XML 70 R48.htm IDEA: XBRL DOCUMENT
v3.8.0.1

INTANGIBLE ASSETS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
INTANGIBLE ASSETS |
Summary of intangible assets |
|  | Supplier relationships |  | Software development |  | Customer contracts and relationships |  | Others |  | Total |
Balance as of January 1, 2015 |  | 56,654 |  | 688,061 |  | 749,027 |  | 53,356 |  | 1,547,098 |
Foreign exchange effect |  | — |  | 123,167 |  | 327,424 |  | 14,375 |  | 464,966 |
Acquisition |  | — |  | 118,933 |  | — |  | 7,495 |  | 126,428 |
Disposal |  | — |  | (1,182 | ) | — |  | (4,208 | ) | (5,390 | )
Amortization |  | (9,083 | ) | (120,497 | ) | (164,968 | ) | (2,793 | ) | (297,341 | )
Balance as of December 31, 2015 |  | 47,571 |  | 808,482 |  | 911,483 |  | 68,225 |  | 1,835,761 |
Foreign exchange effect |  | — |  | (60,464 | ) | (140,812 | ) | (7,509 | ) | (208,785 | )
Acquisition |  | — |  | 40,643 |  | — |  | 13,401 |  | 54,044 |
Disposal |  | — |  | (2,145 | ) | — |  | (13,050 | ) | (15,195 | )
Amortization |  | (7,845 | ) | (149,911 | ) | (155,063 | ) | (5,316 | ) | (318,135 | )
(-) Effect of selling of subsidiary |  | — |  | — |  | — |  | (27,749 | ) | (27,749 | )
Balance as of December 31, 2016 |  | 39,726 |  | 636,605 |  | 615,608 |  | 28,002 |  | 1,319,941 |
Foreign exchange effect |  | — |  | 2,947 |  | 3,835 |  | 884 |  | 7,666 |
Acquisition |  | — |  | 37,939 |  | — |  | — |  | 37,939 |
Disposal |  | — |  | — |  | (27,652 | ) | — |  | (27,652 | )
Amortization |  | (6,940 | ) | (149,150 | ) | (125,621 | ) | (3,486 | ) | (285,197 | )
(-) Assets held for sale (note 3.4) |  | — |  | (37,512 | ) | (25,396 | ) | (17,700 | ) | (80,608 | )
Balance as of December 31, 2017 |  | 32,786 |  | 490,829 |  | 440,774 |  | 7,700 |  | 972,089 |
Estimated useful lives |  | 5 to 20 years |  | 7 years |  | 5 to 20 years |  | 5 years |  |  |
Summary of intangible assets by segment |
|  | 2017 |  | 2016 |  | 2015 |
Brazil |  | 351,578 |  | 412,134 |  | 459,383 |
Special Steel |  | 152,640 |  | 219,878 |  | 357,435 |
South America |  | 1,863 |  | 7,606 |  | 13,507 |
North America |  | 466,008 |  | 680,323 |  | 1,005,436 |
|  | 972,089 |  | 1,319,941 |  | 1,835,761 |

X
- Definition The disclosure of intangible assets by segment. + References No definition available. + Details
Name: | ggb_DisclosureOfIntangibleAssetsBySegmentTextBlock
Namespace Prefix: | ggb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of detailed information about intangible assets. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutIntangibleAssetsExplanatory
Namespace Prefix: | ifrs-full_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfIntangibleAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration