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29. Operating costs and expenses (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | R$ (9,086,456) | R$ (8,778,963) | R$ (9,013,120)
Selling expenses | (693,480) | (686,012) | (639,559)
Bad debt expense, net of recoveries | (166,727) | (82,681) | (90,488)
Administrative expenses | (996,877) | (1,098,990) | (934,896)
Total | (10,943,540) | (10,646,646) | (10,678,063)
Salaries, payroll charges and benefits |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (1,959,539) | (1,841,571) | (1,718,199)
Selling expenses | (289,378) | (305,440) | (271,690)
Administrative expenses | (254,284) | (229,752) | (194,357)
Total | (2,503,201) | (2,376,763) | (2,184,246)
Pension obligations |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (25,066) | (48,381) | 131,469
Selling expenses | (3,602) | (7,296) | 17,941
Administrative expenses | (141,758) | (171,830) | (136,358)
Total | (170,426) | (227,507) | 13,052
Construction costs |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (2,739,657) | (3,080,542) | (3,651,364)
Total | (2,739,657) | (3,080,542) | (3,651,364)
General supplies |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (238,034) | (163,712) | (173,224)
Selling expenses | (6,391) | (4,451) | (3,585)
Administrative expenses | (4,881) | (5,675) | (2,585)
Total | (249,306) | (173,838) | (179,394)
Treatment supplies |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (265,146) | (287,592) | (279,150)
Total | (265,146) | (287,592) | (279,150)
Outsourced services |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (996,477) | (857,063) | (845,334)
Selling expenses | (273,470) | (258,287) | (278,565)
Administrative expenses | (204,728) | (183,746) | (154,926)
Total | (1,474,675) | (1,299,096) | (1,278,825)
Electricity |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (956,840) | (794,352) | (932,435)
Selling expenses | (1,154) | (762) | (751)
Administrative expenses | (1,363) | (965) | (1,848)
Total | (959,357) | (796,079) | (935,034)
General expenses |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (629,253) | (531,985) | (471,965)
Selling expenses | (102,213) | (94,112) | (93,180)
Administrative expenses | (232,288) | (302,113) | (289,862)
Total | (963,754) | (928,210) | (855,007)
Depreciation and amortization |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Cost of services | (1,276,444) | (1,173,765) | (1,072,918)
Selling expenses | (17,272) | (15,664) | (9,729)
Administrative expenses | (98,825) | (112,468) | (63,979)
Total | (1,392,541) | (1,301,897) | (1,146,626)
Tax expenses |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Administrative expenses | (58,750) | (92,441) | (90,981)
Total | (58,750) | (92,441) | (90,981)
Bad debt expense, net of recoveries |  |  |
SummaryOfOperatingCostsAndExpensesLineItems [Line Items] |  |  |
Selling expenses | (166,727) | (82,681) | (90,488)
Total | R$ (166,727) | R$ (82,681) | R$ (90,488)

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