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Note 10 - Property, Plant and Equipment, Net - Components of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | $ 6,090,017 |  | $ 6,063,908 |
End of the year | 6,193,181 |  | 6,090,017 |
Land and civil buildings [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 677,671 |  |  |
End of the year | 707,126 |  | 677,671 |
Industrial buildings, plant and production equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 5,166,678 |  |  |
End of the year | 5,249,425 |  | 5,166,678 |
Vehicles, furniture and fixtures [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 76,758 |  |  |
End of the year | 72,511 |  | 76,758 |
Construction in progress [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 108,308 |  |  |
End of the year | 102,226 |  | 108,308 |
Spare parts and equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 60,602 |  |  |
End of the year | 61,893 |  | 60,602 |
Gross carrying amount [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 13,836,586 |  | 13,421,982 |
Translation differences | 70,291 |  | (43,307) |
Increase due to business combinations | 503,438 | [1] | 178,739 | [2]
Additions | 167,755 |  | 313,915 |
Disposals / Consumptions | (82,416) |  | (38,975) |
Transfers / Reclassifications | 2,351 |  | 4,232 |
End of the year | 14,498,005 |  | 13,836,586 |
Gross carrying amount [member] | Land and civil buildings [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 799,139 |  | 732,578 |
Translation differences | (545) |  | (1,611) |
Increase due to business combinations | 39,622 | [1] | 59,468 | [2]
Additions | 1,451 |  | 16 |
Disposals / Consumptions | (5,964) |  | (35) |
Transfers / Reclassifications | 5,881 |  | 8,723 |
End of the year | 839,584 |  | 799,139 |
Gross carrying amount [member] | Industrial buildings, plant and production equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 12,468,813 |  | 12,121,569 |
Translation differences | 72,650 |  | (38,961) |
Increase due to business combinations | 440,366 | [1] | 115,908 | [2]
Additions | 1,524 |  | 1,178 |
Disposals / Consumptions | (61,281) |  | (27,153) |
Transfers / Reclassifications | 157,473 |  | 296,272 |
End of the year | 13,079,545 |  | 12,468,813 |
Gross carrying amount [member] | Vehicles, furniture and fixtures [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 399,724 |  | 377,260 |
Translation differences | 443 |  | (1,615) |
Increase due to business combinations | 7,195 | [1] | 1,733 | [2]
Additions | 620 |  | 1,107 |
Disposals / Consumptions | (8,811) |  | (7,110) |
Transfers / Reclassifications | 15,586 |  | 28,349 |
End of the year | 414,757 |  | 399,724 |
Gross carrying amount [member] | Construction in progress [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 108,308 |  | 127,378 |
Translation differences | (2,095) |  | (864) |
Increase due to business combinations | 16,255 | [1] | 1,630 | [2]
Additions | 157,315 |  | 299,412 |
Disposals / Consumptions | (968) |  | (2,120) |
Transfers / Reclassifications | (176,589) |  | (317,128) |
End of the year | 102,226 |  | 108,308 |
Gross carrying amount [member] | Spare parts and equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 60,602 |  | 63,197 |
Translation differences | (162) |  | (256) |
Increase due to business combinations |  | [1] |  | [2]
Additions | 6,845 |  | 12,202 |
Disposals / Consumptions | (5,392) |  | (2,557) |
Transfers / Reclassifications |  |  | (11,984) |
End of the year | 61,893 |  | 60,602 |
Accumulated depreciation, amortisation and impairment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 7,746,569 |  | 7,358,074 |
Translation differences | 56,677 |  | (26,878) |
Disposals / Consumptions | (64,834) |  | (31,542) |
Impairment charge (See note 5) | 36,000 |  |  |
Transfers / Reclassifications | (127) |  | (400) |
Depreciation charge | 530,539 |  | 447,315 |
End of the year | 8,304,824 |  | 7,746,569 |
Accumulated depreciation, amortisation and impairment [member] | Land and civil buildings [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 121,468 |  | 110,914 |
Translation differences | (288) |  | (420) |
Disposals / Consumptions | (89) |  | (73) |
Impairment charge (See note 5) |  |  |  |
Transfers / Reclassifications | (1) |  | (362) |
Depreciation charge | 11,368 |  | 11,409 |
End of the year | 132,458 |  | 121,468 |
Accumulated depreciation, amortisation and impairment [member] | Industrial buildings, plant and production equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 7,302,135 |  | 6,936,900 |
Translation differences | 56,560 |  | (24,973) |
Disposals / Consumptions | (57,897) |  | (25,580) |
Impairment charge (See note 5) | 36,000 |  |  |
Transfers / Reclassifications | 349 |  | (38) |
Depreciation charge | 492,973 |  | 415,826 |
End of the year | 7,830,120 |  | 7,302,135 |
Accumulated depreciation, amortisation and impairment [member] | Vehicles, furniture and fixtures [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year | 322,966 |  | 310,260 |
Translation differences | 405 |  | (1,485) |
Disposals / Consumptions | (6,848) |  | (5,889) |
Impairment charge (See note 5) |  |  |  |
Transfers / Reclassifications | (475) |  |  |
Depreciation charge | 26,198 |  | 20,080 |
End of the year | 342,246 |  | 322,966 |
Accumulated depreciation, amortisation and impairment [member] | Construction in progress [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year |  |  |  |
Translation differences |  |  |  |
Disposals / Consumptions |  |  |  |
Impairment charge (See note 5) |  |  |  |
Transfers / Reclassifications |  |  |  |
Depreciation charge |  |  |  |
End of the year |  |  |  |
Accumulated depreciation, amortisation and impairment [member] | Spare parts and equipment [member] |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Beginning of the year |  |  |  |
Translation differences |  |  |  |
Disposals / Consumptions |  |  |  |
Impairment charge (See note 5) |  |  |  |
Transfers / Reclassifications |  |  |  |
Depreciation charge |  |  |  |
End of the year |  |  |  |
[1] | Related to IPSCO acquisition. See note 32.
[2] | Related to SSPC acquisition. See note 32.

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