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IMPAIRMENT OF INVESTMENT IN BOA VISTA SERVICOS (Details) BRL in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 BRL | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 BRL | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 BRL
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |
Investment in Boa Vista Servicos S.A. (BVS) | BRL | BRL 44.0 |  |  |  | BRL 44.0 |  |  | BRL 90.0
Cost-method Investments, Other than Temporary Impairment | BRL 46.0 |  | $ 14.8 | $ 0.0 |  |  |  |
Cumulative Translation Adjustment |  |  |  |  |  | $ 36.4 |  |
Boa Vista Servicos Sociedad Anonima [Member] |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  | 15.00% | 15.00% |  |
Boa Vista Servicos Sociedad Anonima [Member] |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |
Investment in Boa Vista Servicos S.A. (BVS) |  |  |  |  |  | $ 11.1 | $ 14.1 |
Cost-method Investments, Other than Temporary Impairment |  | $ 14.8 |  |  |  |  |  |

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