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10. INTANGIBLE ASSETS (Details)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning R$ 7,253,175
Effect of foreign exchange differences 7,839
Acquisitions and expeditures 1,427
Transfer to property, plant and equipment 11,896
Amortization (58,129)
Goodwill - Acquisition 50% CBSI 15,225
Consolidation CBSI on November 30, 2019. 348
Balance at end 7,231,781
Cost [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 7,903,220
Effect of foreign exchange differences
Balance at end 7,947,578
Accumulated Depreciation [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning (540,715)
Effect of foreign exchange differences
Balance at end (606,467)
Adjustment For Accumulated Recoverable Value [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning (109,330)
Effect of foreign exchange differences
Balance at end (109,330)
Goodwill [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 3,590,931
Goodwill - Acquisition 50% CBSI 15,225
Balance at end 3,606,156
Goodwill [Member] | Cost [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 3,831,338
Effect of foreign exchange differences
Balance at end 3,846,563
Goodwill [Member] | Accumulated Depreciation [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning (131,077)
Effect of foreign exchange differences
Balance at end (131,077)
Goodwill [Member] | Adjustment For Accumulated Recoverable Value [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning (109,330)
Effect of foreign exchange differences
Balance at end (109,330)
Customer Related Intangible Assets [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 288,773
Effect of foreign exchange differences 4,711
Amortization (47,345)
Balance at end 246,139
Customer Related Intangible Assets [Member] | Cost [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 573,614
Effect of foreign exchange differences
Balance at end 585,407
Customer Related Intangible Assets [Member] | Accumulated Depreciation [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning (284,841)
Effect of foreign exchange differences
Balance at end (339,268)
Software [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 54,972
Effect of foreign exchange differences 3
Acquisitions and expeditures 1,387
Transfer to property, plant and equipment 7,808
Amortization (10,657)
Consolidation CBSI on November 30, 2019. 346
Balance at end 53,859
Software [Member] | Cost [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 161,067
Effect of foreign exchange differences
Balance at end 171,152
Software [Member] | Accumulated Depreciation [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning (106,095)
Effect of foreign exchange differences
Balance at end (117,293)
Trademarks and Patents [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 150,009
Effect of foreign exchange differences 3,092
Consolidation CBSI on November 30, 2019. 2
Balance at end 153,103
Trademarks and Patents [Member] | Cost [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 150,009
Effect of foreign exchange differences
Balance at end 153,103
Rights and Licenses [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 3,166,999 [1]
Transfer to property, plant and equipment 4,088 [1]
Amortization (127) [1]
Balance at end 3,170,960 [1]
Rights and Licenses [Member] | Cost [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 3,185,701
Effect of foreign exchange differences
Balance at end 3,189,789
Rights and Licenses [Member] | Accumulated Depreciation [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning (18,702)
Effect of foreign exchange differences
Balance at end (18,829)
Other [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 1,491
Effect of foreign exchange differences 33
Acquisitions and expeditures 40
Balance at end 1,564
Other [Member] | Cost [Member]  
Disclosure of detailed information about intangible assets [line items]  
Balance at beginning 1,491
Effect of foreign exchange differences
Balance at end R$ 1,564
[1] Composed mainly by mineral rights. Amortization is recorded based on production volumes.