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10. Related-Party Balances and Transactions (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items]    
Principal disbursed amount R$ 30,029  
Interest balance 20,588  
Loan agreement total 50,617 R$ 52,407
Attend Ambiental    
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items]    
Principal disbursed amount 5,400  
Interest balance 3,877  
Loan agreement total R$ 9,277  
Interest rate SELIC + 3.5 % a.a.  
Maturity The loan agreement with SPE Attend Ambiental S/A matures within 180 days, from the date when the respective amount is available in the borrower’s account, renewable for the same period. The credit has been overdue since May 11, 2015 and is subject to contractual default charges (inflation adjustment considering the IGP-M variation, 2% fine and default interest of 1% p.m.). The agreement has been renegotiated between the parties.  
Aquapolo Ambiental    
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items]    
Principal disbursed amount R$ 5,629  
Interest balance 5,209  
Loan agreement total R$ 10,838  
Interest rate CDI + 1.2% a.a.  
Maturity The R$ 5,629 loan agreement originally expired on April 30, 2016. As of February 10, 2016, an amendment to the agreement changed the payment schedule for four annual installments, the first of which maturing on December 30, 2018 and the last on December 30, 2021; and  
Aquapolo Ambiental    
SummaryOfRelatedPartyBalancesAndTransactionsLineItems [Line Items]    
Principal disbursed amount R$ 19,000  
Interest balance 11,502  
Loan agreement total R$ 30,502  
Interest rate CDI + 1.2% a.a.  
Maturity The loan agreement totaling R$ 19,000 originally expired on April 30, 2015, was extended to October 30, 2015 and on November 25, 2015 a new amendment changed the payment schedule for three annual installments, the first of which maturing on December 30, 2021 and the last on December 30, 2023.