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IMPAIRMENT OF INVESTMENT IN BOA VISTA SERVICOS (Details) BRL in Millions, $ in Millions | Jun. 30, 2016 BRL | Jun. 30, 2016 USD ($) | Dec. 31, 2015 BRL
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Schedule of Cost-method Investments [Line Items] |  |  |
Investment in Boa Vista Servicos S.A. (BVS) | BRL 44 | $ 13.0 | BRL 44
Cumulative Translation Adjustment |  | $ 37.5 |
Boa Vista Servicos Sociedad Anonima |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |
Business acquisition, percentage of voting interests acquired | 15.00% | 15.00% |

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