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Note 7 - Equity in Earnings (Losses) of Non-consolidated Companies (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of detailed information about equity method investments [text block] |
|  | Year ended December 31, |
(all amounts in thousands of U.S. dollars) |  | 2017 |  |  | 2016 |  |  | 2015 |
From non-consolidated companies |  |  | 116,140 |  |  |  | 71,533 |  |  |  | (10,674 | )
Impairment loss on non-consolidated companies (see Note 12) |  |  | - |  |  |  | - |  |  |  | (28,884 | )
|  |  | 116,140 |  |  |  | 71,533 |  |  |  | (39,558 | )

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- Definition The disclosure of detailed information about equity method investments. [Refer: Investments other than investments accounted for using equity method] + References No definition available. + Details
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Namespace Prefix: | ts_
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