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Note 33 - Nationalization of Venezuelan Subsidiaries (Details Textual) - USD ($) $ in Thousands			12 Months Ended
	Dec. 12, 2016	Jan. 29, 2016	Dec. 31, 2019	Dec. 31, 2018
Statement Line Items [Line Items]
Total trade and other non-current receivables			$ 157,103	$ 151,905
VENEZUELA
Statement Line Items [Line Items]
Total trade and other non-current receivables			49,000
Matesi Materiales Siderúrgicos S.A [member] | VENEZUELA
Statement Line Items [Line Items]
Nationalization of subsidiaries, compensation award not including pre-award interest		$ 87,300
Nationalization of subsidiaries, pre-award interest		85,500
Nationalization of subsidiaries, compensation award including pre-award interest		$ 172,800
Nationalization of subsidiaries, post-award interest rate		9.00%
Nationalization of subsidiaries, compensation award post-award interest			71,000
Tavsa and Comsigua [member] | VENEZUELA
Statement Line Items [Line Items]
Nationalization of subsidiaries, compensation award including pre-award interest	$ 137,000
Nationalization of subsidiaries, reimbursement of legal fees	$ 3,300
Nationalization of subsidiaries, basis spread on variable rate	4.00%
Interest receivable			$ 118,000

X

- Definition

The amount of interest recognised as a receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_InterestReceivable
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of non-current trade receivables and non-current other receivables. [Refer: Non-current trade receivables; Other non-current receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_h&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2019-03-27

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the interest receivable associated with the nationalization of subsidiaries.

+ References

No definition available.

+ Details

Name:	ts_NationalizationOfSubsidiariesBasisSpreadOnVariableRate
Namespace Prefix:	ts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount awarded, including pre-award interest, as compensation for the nationalization of subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount awarded, not including pre-award interest, as compensation for the nationalization of subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of post-award interest for compensation for the nationalization of subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The rate at which interest will accrue if compensation for the nationalization of subsidiaries is not received by the due date.

+ References

No definition available.

+ Details

Name:	ts_NationalizationOfSubsidiariesPostawardInterestRate
Namespace Prefix:	ts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of pre-award interest associated with compensation for the nationalization of subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of reimbursement of legal fees associated with the nationalization of subsidiaries.

+ References

No definition available.

+ Details

Name:	ts_NationalizationOfSubsidiariesReimbursementOfLegalFees
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ts_StatementLineItems
Namespace Prefix:	ts_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: