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Intangible Assets - Intangible assets with determined useful life (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Mar. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Intangible assets with determined useful life      
Balance at the beginning of the year   R$ 141,785 R$ 172,947
Acquisitions   7,217 8,054
Foreign currency translation adjustment   12,461 1,284
Amortization   (31,100) (30,268)
Write-offs     (18,937)
Transfers and others   8,945 8,705
Book Balance   180,311 141,785
Balance at the end of the year   180,311 141,785
Facepa      
Intangible assets with determined useful life      
Acquisition of assets identified R$ 211 53,477  
Amortization   (12,699)  
PCH Mucuri / Facepa      
Intangible assets with determined useful life      
Acquisition through business combination   766  
Amortization   (541)  
Cost      
Intangible assets with determined useful life      
Balance at the beginning of the year   317,482 318,376
Balance at the end of the year   400,348 317,482
Accumulated Depreciation and Amortization      
Intangible assets with determined useful life      
Balance at the beginning of the year   (175,698) (145,429)
Balance at the end of the year   R$ (220,037) (175,698)
Trademarks      
Intangible assets with determined useful life      
Useful life (years)   8 years 4 months 24 days  
Balance at the beginning of the year   R$ 610 715
Amortization   (100) (105)
Book Balance   19,477 610
Balance at the end of the year   19,477 610
Trademarks | Facepa      
Intangible assets with determined useful life      
Acquisition through business combination 21,598    
Acquisition of assets identified   21,598  
Amortization   (2,635)  
Trademarks | PCH Mucuri / Facepa      
Intangible assets with determined useful life      
Acquisition through business combination   17  
Amortization   (13)  
Trademarks | Cost      
Intangible assets with determined useful life      
Balance at the beginning of the year   1,635 1,635
Balance at the end of the year   23,250 1,635
Trademarks | Accumulated Depreciation and Amortization      
Intangible assets with determined useful life      
Balance at the beginning of the year   (1,025) (920)
Balance at the end of the year   R$ (3,773) (1,025)
Softwares      
Intangible assets with determined useful life      
Useful life (years)   5 years  
Balance at the beginning of the year   R$ 66,119 71,185
Acquisitions   7,217 8,054
Amortization   (23,390) (21,825)
Transfers and others   8,945 8,705
Book Balance   59,112 66,119
Balance at the end of the year   59,112 66,119
Softwares | PCH Mucuri / Facepa      
Intangible assets with determined useful life      
Acquisition through business combination   749  
Amortization   (528)  
Softwares | Cost      
Intangible assets with determined useful life      
Balance at the beginning of the year   137,477 120,718
Balance at the end of the year   154,388 137,477
Softwares | Accumulated Depreciation and Amortization      
Intangible assets with determined useful life      
Balance at the beginning of the year   (71,358) (49,533)
Balance at the end of the year   R$ (95,276) (71,358)
Customer relationship      
Intangible assets with determined useful life      
Useful life (years)   2 years 6 months  
Balance at the beginning of the year   R$ 0  
Book Balance   19,003  
Balance at the end of the year   19,003 0
Customer relationship | Facepa      
Intangible assets with determined useful life      
Acquisition through business combination 28,505    
Acquisition of assets identified   28,505  
Amortization   (9,502)  
Customer relationship | Cost      
Intangible assets with determined useful life      
Balance at the end of the year   28,505  
Customer relationship | Accumulated Depreciation and Amortization      
Intangible assets with determined useful life      
Balance at the end of the year   R$ (9,502)  
Non-Compete      
Intangible assets with determined useful life      
Useful life (years)   5 years  
Balance at the beginning of the year   R$ 0  
Book Balance   2,812  
Balance at the end of the year   2,812 0
Non-Compete | Facepa      
Intangible assets with determined useful life      
Acquisition through business combination R$ 3,374    
Acquisition of assets identified   3,374  
Amortization   (562)  
Non-Compete | Cost      
Intangible assets with determined useful life      
Balance at the end of the year   3,374  
Non-Compete | Accumulated Depreciation and Amortization      
Intangible assets with determined useful life      
Balance at the end of the year   R$ (562)  
R&D Agreements      
Intangible assets with determined useful life      
Useful life (years)   18 years 9 months 18 days  
Balance at the beginning of the year   R$ 75,055 101,047
Foreign currency translation adjustment   12,461 1,284
Amortization   (7,610) (8,339)
Write-offs     (18,937)
Book Balance   79,906 75,055
Balance at the end of the year   79,906 75,055
R&D Agreements | Cost      
Intangible assets with determined useful life      
Balance at the beginning of the year   178,370 196,023
Balance at the end of the year   190,831 178,370
R&D Agreements | Accumulated Depreciation and Amortization      
Intangible assets with determined useful life      
Balance at the beginning of the year   (103,315) (94,976)
Balance at the end of the year   R$ (110,925) R$ (103,315)