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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Allocated net income available to Common and Preferred shareholders      
Net income (loss) available to owners of parent R$ 2,303,868 R$ (359,360) R$ (2,890,811)
Weighted - average number of shares outstanding      
Earnings per share - Diluted (Common and Preferred Shares) R$ 1.34 R$ (0.21) R$ (1.70)
Common shares      
Allocated net income available to Common and Preferred shareholders      
Net income (loss) available to owners of parent R$ 774,279 R$ (120,267) R$ (969,954)
Adjustment to net income in respect to the potential increase in number of shares outstanding, as a result of options granted to acquire stock of Gerdau (6,515)    
Net income (loss) available to owners of parent including effects of dilutive shares R$ 767,764    
Weighted - average number of shares outstanding      
Weighted-average number of shares outstanding 571,929,945    
Preferred shares      
Allocated net income available to Common and Preferred shareholders      
Net income (loss) available to owners of parent R$ 1,529,589 R$ (239,093) R$ (1,920,857)
Adjustment to net income in respect to the potential increase in number of shares outstanding, as a result of options granted to acquire stock of Gerdau 6,515    
Net income (loss) available to owners of parent including effects of dilutive shares R$ 1,536,104    
Weighted - average number of shares outstanding      
Weighted-average number of shares outstanding 1,129,851,598    
Potential increase in number of preferred shares outstanding in respect of stock option plan 14,440,860    
Total 1,144,292,458