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CONSOLIDATE STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Line Items]      
Net income (loss) for the year R$ (2,814,742) R$ 319,814 R$ 1,820,994
Items that will not be reclassified to profit or loss      
Tax effect of the above items (1,216)    
Subsidiary effect 2,749    
Tax effect of the subsidiary effect (935)    
Actuarial gain (loss) (147,640) (69,305) 4,173
Tax effect on actuarial liabilities 50,198 23,564 (1,419)
Total other comprehensive income that will not be reclassified to profit or loss, net of tax (2,908,010) 274,073 1,823,748
Items that may be subsequently reclassified to profit or loss      
Exchange variation on conversion of financial statements and on foreign investments 45,819 137,546 38,006
Total comprehensive income (loss) (2,862,191) 411,619 1,861,754
Attributable to      
Controlling shareholders' (2,864,967) 411,498 R$ 1,861,754
Non-controlling interest 2,776 R$ 121  
CelluForce Inc.      
Items that will not be reclassified to profit or loss      
Exchange rate variation and fair value on financial assets measured at fair value through of comprehensive income 1,667    
Ensyn Corporation      
Items that will not be reclassified to profit or loss      
Exchange rate variation and fair value on financial assets measured at fair value through of comprehensive income 3,153    
Spinnova Oy      
Items that will not be reclassified to profit or loss      
Exchange rate variation and fair value on financial assets measured at fair value through of comprehensive income R$ (1,244)