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STOCKHOLDERS' EQUITY: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 5 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 41 Months Ended 12 Months Ended
Oct. 31, 2011
Sep. 30, 2011
Aug. 31, 2011
Jun. 30, 2011
May 31, 2011
Dec. 31, 2008
Oct. 14, 2010
Sep. 30, 2009
Dec. 31, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
TREASURY STOCK:
Dec. 31, 2010
TREASURY STOCK:
Dec. 31, 2011
Minera Mexico
Dec. 31, 2011
Common Class A
TREASURY STOCK:
Dec. 31, 2010
Common Class A
TREASURY STOCK:
Dec. 31, 2009
Common Class A
TREASURY STOCK:
Dec. 31, 2011
Common Class B
TREASURY STOCK:
Dec. 31, 2010
Common Class B
TREASURY STOCK:
Dec. 31, 2009
Common Class B
TREASURY STOCK:
Activity in treasury stock                                          
Balance at the beginning of the period                 $ 622,722       $ 897,852 $ 622,722   $ 461,000 $ 460,712   $ 161,700 $ 142,700  
Purchase of shares 15,300 28,400 81,900 147,500 500 384,700 500 71,900 273,700 730,700           273,690 463 71,903      
Used for corporate purposes                               (534) (208) (159)      
Other activity, including dividend, interest and currency translation effect                                     1,974 19,054 17,216
Balance at the end of the period                 897,852 897,852     897,852 622,722   734,123 461,000 460,712 163,700 161,700 142,700
Treasury stock balance at the end of the period (in shares)                               43,616,086 34,596,086   897,800,000 622,700,000  
Appropriated Retained Earnings:                                          
Unremitted earnings of subsidiary (in dollars)                 $ 1,976,598 $ 1,976,598 $ 1,776,211 $ 1,776,255     $ 2,000,000