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Consolidated Statement of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Income for the year $ 873,900 $ 536,389 $ 58,739
Items that may be subsequently reclassified to profit or loss:      
Currency translation adjustment (96,916) 151,762 37,187
Change in value of cash flow hedges and instruments at fair value (6,701) 4,502 (7,525)
Income tax relating to components of other comprehensive income 34 23 (23)
- Currency translation adjustment (*) [1] 1,848 (9,548) 3,473
- Changes in the fair value of derivatives held as cash flow hedges and others (132) 512 421
(101,867) 147,251 33,533
Items that will not be reclassified to profit or loss:      
Remeasurements of post employment benefit obligations 7,963 (8,635) (230)
Income tax on items that will not be reclassified (1,932) 1,338 (1,760)
Remeasurements of post employment benefit obligations of non-consolidated companies (3,855) (376) (5,475)
2,176 (7,673) (7,465)
Other comprehensive (loss) income for the year, net of tax (99,691) 139,578 26,068
Total comprehensive income for the year 774,209 675,967 84,807
Total comprehensive income (loss) for the year attributable to:      
Owners of the parent 776,713 683,531 81,702
Non-controlling interests (2,504) (7,564) 3,105
Total comprehensive income (loss) for the year 774,209 675,967 84,807
Total comprehensive income (loss) for the year attributable to Owners of the parent arises from      
Continuing operations 776,713 591,989 40,291
Discontinued operations 91,542 41,411
$ 776,713 $ 683,531 $ 81,702
[1] Tenaris recognized its share over the effects on the adoption of IAS 29, "Financial Reporting in Hyperinflationary Economies" by Ternium ($49.3 million) in other comprehensive income as a currency translation adjustment.