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10. Related-Party Balances and Transactions (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |
Accounts receivable, current | R$ 180,773 | R$ 202,553
Accounts receivable, noncurrent | 634,387 | 669,156
Total receivables from shareholders | 815,160 | 871,709
Interest on capital payable to related parties | 300,717 | 351,788
Other | 1,367 | 1,853
Sanitation services |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |
Accounts receivable, current | 118,441 | 134,005
Total receivables from shareholders | 105,952 | 77,381
Allowance for losses |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |
Accounts receivable, current | 35,114 | 56,624
Reimbursement for benefits - monthly flow |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |
Accounts receivable, current | 22,968 | 22,696
Total receivables from shareholders | 709,208 | 788,180
Reimbursement for benefits - GESP 2008 |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |
Accounts receivable, current | 20,099 | 56,512
Accounts receivable, noncurrent | 0 | 18,838
Reimbursement for benefits - GESP 2015 |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |
Accounts receivable, current | 54,379 | 39,816
Accounts receivable, noncurrent | 611,762 | 650,318
Se Liga na Rede program |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |
Accounts receivable, current | 0 | 6,148
Total receivables from shareholders | 0 | 6,148
Agreement for the installment payment of sanitation services |  |
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items] |  |
Accounts receivable, noncurrent | R$ 22,625 | R$ 0

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