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RELATED PARTY TRANSACTIONS: (Details)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2012
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2012
Minera Mexico
Maximum
Jun. 30, 2013
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
USD ($)
Dec. 31, 2012
Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates
USD ($)
Jun. 30, 2013
Asarco LLC ("Asarco")
USD ($)
Jun. 30, 2012
Asarco LLC ("Asarco")
USD ($)
Jun. 30, 2013
Asarco LLC ("Asarco")
USD ($)
Jun. 30, 2012
Asarco LLC ("Asarco")
USD ($)
Dec. 31, 2012
Asarco LLC ("Asarco")
USD ($)
Jun. 30, 2013
Compania Perforadora Mexico S.A.P.I. de C.V.
USD ($)
Dec. 31, 2012
Compania Perforadora Mexico S.A.P.I. de C.V.
USD ($)
Apr. 02, 2013
Compania Minera Coimolache S.A.
USD ($)
Jun. 30, 2013
Compania Minera Coimolache S.A.
USD ($)
Jun. 30, 2012
Compania Minera Coimolache S.A.
USD ($)
Jun. 30, 2013
Compania Minera Coimolache S.A.
USD ($)
Jun. 30, 2012
Compania Minera Coimolache S.A.
USD ($)
Dec. 31, 2012
Compania Minera Coimolache S.A.
USD ($)
Jun. 30, 2013
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Jun. 30, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Jun. 30, 2013
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Jun. 30, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Dec. 31, 2012
Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates
USD ($)
Jun. 30, 2013
MGE
USD ($)
Mar. 31, 2012
MGE
USD ($)
Jun. 30, 2013
MGE
USD ($)
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 ($)
Mar. 31, 2012
MGE
Controladora de Infraestructura Energetica Mexico, S. A. de C. V.
MXN
Jun. 30, 2013
Higher Technology S.A.C.
USD ($)
Jun. 30, 2012
Higher Technology S.A.C.
USD ($)
Dec. 31, 2012
Higher Technology S.A.C.
USD ($)
Jun. 30, 2013
Servicios y Fabricaciones Mecanicas S.A.C.
USD ($)
Jun. 30, 2012
Servicios y Fabricaciones Mecanicas S.A.C.
USD ($)
Jun. 30, 2013
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
USD ($)
Dec. 31, 2012
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
USD ($)
Jun. 30, 2013
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
Mexican subsidiaries
USD ($)
Dec. 31, 2007
Mexico Transportes Aereos S.A. de C.V. ("Mextransport")
Mexican subsidiaries
item
Jun. 30, 2013
Sempertrans France Belting Technology
USD ($)
Jun. 30, 2013
Sempertrans Belchatow SP Z.O.O.
USD ($)
Jun. 30, 2013
Breaker, S.A. de C.V
USD ($)
Jun. 30, 2012
Breaker, S.A. de C.V
USD ($)
Jun. 30, 2013
Breaker Peru S.A.C.
USD ($)
Jun. 30, 2013
PIGOBA, S.A. de C.V.
USD ($)
Jun. 30, 2012
PIGOBA, S.A. de C.V.
USD ($)
Jun. 30, 2013
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Jun. 30, 2012
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Dec. 31, 2012
Ferrocarril Mexicano, S.A. de C.V.
USD ($)
Jun. 30, 2013
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates
USD ($)
Jun. 30, 2012
Compania Perforadora Mexico, S.A.P.I. de C.V and affiliates
USD ($)
Jun. 30, 2013
Mextransport
USD ($)
Jun. 30, 2012
Mextransport
USD ($)
Jun. 30, 2013
Mextransport
USD ($)
Jun. 30, 2012
Mextransport
USD ($)
Jun. 30, 2013
Cia Perforadora Mexico S.A.P.I. de C.V and affiliates
USD ($)
Jun. 30, 2013
Cia Perforadora Mexico S.A.P.I. de C.V and affiliates
USD ($)
Jun. 30, 2013
Grupo Mexico
item
Jun. 30, 2013
Mexico Generadora de Energia S.de R.L. ("MGE")
USD ($)
Jun. 30, 2013
Mexico Generadora de Energia S.de R.L. ("MGE")
USD ($)
Jun. 30, 2013
Grupo Mexico Servicios S.A de C.V
USD ($)
Jun. 30, 2012
Grupo Mexico Servicios S.A de C.V
USD ($)
RELATED PARTY TRANSACTIONS:                                                                                                                                        
Related parties receivable current: $ 33,669,000   $ 33,669,000   $ 25,740,000   $ 800,000 $ 1,800,000           $ 700,000 $ 500,000   $ 23,400,000   $ 23,400,000   $ 23,400,000                                                                                       $ 8,700,000 $ 8,700,000    
Related parties receivable non-current: 170,698,000   170,698,000   183,950,000                                           170,700,000   170,700,000 184,000,000                                                                            
Related parties payable: 7,800,000   7,800,000   20,300,000   2,700,000   400,000   400,000   15,300,000                 800,000   800,000   2,100,000                     100,000   200,000     300,000 100,000       300,000 100,000         3,100,000   2,600,000                          
Total purchases from related parties     123,100,000 61,000,000             70,700,000 16,400,000                       26,600,000 24,800,000                       1,000,000 1,500,000   100,000 100,000         200,000 300,000 1,800,000 1,200,000 200,000 100,000 100,000 11,100,000 7,400,000   2,600,000 1,100,000     1,500,000 1,500,000           6,900,000 6,900,000
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           0.001%                     44.20%   44.20%                               99.999% 99.999%                                                                
Value of interest acquired                                                                     150,000,000 1,928,600,000                                                                
Loan repaid                               16,500,000                       150,000,000                                                                                
Loan granted                                     56,600,000                           37,600,000 146,400,000                                                                    
Number of loans guaranteed by subsidiaries                                                                                         2                                              
Original loan balance                                                                                       8,500,000                                                
Basis of variable interest rate                                     6 months Libor                                                 Libor                                                
Spread on variable interest rate (as a percent)                                 3.00%   3.00%                                                 0.15%                                                
Remaining balance at June 30, 2013                                 25,300,000   25,300,000               170,700,000   170,700,000                             600,000                                                
Interest earned                                 200,000 600,000 600,000 1,100,000                                                                                         2,300,000 5,000,000    
Sales and other revenues from related parties                 35,200,000 400,000 71,800,000 11,400,000                   200,000 100,000 400,000 200,000   600,000   700,000                                                         100,000 100,000 200,000 800,000 200,000 300,000          
Sales and total other revenues from related parties $ 36,300,000 $ 600,000 $ 73,400,000 $ 12,400,000