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10. Related-Party Balances and Transactions (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |  |
Revenues | R$ 14,608,233 | R$ 14,098,208 | R$ 11,711,569
Sanitation services |  |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |  |
Revenues | 462,989 | 445,726 | 357,512
Payments received from related parties |  |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |  |
Revenues | (471,081) | (424,549) | (338,471)
Receipt of GESP reimbursement referring to Law 4819/58 |  |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |  |
Receipt of GESP reimbursement | R$ (192,889) | R$ (139,472) | R$ (121,709)

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