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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Allocated net income available to Common and Preferred shareholders      
Net income (loss) available to owners of parent R$ 1,203,736 R$ 2,303,868 R$ (359,360)
Weighted - average number of shares outstanding      
Earnings per share - Diluted (Common and Preferred Shares) R$ 0.70 R$ 1.34 R$ (0.21)
Common shares      
Allocated net income available to Common and Preferred shareholders      
Net income (loss) available to owners of parent R$ 405,607 R$ 774,279 R$ (120,267)
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. (2,884) (6,515)  
Net income (loss) available to owners of parent including effects of dilutive shares R$ 402,723 R$ 767,764  
Weighted - average number of shares outstanding      
Weighted-average number of shares outstanding 571,929,945 571,929,945  
Preferred shares      
Allocated net income available to Common and Preferred shareholders      
Net income (loss) available to owners of parent R$ 798,129 R$ 1,529,589 R$ (239,093)
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. 2,884 6,515  
Net income (loss) available to owners of parent including effects of dilutive shares R$ 801,013 R$ 1,536,104  
Weighted - average number of shares outstanding      
Weighted-average number of shares outstanding 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 12,157,614 14,440,860  
Total 1,137,565,794 1,144,292,458