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Other disclosures on cash flows (Details 1) (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Noncash Investing And Financing Activities [Abstract]    
Transfer of assets and liabilities R$ 56,351 R$ 399,048
Capitalization of related party transactions R$ 26,610