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Document And Entity Information
 12 Months Ended
Dec. 31, 2017
shares
Document Information [Line Items]  
Entity Registrant Name Tenaris SA
Entity Central Index Key 0001190723
Trading Symbol ts
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Entity Current Reporting Status Yes
Entity Voluntary Filers No
Entity Well-known Seasoned Issuer No
Entity Common Stock, Shares Outstanding (in shares) 1,180,536,830
Document Type 20-F
Document Period End Date Dec. 31, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus FY
Amendment Flag false