Annual report pursuant to Section 13 and 15(d)

COST METHOD INVESTMENT (Additional Information) (Details)

v3.8.0.1
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