 518,984
| 1,061,501 | 791,377
Allowance for doubtful accounts (see Note 23 (i)) |  | (62)
Net Value | 1,061,501 | 791,315
Current trade receivables, past due, less than 180 days [member] |  |
Statement Line Items [Line Items] |  |
Guaranteed | 22,978 | 32,241
Not guaranteed | 115,245 | 87,379
| 138,223 | 119,620
Allowance for doubtful accounts (see Note 23 (i)) |  | (67)
Net Value | 138,223 | 119,553
Current trade receivables, past due, greater than 180 days [member] |  |
Statement Line Items [Line Items] |  |
Guaranteed | 4,337 | 50,874
Not guaranteed | 88,384 | 78,538
| 92,721 | 129,412
Allowance for doubtful accounts (see Note 23 (i)) | (78,385) | (85,595)
Net Value | $ 14,336 | $ 43,817

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- Definition The amount of current trade receivables. [Refer: Trade receivables] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 68 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_68&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Represents a valuation allowance for trade receivables due to an Entity within one year (or one operating cycle if longer) that are expected to be uncollectible. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The gross amount of current trade receivables. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount current trade receivables that are guaranteed. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the amount of current trade receivables that are not guaranteed. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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- Details
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- Details
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- Details
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