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INCOME TAXES: (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
U.S. federal and state:      
Current $ (100,000) $ (2,400,000) $ (11,200,000)
Deferred (108,600,000) (45,300,000) 6,200,000
Uncertain tax positions 147,400,000 (400,000) 34,800,000
Provision for income taxes 38,700,000 (48,100,000) 29,800,000
Foreign (Peru and Mexico):      
Current 1,025,100,000 1,238,700,000 843,500,000
Deferred 17,100,000 (86,300,000) (5,200,000)
Provision for income taxes 1,042,200,000 1,152,400,000 838,300,000
Total provision for income taxes 1,080,872,000 1,104,335,000 868,071,000
Earnings by location:      
U.S. (100,000) (1,100,000) (1,000,000)
Peru 846,000,000 1,351,900,000 1,544,700,000
Mexico 2,127,600,000 2,097,900,000 887,100,000
Foreign 2,973,600,000 3,449,800,000 2,431,800,000
Income before income taxes $ 2,973,542,000 $ 3,448,688,000 $ 2,430,780,000