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10. Related-Party Balances and Transactions (Tables)
 12 Months Ended
Dec. 31, 2018
Relatedparty Balances And Transactions Tables Abstract  
Accounts receivable, interest on capital payable, revenue and expenses with the Sao Paulo State Government

  December 31, 2018 December 31, 2017
Accounts receivable    
Current:    
   Sanitation services (i) 122,522 118,441
   Allowance for losses (i) (33,820) (35,114)
   Reimbursement for retirement and pension benefits paid (G0):    
      - monthly flow (payments) (ii) 22,926 22,968
      - GESP Agreement – 2008 (ii) - 20,099
      - GESP Agreement – 2015 (iv)                                       62,520                                           54,379
     
Total current 174,148 180,773
     
Noncurrent:    
    Agreement for the installment payment of sanitation services 17,045 22,625
   Reimbursement for retirement and pension benefits paid (G0):    
      - GESP Agreement – 2015 (iv) 652,057 611,762
     
Total noncurrent 669,102 634,387
     
Total receivables from shareholders 843,250 815.160
     
Assets:    
Sanitation services 105,747 105,952
Reimbursement of additional retirement and pension benefits (G0) 737,503 709,208
     
Total 843,250 815,160
     
Liabilities:    
Interest on capital payable to related parties 338,407 300,717
Other (g) 8,694 1,367

 

 

2018

2017

2016

       
Revenue from sanitation services 501,146 462,989 445,726
Payments received from related parties (509,672) (471,081) (424,549)
       
Receipt of GESP reimbursement referring to Law 4,819/58 (173,516) (192,889) (121.709)
Loan agreement through credit facility

 

  2018 2017 2016
       
Revenue from sanitation services 501,146 462,989 445,726
Payments received from related parties (509,672) (471,081) (424,549)
       
Receipt of GESP reimbursement referring to Law 4,819/58 (173,516) (192,889) (139,472)