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Note 30 - Principal Subsidiaries (Details Textual)	12 Months Ended
	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%

X

- 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

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- References

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- Details

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- Details

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- Details

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