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19. Provisions (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
SummaryOfProvisionsLineItems [Line Items]    
Lawsuits filed by commercial customers 1,070 1,140
Lawsuits which customers claim a reduction in the sewage tariff 680 710
Lawsuits which customers plead reduction in tariff 50 50
Tax claims related to income tax and social contribution R$ 52,192 R$ 50,023
Tax deficiency notice related to sewage services 547,510 501,060
Offset requests for the extinction of IRPJ/CSLL payable 42,173 62,039
Request for an authorization to offset taxes 51,374 49,682
Tax adjustment rejected 11,862,000  
Request to offset tax credits related to IRPJ and CSLL - contingent liabilities 8,296 8,010
Request to offset tax credits related to IRPJ and CSLL - accrued 1,415 1,366
Lawsuits related to taxes and fines - accrued 40,123 39,495
Lawsuits related to taxes and fines - contingent liabilities 582,168 466,407
Intangible assets related to the municipalities 28,417 28,273
Indemnities receivable 24,071  
Increase in lawsuits deemed as contingent liabilities 561,400  
Legal and administrative agreements 41,133  
Legal and administrative agreements related to construction 19,077  
Legal and administrative agreements related to environmental indemnifications 22,056  
Environmental indemnifications 43,014 20,626
Guarantee insurance for escrow deposit 101,192 134,377
Renewed guarantee insurance 500,000  
Brazilian Federal Revenue Service    
SummaryOfProvisionsLineItems [Line Items]    
Tax adjustment rejected 56,118 8,659
IRPJ/CSLL    
SummaryOfProvisionsLineItems [Line Items]    
Tax adjustment rejected R$ 11,164 R$ 698