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Note 28 - Net Assets of Disposal Group Classified As Held for Sale - Components Gain on Sale After Income Tax for Disposals (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 20, 2017	Dec. 31, 2017	Dec. 31, 2016
Statement Line Items [Line Items]
Cash received		$ 331,295
Transaction and other costs		(3,663)
Carrying amount of net assets sold		(137,814)
Gain on sale before income tax		189,817
Income tax expense on gain		(100,123)
Gain on sale after income tax	$ 89,700	$ 89,694

X

- Definition

The gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation. [Refer: Discontinued operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2017-01-01
-Paragraph 33
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_33_b_iii&doctype=Standard
-URIDate 2017-03-09

+ Details

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Balance Type:	credit
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X

- Definition

The tax expense relating to the gain (loss) on discontinuance when operations are discontinued. [Refer: Discontinued operations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2017-01-01
-Paragraph 33
-Subparagraph b
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_33_b_iv&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2017-01-01
-Paragraph 81
-Subparagraph h
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_h_i&doctype=Standard
-URIDate 2017-03-09

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X

- Definition

The gross gain (loss) recognised on the measurement to fair value less costs to sell or on the disposal of the assets or disposal group(s) constituting the discontinued operation.

+ References

No definition available.

+ Details

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X

- Definition

The gross cash inflow from the disposal of non-current assets or disposal groups classified as held for sale and discontinued operations.

+ References

No definition available.

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X

- Definition

The amount of net assets sold during the period in a disposal at carrying value.

+ References

No definition available.

+ Details

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Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
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- References

No definition available.

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Namespace Prefix:	ts_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of transaction and other costs related to disposals of discontinued operations.

+ References

No definition available.

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