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STOCKHOLDERS' EQUITY: (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended 90 Months Ended
Apr. 30, 2015
Mar. 31, 2015
Feb. 28, 2015
Jan. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2015
Activity in treasury stock                        
Balance at the beginning of the period       $ 1,900,686   $ 1,900,686 $ 1,900,686          
Purchase of shares $ 44,500 $ 133,100 $ 76,300 160,700 $ 44,500 370,100     $ 682,800 $ 281,400 $ 878,100 $ 2,256,900
Balance at the end of the period         2,312,401   $ 2,312,401 $ 1,290,600 1,900,686     2,312,401
Southern copper common shares | Directors' Stock Award Plan                        
Share Based Compensation Plan, share distributions                        
Share Based Compensation Plan, share distributions during the period             13,200 12,000        
Parent Company (Grupo Mexico) common shares | Employee Stock Purchase Plan                        
Share Based Compensation Plan, share distributions                        
Share Based Compensation Plan, share distributions during the period             200,000 700,000        
TREASURY STOCK: | Southern copper common shares                        
Activity in treasury stock                        
Balance at the beginning of the period       1,693,500   1,693,500 $ 1,693,500 $ 1,011,000 1,011,000      
Purchase of shares             414,600 65,500        
Used for corporate purposes             (400) (300)        
Balance at the end of the period         $ 2,107,700   $ 2,107,700 $ 1,076,200 1,693,500 1,011,000   $ 2,107,700
Treasury stock balance at the end of the period (in shares)         86,556,843   86,556,843 51,591,147       86,556,843
TREASURY STOCK: | Parent Company (Grupo Mexico) common shares                        
Activity in treasury stock                        
Balance at the beginning of the period       $ 207,200   $ 207,200 $ 207,200 $ 205,600 205,600      
Other activity, including dividend, interest and currency translation effect             (2,500) 8,800        
Balance at the end of the period         $ 204,700   $ 204,700 $ 214,400 $ 207,200 $ 205,600   $ 204,700
Treasury stock balance at the end of the period (in shares)         93,837,013   93,837,013 72,078,019       93,837,013