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Note 29 - Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of transactions between related parties [text block] |
(all amounts in thousands of U.S. dollars) |  | Year ended December 31,
|  | 2017 |  | 2016 |  | 2015
(i) Transactions |  |  |  |  |  |  |  |  |  |  |  |
(a) Sales of goods and services |  |  |  |  |  |  |  |  |  |  |  |
Sales of goods to non-consolidated parties |  |  | 32,362 |  |  |  | 21,174 |  |  |  | 24,019 |
Sales of goods to other related parties |  |  | 94,624 |  |  |  | 32,613 |  |  |  | 87,663 |
Sales of services to non-consolidated parties |  |  | 11,637 |  |  |  | 9,542 |  |  |  | 10,154 |
Sales of services to other related parties |  |  | 3,751 |  |  |  | 2,948 |  |  |  | 4,010 |
|  |  | 142,374 |  |  |  | 66,277 |  |  |  | 125,846 |
(b) Purchases of goods and services |  |  |  |  |  |  |  |  |  |  |  |
Purchases of goods to non-consolidated parties |  |  | 234,361 |  |  |  | 67,048 |  |  |  | 260,280 |
Purchases of goods to other related parties |  |  | 17,711 |  |  |  | 20,150 |  |  |  | 35,153 |
Purchases of services to non-consolidated parties |  |  | 12,077 |  |  |  | 11,528 |  |  |  | 16,153 |
Purchases of services to other related parties |  |  | 50,794 |  |  |  | 53,530 |  |  |  | 78,805 |
|  |  | 314,943 |  |  |  | 152,256 |  |  |  | 390,391 |
(all amounts in thousands of U.S. dollars) |  | At December 31,
|  | 2017 |  | 2016
(ii) Period-end balances |  |  |  |  |  |  |  |
(a) Arising from sales / purchases of goods / services |  |  |  |  |  |  |  |
Receivables from non-consolidated parties |  |  | 117,853 |  |  |  | 117,187 |
Receivables from other related parties |  |  | 50,815 |  |  |  | 13,357 |
Payables to non-consolidated parties |  |  | (49,354 | ) |  |  | (21,314 | )
Payables to other related parties |  |  | (14,475 | ) |  |  | (12,708 | )
|  |  | 104,839 |  |  |  | 96,522 |

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- Definition The disclosure of transactions between the entity and its related parties. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 18 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_18&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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