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24. Operating segment information (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfOperatingSegmentInformationLineItems [Line Items]      
Gross operating revenue R$ 15,374,623 R$ 14,855,109 R$ 12,283,541
Gross sales deductions (766,390) (756,901) (571,972)
Net operating revenue 14,608,233 14,098,208 11,711,569
Costs, selling and administrative expenses (10,646,646) (10,678,063) (8,813,930)
Income from operations before other operating expenses, net and equity accounting 3,961,587 3,420,145 2,897,639
Other operating income / (expenses), net (5,679) 4,722 143,755
Equity accounting 5,760 4,740 2,597
Financial result, net (458,054) 699,447 (2,456,462)
Income from operations before taxes 3,503,614 4,129,054 587,529
Depreciation and amortization 1,301,897 1,146,626 1,074,032
Sanitation      
SummaryOfOperatingSegmentInformationLineItems [Line Items]      
Gross operating revenue 12,223,746 11,122,232 8,946,825
Gross sales deductions (766,390) (756,901) (571,972)
Net operating revenue 11,457,356 10,365,331 8,374,853
Costs, selling and administrative expenses (7,566,104) (7,026,699) (5,550,122)
Income from operations before other operating expenses, net and equity accounting 3,891,252 3,338,632 2,824,731
Depreciation and amortization 1,301,897 1,146,626 1,074,032
Reconciliation to the financial statements      
SummaryOfOperatingSegmentInformationLineItems [Line Items]      
Gross operating revenue 3,150,877 3,732,877 3,336,716
Gross sales deductions 0 0 0
Net operating revenue 3,150,877 3,732,877 3,336,716
Costs, selling and administrative expenses (3,080,542) (3,651,364) (3,263,808)
Income from operations before other operating expenses, net and equity accounting 70,335 81,513 72,908
Depreciation and amortization R$ 0 R$ 0 R$ 0