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32. Commitments (Details)
 12 Months Ended
Dec. 31, 2017
Cargo Contract One  
SummaryOfContractCommitmentsLineItems [Line Items]  
Port Aratu
Minimum movement in tons per years 397,000
Maturity 2031
Cargo Contract Two  
SummaryOfContractCommitmentsLineItems [Line Items]  
Port Aratu
Minimum movement in tons per years 900,000
Maturity 2022
Cargo Contract Three  
SummaryOfContractCommitmentsLineItems [Line Items]  
Port Suape
Minimum movement in tons per years 250,000
Maturity 2027
Cargo Contract Four  
SummaryOfContractCommitmentsLineItems [Line Items]  
Port Suape
Minimum movement in tons per years 400,000
Maturity 2029