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Depreciation and amortization (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Depreciation and amortization (Tables) [Abstract]      
Amortization expenses R$ (3,331,240) R$ (2,516,777) R$ (1,884,281)
Depreciation (1,237,328) (1,141,636) (1,057,722)
Total R$ (4,568,568) R$ (3,658,413) R$ (2,942,003)