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26. SEGMENT INFORMATION (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Net revenues R$ 22,968,885 R$ 18,524,601 R$ 17,148,949
Cost of sales and services (16,105,657) (13,596,141) (12,640,042)
Gross profit 6,863,228 4,928,460 4,508,907
General and administrative expenses (2,757,711) (2,230,948) (2,215,128)
Depreciation 1,175,107 1,408,765 1,278,816
Proportionate EBITDA of joint ventures 568,045 538,170 502,345
Adjusted EBITDA 5,848,669 4,644,447 4,074,940
Domestic market      
Disclosure of operating segments [line items]      
Net revenues 11,353,437 8,706,466 7,729,913
Foreign market      
Disclosure of operating segments [line items]      
Net revenues R$ 11,615,448 R$ 9,818,135 R$ 9,419,036
Steel      
Disclosure of operating segments [line items]      
Metric tons (Thou.) 5,068,758 4921719             4,857,174
Net revenues R$ 15,634,143 R$ 12,959,023 R$ 11,515,908
Cost of sales and services 12,613,216 (10,537,547) 9,393,237
Gross profit 3,020,927 2,421,476 2,122,671
General and administrative expenses (984,980) (963,822) (914,927)
Depreciation 609,274 658,587 679,074
Adjusted EBITDA 2,645,221 2,116,241 1,886,818
Steel | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 10,328,372 7,818,552 6,980,087
Steel | Foreign market      
Disclosure of operating segments [line items]      
Net revenues R$ 5,305,771 R$ 5,140,471 R$ 4,535,821
Mining      
Disclosure of operating segments [line items]      
Metric tons (Thou.) 34,780,756 32576843           36,983,297
Net revenues R$ 5,984,781 R$ 4,620,971 R$ 4,581,903
Cost of sales and services 3,585,691 (3,005,840) 3,099,236
Gross profit 2,399,090 1,615,131 1,482,667
General and administrative expenses (144,754) (158,958) (185,149)
Depreciation 366,547 490,805 461,287
Adjusted EBITDA 2,620,883 1,946,978 1,758,805
Mining | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 972,360 829,268 542,028
Mining | Foreign market      
Disclosure of operating segments [line items]      
Net revenues 5,012,421 3,791,703 4,039,875
Port      
Disclosure of operating segments [line items]      
Net revenues 266,378 238,240 207,722
Cost of sales and services 189,999 (156,997) 141,542
Gross profit 76,379 81,243 66,180
General and administrative expenses (35,423) (27,943) (25,180)
Depreciation 20,368 15,752 13,430
Adjusted EBITDA 61,324 69,052 54,430
Port | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 266,378 238,240 207,722
Port | Foreign market      
Disclosure of operating segments [line items]      
Net revenues    
Railroads      
Disclosure of operating segments [line items]      
Net revenues 1,506,114 1,416,612 1,319,907
Cost of sales and services 1,049,071 (1,024,696) 914,361
Gross profit 457,043 391,916 405,546
General and administrative expenses (106,412) (94,921) (83,020)
Depreciation 258,985 294,571 227,792
Adjusted EBITDA 609,616 591,566 550,318
Railroads | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 1,506,114 1,416,612 1,319,907
Railroads | Foreign market      
Disclosure of operating segments [line items]      
Net revenues    
Energy      
Disclosure of operating segments [line items]      
Net revenues 410,606 407,671 269,095
Cost of sales and services 286,734 (285,085) 195,994
Gross profit 123,872 122,586 73,101
General and administrative expenses (27,948) (27,098) (25,196)
Depreciation 17,285 17,265 17,140
Adjusted EBITDA 113,209 112,753 65,045
Energy | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 410,606 407,671 269,095
Energy | Foreign market      
Disclosure of operating segments [line items]      
Net revenues    
Cement      
Disclosure of operating segments [line items]      
Metric tons (Thou.)   3,313,061  
Net revenues 588,230 R$ 487,129 490,608
Cost of sales and services 544,266 (512,762) 467,373
Gross profit 43,964 (25,633) 23,235
General and administrative expenses (95,893) (80,823) (74,528)
Depreciation 115,411 121,801 73,030
Adjusted EBITDA 63,482 15,345 21,737
Cement | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 588,230 487,129 R$ 490,608
Cement | Foreign market      
Disclosure of operating segments [line items]      
Net revenues    
Corporate expenses/elimination      
Disclosure of operating segments [line items]      
Metric tons (Thou.)   (5,359,571)   (4,062,774)
Net revenues (1,421,367) R$ (1,605,045) R$ (1,236,194)
Cost of sales and services (2,163,320) 1,926,786 (1,571,701)
Gross profit 741,953 321,741 335,507
General and administrative expenses (1,362,301) (877,383) (907,128)
Depreciation (212,763) (190,016) (192,937)
Proportionate EBITDA of joint ventures 568,045 538,170 502,345
Adjusted EBITDA (265,066) (207,488) (262,213)
Corporate expenses/elimination | Domestic market      
Disclosure of operating segments [line items]      
Net revenues (2,718,623) (2,491,006) (2,079,534)
Corporate expenses/elimination | Foreign market      
Disclosure of operating segments [line items]      
Net revenues R$ 1,297,256 R$ 885,961 R$ 843,340