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10. Related-Party Balances and Transactions (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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