RELATED PARTY TRANSACTIONS: (Details)			6 Months Ended			1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended								6 Months Ended		0 Months Ended	3 Months Ended		6 Months Ended			6 Months Ended			6 Months Ended					6 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended			6 Months Ended
	Jun. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2014 Grupo Mexico and affiliates USD ($)	Jun. 30, 2013 Grupo Mexico and affiliates USD ($)	Dec. 31, 2013 Grupo Mexico and affiliates USD ($)	May 31, 2010 MGE USD ($)	Mar. 31, 2012 MGE USD ($)	Jun. 30, 2014 MGE USD ($)	Jun. 30, 2013 MGE USD ($)	Dec. 31, 2012 MGE USD ($)	Dec. 31, 2005 MGE item	Dec. 31, 2013 MGE 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	Mar. 31, 2012 MGE Minera Mexico Maximum	Jun. 30, 2014 Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates USD ($)	Dec. 31, 2013 Compania Perforadora Mexico S.A.P.I. de C.V. and affiliates USD ($)	Jun. 30, 2014 Cia Perforadora Mexico S.A.P.I. de C.V and affiliates USD ($)	Jun. 30, 2013 Cia Perforadora Mexico S.A.P.I. de C.V and affiliates USD ($)	Apr. 02, 2013 Equity investment in affiliate USD ($)	Jun. 30, 2014 Equity investment in affiliate USD ($)	Jun. 30, 2013 Equity investment in affiliate USD ($)	Jun. 30, 2014 Equity investment in affiliate USD ($)	Jun. 30, 2013 Equity investment in affiliate USD ($)	Dec. 31, 2013 Equity investment in affiliate USD ($)	Jun. 30, 2014 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Jun. 30, 2013 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Dec. 31, 2013 Mexico Proyectos y Desarrollos, S.A. de C.V. and affiliates USD ($)	Jun. 30, 2014 Grupo Mexico and affiliates USD ($)	Jun. 30, 2013 Grupo Mexico and affiliates USD ($)	Jun. 30, 2014 Asarco LLC ("Asarco") USD ($)	Jun. 30, 2013 Asarco LLC ("Asarco") USD ($)	Dec. 31, 2013 Asarco LLC ("Asarco") USD ($)	Jun. 30, 2014 Higher Technology S.A.C. USD ($)	Jun. 30, 2013 Higher Technology S.A.C. USD ($)	Dec. 31, 2013 Higher Technology S.A.C. USD ($)	Jun. 30, 2014 Breaker, S.A. de C.V and affiliates ("Breaker") USD ($)	Jun. 30, 2013 Breaker, S.A. de C.V and affiliates ("Breaker") USD ($)	Dec. 31, 2013 Breaker, S.A. de C.V and affiliates ("Breaker") USD ($)	Jun. 30, 2014 Sempertrans and affiliates USD ($)	Jun. 30, 2013 Sempertrans and affiliates USD ($)	Dec. 31, 2013 Sempertrans and affiliates USD ($)	Jun. 30, 2014 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($)	Jun. 30, 2013 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($)	Dec. 31, 2013 Mexico Transportes Aereos S.A. de C.V. ("Mextransport") USD ($)	Jun. 30, 2014 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Jun. 30, 2013 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Dec. 31, 2013 Ferrocarril Mexicano, S.A. de C.V. USD ($)	Jun. 30, 2014 Servicios y Fabricaciones Mecanicas S.A.C. USD ($)	Jun. 30, 2013 Servicios y Fabricaciones Mecanicas S.A.C. USD ($)	Jun. 30, 2014 Companies with relationship with SCC executive officers' families USD ($)	Jun. 30, 2013 Companies with relationship with SCC executive officers' families USD ($)	Jun. 30, 2014 Pigoba S.A. de C.V. USD ($)	Jun. 30, 2013 Pigoba S.A. de C.V. USD ($)
Related party transactions
Related parties receivables current:	$ 10,832,000	$ 38,062,000	$ 900,000		$ 800,000							$ 18,800,000				$ 1,000,000	$ 700,000				$ 5,600,000		$ 5,600,000		$ 17,200,000	$ 3,300,000		$ 600,000
Related parties receivable non-current:	161,244,000	161,244,000						161,200,000		184,000,000		161,200,000
Related parties payables:	24,994,000	28,373,000	6,100,000		3,300,000			9,900,000				14,400,000														100,000					6,100,000		6,200,000	100,000		100,000	1,100,000		300,000	100,000		100,000	300,000		600,000	1,200,000		3,300,000
Total purchases from related parties			192,600,000	117,900,000				91,700,000										1,900,000	2,600,000							55,900,000	26,600,000		6,900,000	6,900,000	24,600,000	70,700,000		800,000	1,000,000		3,600,000	2,000,000		800,000	500,000		1,100,000	1,500,000		11,600,000	11,100,000		700,000	100,000	6,000,000	3,700,000	100,000	100,000
Sales revenues from related parties			71,200,000	73,200,000				48,800,000	700,000									300,000	300,000							400,000	400,000				21,700,000	71,800,000											100,000	200,000
Number of power plants											2
Maximum amount of line of credit granted to related party						350,000,000
Interest rate (as a percent)						4.40%				5.75%													3.35%
Percentage of interest acquired													99.999%	99.999%
Value of interest acquired													150,000,000	1,928,600,000
Ownership percentage															0.001%
Loan repaid							150,000,000													16,500,000
Loan granted																							56,600,000
Interest earned								4,700,000	5,000,000												100,000	200,000	200,000	600,000
Outstanding amount																					$ 5,600,000		$ 5,600,000
Ownership percentage																					44.20%		44.20%
Basis of variable interest rate																							6 months Libor
Spread on variable interest rate (as a percent)																							3.00%