RELATED PARTY TRANSACTIONS: (Details)			12 Months Ended																		1 Months Ended	3 Months Ended	12 Months Ended								12 Months Ended																												12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2013 Grupo Mexico and its affiliates USD ($)	Dec. 31, 2012 Grupo Mexico and its affiliates USD ($)	Dec. 31, 2011 Grupo Mexico and its affiliates USD ($)	Dec. 31, 2013 Grupo Mexico USD ($)	Dec. 31, 2012 Grupo Mexico USD ($)	Dec. 31, 2011 Grupo Mexico USD ($)	Dec. 31, 2013 Asarco LLC ("Asarco") USD ($)	Dec. 31, 2012 Asarco LLC ("Asarco") USD ($)	Dec. 31, 2011 Asarco LLC ("Asarco") USD ($)	Dec. 31, 2013 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Dec. 31, 2012 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Dec. 31, 2011 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Dec. 31, 2013 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Dec. 31, 2012 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Dec. 31, 2011 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Dec. 31, 2013 Compania Perforadora Mexico S.A.P.I. de C.V. USD ($)	Dec. 31, 2012 Compania Perforadora Mexico S.A.P.I. de C.V. USD ($)	Dec. 31, 2011 Compania Perforadora Mexico S.A.P.I. de C.V. USD ($)	May 31, 2010 MGE USD ($)	Mar. 31, 2012 MGE USD ($)	Dec. 31, 2013 MGE USD ($)	Dec. 31, 2012 MGE USD ($)	Dec. 31, 2005 MGE item	Dec. 31, 2012 MGE Line of credit USD ($)	Dec. 31, 2011 MGE Line of credit USD ($)	Mar. 31, 2012 MGE Maximum	Mar. 31, 2012 MGE Controladora de Infraestructura Energetica Mexico, S. A. de C. V. USD ($)	Mar. 31, 2012 MGE Controladora de Infraestructura Energetica Mexico, S. A. de C. V. MXN	Dec. 31, 2013 Companies with relationship to the controlling group USD ($)	Dec. 31, 2012 Companies with relationship to the controlling group USD ($)	Dec. 31, 2011 Companies with relationship to the controlling group USD ($)	Dec. 31, 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, 2011 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($)	Dec. 31, 2007 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") Mexican subsidiaries item	Dec. 31, 2011 Mexico Compania de Productos Automotrices, S.A. de C.V. USD ($)	Dec. 31, 2013 Companies with relationship to SCC executive officers' families USD ($)	Dec. 31, 2012 Companies with relationship to SCC executive officers' families USD ($)	Dec. 31, 2011 Companies with relationship to SCC executive officers' families USD ($)	Dec. 31, 2013 Higher Technology S.A.C. USD ($)	Dec. 31, 2012 Higher Technology S.A.C. USD ($)	Dec. 31, 2011 Higher Technology S.A.C. USD ($)	Dec. 31, 2013 Servicios y Fabricaciones Mecanicas S.A.C. USD ($)	Dec. 31, 2012 Servicios y Fabricaciones Mecanicas S.A.C. USD ($)	Dec. 31, 2011 Servicios y Fabricaciones Mecanicas S.A.C. USD ($)	Dec. 31, 2013 Sempertrans USD ($)	Dec. 31, 2012 Sempertrans USD ($)	Dec. 31, 2011 Sempertrans USD ($)	Dec. 31, 2013 PIGOBA, S.A. de C.V. USD ($)	Dec. 31, 2012 PIGOBA, S.A. de C.V. USD ($)	Dec. 31, 2011 PIGOBA, S.A. de C.V. USD ($)	Dec. 31, 2013 Breaker, S.A. de C.V USD ($)	Dec. 31, 2012 Breaker, S.A. de C.V USD ($)	Dec. 31, 2011 Breaker, S.A. de C.V USD ($)	Dec. 31, 2013 Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates USD ($)	Dec. 31, 2012 Grupo Mexico, S.A.B de C.V. ( Grupo Mexico ) and affiliates USD ($)	Dec. 31, 2013 Equity investment in affiliate USD ($)	Dec. 31, 2012 Equity investment in affiliate USD ($)	Dec. 31, 2013 Sempertrans and affiliates USD ($)
Related party transactions
Related parties receivables current:	$ 38,062,000	$ 25,740,000													$ 600,000			$ 700,000	$ 500,000				$ 18,800,000																																		$ 800,000	$ 1,800,000	$ 17,200,000	$ 23,400,000
Related parties receivable non-current:	161,244,000	183,950,000																					161,200,000	184,000,000
Related parties payables:	28,373,000	20,310,000							6,200,000	15,300,000		3,300,000	2,600,000			2,100,000							14,400,000											600,000	100,000							100,000	200,000											300,000			3,300,000				100,000
Total purchases from related parties			206,400,000	138,100,000	88,900,000	13,800,000	13,900,000	13,900,000	98,000,000	58,600,000	23,400,000	19,700,000	13,900,000	11,600,000	54,400,000	49,500,000	38,200,000	6,100,000	2,200,000	1,800,000			14,400,000								2,700,000	2,700,000	3,000,000	2,700,000	2,700,000	2,800,000		200,000	7,900,000	6,700,000	8,200,000	2,200,000	3,100,000	1,900,000	400,000	200,000	600,000	1,100,000	300,000	200,000	300,000	800,000	200,000	3,900,000	2,300,000	5,300,000
Sales revenues from related parties									88,700,000	23,500,000	68,800,000				800,000	500,000	500,000	600,000		200,000			27,300,000											300,000	900,000
Total sales revenues from related parties			117,400,000	24,000,000	69,500,000
Number of power plants																									2
Line of credit																					350,000,000
Interest rate (as a percent)																					4.40%			5.75%																																			3.35%
Ownership percentage																												0.001%	99.999%	99.999%																													44.20%
Value of interest acquired																													150,000,000	1,928,600,000
Loan repaid																						150,000,000																																					18,400,000
Loan granted																										37,600,000	146,400,000																																56,600,000
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%
Remaining balance at December 31, 2013																																																											17,200,000
Interest earned																							$ 9,900,000																																				$ 900,000	$ 1,900,000