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12. Investments (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity | R$ 17,513,009 | R$ 15,419,211 |  | R$ 13,716,606 | R$ 13,304,403
Profit for the year | 2,519,310 | 2,947,098 |  | 536,279 |
Investments | 36,932 | 31,096 |  |  |
Dividends distributed | 598,612 | 700,034 |  |  |
Sesamm |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity | 39,262 | 37,198 |  | 32,313 |
Provisioned dividends | (643) | 0 | [1] |  |
Provisioned dividends - change in the equity | 0 | 0 |  |  |
Profit for the year | 2,707 | 8,601 |  | 6,082 |
Profit for the year - change in the equity | 0 |  |  |  |
Investments | 14,135 | 13,391 |  |  |
Dividends distributed | (231) | 0 | [1] |  |
Dividends distributed - change in the equity | 0 |  |  |  |
Equity in the earnings of subsidiaries | 975 | R$ 3,096 |  | R$ 2,190 |
Equity in the earnings of subsidiaries - change in the equity | R$ 0 |  |  |  |
Interest percentage | 36.00% | 36.00% |  | 36.00% |
Aguas de Andradina |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity | R$ 21,432 | R$ 16,161 |  | R$ 15,191 |
Provisioned dividends | 0 | 800 | [1] |  |
Provisioned dividends - change in the equity | 800 |  |  |  |
Profit for the year | 4,471 | 1,772 |  | 2,371 |
Profit for the year - change in the equity | (2,040) |  |  |  |
Investments | 5,818 | 4,849 |  |  |
Dividends distributed | 0 | 240 | [1] |  |
Dividends distributed - change in the equity | 240 |  |  |  |
Equity in the earnings of subsidiaries | 1,341 | R$ 532 |  | R$ 711 |
Equity in the earnings of subsidiaries - change in the equity | R$ (612) |  |  |  |
Interest percentage | 30.00% | 30.00% |  | 30.00% |
Aguas de Castilho |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity | R$ 4,858 | R$ 3,706 |  | R$ 3,449 |
Provisioned dividends | 0 | 219 | [1] |  |
Provisioned dividends - change in the equity | 219 |  |  |  |
Profit for the year | 933 | 631 |  | 773 |
Profit for the year - change in the equity | 22 |  |  |  |
Investments | 1,465 | 1,112 |  |  |
Dividends distributed | 0 | 66 | [1] |  |
Dividends distributed - change in the equity | 66 |  |  |  |
Equity in the earnings of subsidiaries | 280 | R$ 189 |  | R$ 232 |
Equity in the earnings of subsidiaries - change in the equity | R$ 7 |  |  |  |
Interest percentage | 30.00% | 30.00% |  | 30.00% |
Saneaqua Mairinque |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity | R$ 4,480 | R$ 4,090 |  | R$ 3,560 |
Provisioned dividends | 0 | 0 | [1] |  |
Provisioned dividends - change in the equity | 0 |  |  |  |
Profit for the year | 390 | 723 |  | 1,145 |
Profit for the year - change in the equity | (153) |  |  |  |
Investments | 1,298 | 1,227 |  |  |
Dividends distributed | 0 | 0 | [1] |  |
Dividends distributed - change in the equity | 0 |  |  |  |
Equity in the earnings of subsidiaries | 117 | R$ 217 |  | R$ 344 |
Equity in the earnings of subsidiaries - change in the equity | R$ (46) |  |  |  |
Interest percentage | 30.00% | 30.00% |  | 30.00% |
Attend Ambiental |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity | R$ 5,249 | R$ 3,925 |  | R$ 3,084 |
Provisioned dividends | 0 | 0 | [1] |  |
Provisioned dividends - change in the equity | 0 |  |  |  |
Profit for the year | 1,324 | 841 |  | 3,195 |
Profit for the year - change in the equity | (80) |  |  |  |
Investments | 2,326 | 1,766 |  |  |
Dividends distributed | 0 | 0 | [1] |  |
Dividends distributed - change in the equity | 0 |  |  |  |
Equity in the earnings of subsidiaries | 596 | R$ 378 |  | R$ 1,388 |
Equity in the earnings of subsidiaries - change in the equity | R$ (36) |  |  |  |
Interest percentage | 45.00% | 45.00% |  | 45.00% |
Aquapolo Ambiental |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity | R$ 18,810 | R$ 12,340 |  | R$ 11,651 |
Provisioned dividends | 0 | 0 | [1] |  |
Provisioned dividends - change in the equity | 0 |  |  |  |
Profit for the year | 6,470 | 689 |  | (4,569) |
Profit for the year - change in the equity | (53) |  |  |  |
Investments | 9,191 | 6,047 |  |  |
Dividends distributed | 0 | 0 | [1] |  |
Dividends distributed - change in the equity | 0 |  |  |  |
Equity in the earnings of subsidiaries | 3,170 | R$ 338 |  | R$ (2,239) |
Equity in the earnings of subsidiaries - change in the equity | R$ (26) |  |  |  |
Interest percentage | 49.00% | 49.00% |  | 49.00% |
Paulista Geradora de Energia |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Equity | R$ 8,447 | R$ 8,469 |  | R$ 8,509 |
Provisioned dividends | 0 | 0 | [1] |  |
Provisioned dividends - change in the equity | 0 |  |  |  |
Profit for the year | (22) | (40) |  | (114) |
Profit for the year - change in the equity | 0 |  |  |  |
Investments | 2,111 | 2,117 |  |  |
Dividends distributed | 0 | 0 | [1] |  |
Dividends distributed - change in the equity | 0 |  |  |  |
Equity in the earnings of subsidiaries | (6) | R$ (10) |  | R$ (29) |
Equity in the earnings of subsidiaries - change in the equity | R$ 0 |  |  |  |
Interest percentage | 25.00% | 25.00% |  | 25.00% |
Total |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Investments | R$ 36,344 | R$ 30,509 |  |  |
Dividends distributed | (231) | 306 | [1] |  |
Dividends distributed - change in the equity | 306 |  |  |  |
Equity in the earnings of subsidiaries | 6,473 | 4,740 |  | R$ 2,597 |
Equity in the earnings of subsidiaries - change in the equity | (713) |  |  |  |
Other investments |  |  |  |  |
SummaryOfInvestmentsLineItems [Line Items] |  |  |  |  |
Investments | R$ 588 | R$ 587 |  |  |
[1] | Refer to changes in the equity of investees, as their financial statements for the year ended December 31, 2016 were disclosed after disclosure of the Company's financial statements.

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