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Loans, Financings and Debentures - Summary of the Currencies and Indexors Used for Monetary Updating of Loans and Financings (Detail)
Dec. 31, 2017
Dec. 31, 2016
US dollar [member]    
Disclosure of detailed information about borrowings [line items]    
Accumulated change 1.50% (16.54%)
Euro [member]    
Disclosure of detailed information about borrowings [line items]    
Accumulated change 15.41% (19.10%)
IPCA.[member]    
Disclosure of detailed information about borrowings [line items]    
Accumulated change 2.95% 6.29%
CDI [member]    
Disclosure of detailed information about borrowings [line items]    
Accumulated change 9.93% 14.06%