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Note 25 - Contingencies, Commitments and Restrictions On the Distribution of Profits (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement Line Items [Line Items] |
Disclosure of detailed information about equity if different from the financial statements [text block] |
(all amounts in thousands of U.S. dollars) |  |  |
Share capital |  |  | 1,180,537 |
Legal reserve |  |  | 118,054 |
Share premium |  |  | 609,733 |
Retained earnings including net income for the year ended December 31, 2017 |  |  | 16,956,761 |
Total equity in accordance with Luxembourg law |  |  | 18,865,085 |
Disclosure of detailed information about distributable retained earnings [text block] |
(all amounts in thousands of U.S. dollars) |  |  |
Retained earnings at December 31, 2016 under Luxembourg law |  |  | 17,493,013 |
Other income and expenses for the year ended December 31, 2017 |  |  | (52,232 | )
Dividends approved |  |  | (484,020 | )
Retained earnings at December 31, 2017 under Luxembourg law |  |  | 16,956,761 |
Share premium |  |  | 609,733 |
Distributable amount at December 31, 2017 under Luxembourg law |  |  | 17,566,494 |

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- Definition The disclosure of detailed information about distributable retained earnings. + 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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- Definition The disclosure of detailed information about equity if different from the financial statements. + 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