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14. Intangible assets (Details Narrative) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible Assets Details Narrative      
Indemnities receivable, noncurrent R$ 24,071    
Number of municipalities 368 366  
Program Contracts Commitments, Current R$ 128,802 R$ 109,042  
Program Contracts Commitments, Noncurrent 110,698 69,051  
Capitalized interest and inflation adjustment 649,048 700,743 R$ 466,544
Construction margin 70,335 81,513 72,908
Expropriations 19,576 40,452 R$ 66,801
Intangible assets - PPP R$ 2,818,805 1,951,538  
Intangible assets, physical evolution of contruction - PPP 89.00%    
Intangible assets, discount rate for adjustment - PPP 7.80%    
Intangible assets work in progress R$ 10,387,000 R$ 9,156,000  
Intangible assets work in progress - São Paulo 6,497,000    
Intangible assets work in progress - PPP SÃO LOURENÇO 2,819,000    
Intangible assets work in progress - Franca 253,000    
Intangible assets work in progress, Itanhaém R$ 208,000    
Amortization average rate 3.90% 3.90% 3.90%
Intangible assets related to PPP ALTO TIETÊ R$ 371,862 R$ 382,103  
Estimated monetary restatement 7,900,000    
Monthly assigned funds from tariffs R$ 10,012    
Adjustment to present value of agreement 8.20%    
Agreement percentage of revenue 55.38%    
Construction margin 2.30% 2.30%  
Funds from tariffs arising from services provided R$ 24,400