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INVESTMENTS IN ASSOCIATES AND JOINT VENTURES (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
INVESTMENTS IN ASSOCIATES AND JOINT VENTURES      
Balance at beginning of period R$ 1,280,299 R$ 798,844 R$ 1,392,882
Equity in earnings 10,141 (34,597) (12,771)
Cumulative Translation Adjustment 125,719 (16,745) (251,195)
Capital increase 7,000 362,857  
Joint venture creation   145,084  
Contingent price complement   65,500  
Effect of selling of subsidiary     (205,577)
Dividends/Interest on equity (55,357) (40,644) (124,495)
Balance at end of period 1,367,802 1,280,299 798,844
Advance for future investment in joint venture 375,456    
Investments in North America      
INVESTMENTS IN ASSOCIATES AND JOINT VENTURES      
Balance at beginning of period 346,080 303,526 509,086
Equity in earnings (77,909) (111,581) (70,618)
Cumulative Translation Adjustment 33,101 (10,485) (126,660)
Capital increase   178,670  
Dividends/Interest on equity   (14,050) (8,282)
Balance at end of period 301,272 346,080 303,526
Investments in South America      
INVESTMENTS IN ASSOCIATES AND JOINT VENTURES      
Balance at beginning of period 584,899 404,522 792,117
Equity in earnings 51,648 41,553 40,067
Cumulative Translation Adjustment 96,045 (6,260) (124,185)
Joint venture creation   145,084  
Effect of selling of subsidiary     (203,843)
Dividends/Interest on equity (31,359)   (99,634)
Balance at end of period 701,233 584,899 404,522
Investments in Special Steel      
INVESTMENTS IN ASSOCIATES AND JOINT VENTURES      
Balance at beginning of period 199,647 0 0
Equity in earnings 15,629 15,460  
Cumulative Translation Adjustment (1,377)    
Capital increase   184,187  
Balance at end of period 213,899 199,647 0
Others      
INVESTMENTS IN ASSOCIATES AND JOINT VENTURES      
Balance at beginning of period 149,673 90,796 91,679
Equity in earnings 20,773 19,971 17,780
Cumulative Translation Adjustment (2,050)   (350)
Capital increase 7,000    
Contingent price complement   65,500  
Effect of selling of subsidiary     (1,734)
Dividends/Interest on equity (23,998) (26,594) (16,579)
Balance at end of period 151,398 R$ 149,673 R$ 90,796
Gerdau Corsa S.A.P.I de C.V.      
INVESTMENTS IN ASSOCIATES AND JOINT VENTURES      
Advance for future investment in joint venture R$ 375,456