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EARNINGS (LOSS) PER SHARE (EPS) - Diluted (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allocated net income available to Common and Preferred shareholders      
Net income R$ 2,365,763 R$ 1,203,736 R$ 2,303,868
Weighted - average number of shares outstanding      
Earnings per share - Diluted (Common and Preferred Shares) R$ 1.38 R$ 0.70 R$ 1.34
Common shares      
Allocated net income available to Common and Preferred shareholders      
Net income R$ 795,617 R$ 405,607 R$ 774,279
Adjustment to net income allocated to preferred shareholders in respect to the potential increase in number of preferred shares outstanding, as a result of long-term incentive plans of Gerdau. (4,782) (2,884) (6,515)
Net income available to owners of parent including effects of dilutive shares R$ 790,835 R$ 402,723 R$ 767,764
Weighted - average number of shares outstanding      
Weighted-average number of shares outstanding 571,929,945 571,929,945 571,929,945
Preferred shares      
Allocated net income available to Common and Preferred shareholders      
Net income R$ 1,570,146 R$ 798,129 R$ 1,529,589
Adjustment to net income allocated to preferred shareholders in respect to the potential increase in number of preferred shares outstanding, as a result of long-term incentive plans of Gerdau. 5,524 2,884 6,515
Net income available to owners of parent including effects of dilutive shares R$ 1,575,670 R$ 801,013 R$ 1,536,104
Weighted - average number of shares outstanding      
Weighted-average number of shares outstanding 1,128,700,478 1,125,408,180 1,129,851,598
Potential increase in number of preferred shares outstanding in respect of long-term incentive plan of Gerdau 10,821,083 12,157,614 14,440,860
Total 1,139,521,561 1,137,565,794 1,144,292,458