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COST METHOD INVESTMENT (Additional Information) (Details) BRL in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 BRL | Jun. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2017 BRL | Dec. 31, 2017 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2012 BRL
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest in Boa Vista Servicos S.A. |  |  |  | 1.00% |  |  |  |  |
Fair value Boa Vista Servicos S.A. | BRL 44 |  |  |  |  | BRL 44 | $ 13.5 | $ 14.1 |
Cost-method Investments, other than temporary impairment | BRL 46 | $ 14.8 | $ 0.0 | $ 0.0 | $ 14.8 |  |  |  |
Cumulative translation adjustment | $ |  |  |  |  |  |  | $ 37.0 |  |
Boa Vista Servicos S.A. |  |  |  |  |  |  |  |  |
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest in Boa Vista Servicos S.A. |  |  |  |  |  | 15.00% | 15.00% |  |
Investment in Boa Vista Servicos S.A. | BRL |  |  |  |  |  |  |  |  | BRL 130

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 + Details
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