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Note 30 - Principal Subsidiaries (Details Textual) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
HYDRIL COMPANY and subsidiaries [member] |  |  |
Statement Line Items [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 100.00% |  |
Technical Drilling & Production Services Nigeria. Ltd [member] |  |  |
Statement Line Items [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 80.00% | 80.00% | 80.00%
Tenaris Supply Chain S.A. [member] |  |  |
Statement Line Items [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 97.50% |  |
Gepnaris S.A. [member] |  |  |
Statement Line Items [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 60.00% |  |
Tubular Technical Services and Pipe Coaters [member] |  |  |
Statement Line Items [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 40.00% |  |
Amaja Tubular Services Limited [member] |  |  |
Statement Line Items [Line Items] |  |  |
Proportion of ownership interest in subsidiary | 49.00% |  |

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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_c&doctype=Standard -URIDate 2017-03-09 + Details
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- References No definition available. + Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
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- Details
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- Details
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- Details
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