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Commitments - Contracts (Detail)
 12 Months Ended
Dec. 31, 2020
Cargo contract one [member]  
Summary of contract commitments [line items]  
Port Aratu
Minimum movement in tons per years 900,000
Maturity 2022
Cargo contract two [member]  
Summary of contract commitments [line items]  
Port Suape
Minimum movement in tons per years 250,000
Maturity 2027
Cargo contract three [member]  
Summary of contract commitments [line items]  
Port Suape
Minimum movement in tons per years 400,000
Maturity 2029
Cargo contract four [member]  
Summary of contract commitments [line items]  
Port Aratu
Minimum movement in tons per years 397,000
Maturity 2031
Cargo contract five [member]  
Summary of contract commitments [line items]  
Port Itaqui
Minimum movement in tons per years 1,222,377
Maturity 2049