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25. SEGMENT INFORMATION (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [line items]      
Net revenues R$ 18,524,601 R$ 17,148,949 R$ 15,261,697
Cost of sales and services (13,596,141) (12,640,042) (11,740,101)
Gross profit 4,928,460 4,508,907 3,521,596
General and administrative expenses (2,230,948) (2,215,128) (1,900,521)
Depreciation 1,408,765 1,278,816 1,130,869
Proportionate EBITDA of joint ventures 538,170 502,345 499,475
Adjusted EBITDA [1] 4,644,447 4,074,940 3,521,419
Domestic market      
Disclosure of operating segments [line items]      
Net revenues 8,706,466 7,729,913 7,682,533
Foreign market      
Disclosure of operating segments [line items]      
Net revenues R$ 9,818,135 R$ 9,419,036 R$ 7,579,164
Steel      
Disclosure of operating segments [line items]      
Metric tons (Thou.) [2] 4921719 4,857,174 4,990,299
Net revenues R$ 12,959,023 R$ 11,515,908 R$ 11,202,999
Cost of sales and services (10,537,547) (9,393,237) (9,126,889)
Gross profit 2,421,476 2,122,671 2,076,110
General and administrative expenses (963,822) (914,927) (955,247)
Depreciation 658,587 679,074 670,496
Adjusted EBITDA 2,116,241 1,886,818 1,791,359
Steel | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 7,818,552 6,980,087 6,757,186
Steel | Foreign market      
Disclosure of operating segments [line items]      
Net revenues R$ 5,140,471 R$ 4,535,821 R$ 4,445,813
Mining      
Disclosure of operating segments [line items]      
Metric tons (Thou.) [2] 32576843 36,983,297 23,861,003
Net revenues R$ 4,620,971 R$ 4,581,903 R$ 3,187,250
Cost of sales and services (3,005,840) (3,099,236) (2,323,687)
Gross profit 1,615,131 1,482,667 863,563
General and administrative expenses (158,958) (185,149) (69,602)
Depreciation 490,805 461,287 377,344
Adjusted EBITDA 1,946,978 1,758,805 1,171,305
Mining | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 829,268 542,028 175,223
Mining | Foreign market      
Disclosure of operating segments [line items]      
Net revenues 3,791,703 4,039,875 3,012,027
Port      
Disclosure of operating segments [line items]      
Net revenues 238,240 207,722 212,729
Cost of sales and services (156,997) (141,542) (141,809)
Gross profit 81,243 66,180 70,920
General and administrative expenses (27,943) (25,180) (20,473)
Depreciation 15,752 13,430 12,777
Adjusted EBITDA 69,052 54,430 63,224
Port | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 238,240 207,722 212,729
Port | Foreign market      
Disclosure of operating segments [line items]      
Net revenues  
Railroads      
Disclosure of operating segments [line items]      
Net revenues 1,416,612 1,319,907 1,156,933
Cost of sales and services (1,024,696) (914,361) (788,046)
Gross profit 391,916 405,546 368,887
General and administrative expenses (94,921) (83,020) (89,678)
Depreciation 294,571 227,792 189,361
Adjusted EBITDA 591,566 550,318 468,570
Railroads | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 1,416,612 1,319,907 1,156,933
Railroads | Foreign market      
Disclosure of operating segments [line items]      
Net revenues    
Energy      
Disclosure of operating segments [line items]      
Net revenues 407,671 269,095 244,549
Cost of sales and services (285,085) (195,994) (195,644)
Gross profit 122,586 73,101 48,905
General and administrative expenses (27,098) (25,196) (23,186)
Depreciation 17,265 17,140 17,073
Adjusted EBITDA 112,753 65,045 42,792
Energy | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 407,671 R$ 269,095 R$ 244,549
Energy | Foreign market      
Disclosure of operating segments [line items]      
Net revenues    
Cement      
Disclosure of operating segments [line items]      
Metric tons (Thou.) [2] 3,313,061 2,814,476 2,181,731
Net revenues R$ 487,129 R$ 490,608 R$ 431,820
Cost of sales and services (512,762) (467,373) (330,263)
Gross profit (25,633) 23,235 101,557
General and administrative expenses (80,823) (74,528) (72,894)
Depreciation 121,801 73,030 46,505
Adjusted EBITDA 15,345 21,737 75,168
Cement | Domestic market      
Disclosure of operating segments [line items]      
Net revenues 487,129 R$ 490,608 431,820
Cement | Foreign market      
Disclosure of operating segments [line items]      
Net revenues    
Corporate expenses/elimination      
Disclosure of operating segments [line items]      
Metric tons (Thou.) [2] (5,359,571) (4,062,774)  
Net revenues R$ (1,605,045) R$ (1,236,194) (1,174,583)
Cost of sales and services 1,926,786 1,571,701 1,166,237
Gross profit 321,741 335,507 (8,346)
General and administrative expenses (877,383) (907,128) (669,441)
Depreciation (190,016) (192,937) (182,687)
Proportionate EBITDA of joint ventures 538,170 502,345 499,475
Adjusted EBITDA (207,488) (262,213) (360,999)
Corporate expenses/elimination | Domestic market      
Disclosure of operating segments [line items]      
Net revenues (2,491,006) (2,079,534) (1,295,907)
Corporate expenses/elimination | Foreign market      
Disclosure of operating segments [line items]      
Net revenues R$ 885,961 R$ 843,340 R$ 121,324
[1] The Company discloses its adjusted EBITDA net of its share of investments and other operating income (expenses) because it understands that these should not be included in the calculation of recurring operating cash generation.
[2] The ore sales volumes presented in this note take into consideration Company sales and the interest in its subsidiaries and joint ventures .