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RELATED PARTY TRANSACTIONS: (Details)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Dec. 31, 2012
USD ($)
Sep. 30, 2013
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
USD ($)
Dec. 31, 2012
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
USD ($)
Sep. 30, 2012
Asarco LLC ("Asarco")
USD ($)
Sep. 30, 2013
Asarco LLC ("Asarco")
USD ($)
Sep. 30, 2012
Asarco LLC ("Asarco")
USD ($)
Dec. 31, 2012
Asarco LLC ("Asarco")
USD ($)
Sep. 30, 2013
Compania Perforadora Mexico S.A.P.I. de C.V.
USD ($)
Dec. 31, 2012
Compania Perforadora Mexico S.A.P.I. de C.V.
USD ($)
Sep. 30, 2013
Compania Minera Coimolache S.A.
USD ($)
Sep. 30, 2012
Compania Minera Coimolache S.A.
USD ($)
Sep. 30, 2013
Compania Minera Coimolache S.A.
USD ($)
Sep. 30, 2012
Compania Minera Coimolache S.A.
USD ($)
Dec. 31, 2012
Compania Minera Coimolache S.A.
USD ($)
Sep. 30, 2013
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Sep. 30, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Sep. 30, 2013
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Sep. 30, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Dec. 31, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Sep. 30, 2013
MGE
USD ($)
Mar. 31, 2012
MGE
USD ($)
Sep. 30, 2013
MGE
USD ($)
Dec. 31, 2012
MGE
USD ($)
Dec. 31, 2005
MGE
item
May 31, 2010
MGE
USD ($)
Dec. 31, 2012
MGE
Line of credit
USD ($)
Dec. 31, 2011
MGE
Line of credit
USD ($)
Mar. 31, 2012
MGE
Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
USD ($)
Mar. 31, 2012
MGE
Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
MXN
Sep. 30, 2013
Higher Technology S.A.C.
USD ($)
Sep. 30, 2012
Higher Technology S.A.C.
USD ($)
Dec. 31, 2012
Higher Technology S.A.C.
USD ($)
Sep. 30, 2013
Servicios y Fabricaciones Mecanicas S.A.C.
USD ($)
Sep. 30, 2012
Servicios y Fabricaciones Mecanicas S.A.C.
USD ($)
Sep. 30, 2013
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
USD ($)
Dec. 31, 2012
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
USD ($)
Dec. 31, 2007
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
Mexican subsidiaries
item
Sep. 30, 2013
Sempertrans
USD ($)
Sep. 30, 2012
Sempertrans
USD ($)
Sep. 30, 2013
Breaker, S.A. de C.V
USD ($)
Sep. 30, 2012
Breaker, S.A. de C.V
USD ($)
Sep. 30, 2013
PIGOBA, S.A. de C.V.
USD ($)
Sep. 30, 2012
PIGOBA, S.A. de C.V.
USD ($)
Sep. 30, 2013
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Sep. 30, 2012
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Dec. 31, 2012
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Sep. 30, 2013
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates
USD ($)
Sep. 30, 2012
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates
USD ($)
Sep. 30, 2013
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates
USD ($)
Sep. 30, 2012
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates
USD ($)
Sep. 30, 2012
Mextransport
USD ($)
Sep. 30, 2013
Mextransport
USD ($)
Sep. 30, 2012
Mextransport
USD ($)
Sep. 30, 2013
Grupo Mexico
item
Sep. 30, 2013
Mexico Generadora de Energia S.de R.L. ("MGE")
USD ($)
Sep. 30, 2013
Mexico Generadora de Energia S.de R.L. ("MGE")
USD ($)
Mar. 31, 2012
Mexico Generadora de Energia S.de R.L. ("MGE")
Minera Mexico
Maximum
Sep. 30, 2013
Grupo Mexico Servicios S.A de C.V
USD ($)
Sep. 30, 2012
Grupo Mexico Servicios S.A de C.V
USD ($)
RELATED PARTY TRANSACTIONS:                                                                                                                              
Related parties receivables, current: $ 30,434,000   $ 30,434,000   $ 25,740,000 $ 800,000 $ 1,800,000         $ 900,000 $ 500,000 $ 20,500,000   $ 20,500,000   $ 23,400,000                                                                                 $ 8,200,000 $ 8,200,000      
Related parties receivable, non-current: 161,244,000   161,244,000   183,950,000                                     161,200,000   161,200,000 184,000,000                                                                        
Related parties payables: 13,423,000   13,423,000   20,310,000 800,000     6,800,000   15,300,000               1,800,000   1,800,000   2,100,000                     100,000   200,000     300,000 100,000       200,000       3,400,000   2,600,000                          
Total purchases from related parties     155,600,000 100,400,000         82,000,000 33,000,000                     36,500,000 37,200,000                       1,700,000 2,300,000   200,000 100,000       1,000,000 100,000 2,700,000 1,800,000 100,000 500,000 14,900,000 10,700,000       4,100,000 2,200,000   2,000,000 2,000,000         10,400,000 10,500,000
Number of subsidiaries involved in Mexican operations                                                                                                                   3          
Number of power plants                                                       2                                                                      
Line of credit                                                         350,000,000                                                                    
Interest rate (as a percent)                               3.45%                 4.40%   5.75%                                                                        
Ownership percentage                           44.20%   44.20%                               99.999% 99.999%                                                       0.001%    
Value of interest acquired                                                               150,000,000 1,928,600,000                                                            
Loan repaid                           1,900,000   18,400,000                 150,000,000                                                                            
Loan granted                               56,600,000                           37,600,000 146,400,000                                                                
Number of loans guaranteed by subsidiaries                                                                                 2                                            
Basis of variable interest rate                               6 months Libor                                                                                              
Spread on variable interest rate (as a percent)                           3.00%   3.00%                                                                                              
Remaining balance at September 30, 2013                           20,500,000   20,500,000               161,200,000   161,200,000                                                                          
Interest earned                           200,000 500,000 800,000 1,500,000                                                                                   2,600,000 7,600,000      
Sales and other revenues from related parties               11,500,000 71,800,000 22,900,000                 200,000 100,000 600,000 300,000   10,900,000   11,600,000                                                 100,000 200,000 400,000 200,000 100,000 200,000 900,000            
Sales and total other revenues from related parties $ 11,200,000 $ 11,900,000 $ 84,600,000 $ 24,300,000