Debt - Guarantees and Covenants (Narrative) (Details)	9 Months Ended
	Sep. 30, 2013
Debt Instrument [Line Items]
Debt instrument, covenant compliance	MasTec was in compliance with all provisions and covenants pertaining to its outstanding debt instruments as of September 30, 2013 and December 31, 2012.
Total Senior And Senior Convertible Notes [Member] | Senior Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, guarantees	The Company’s 2011 Convertible Notes and 2009 Convertible Notes are, and, through March 29, 2013, the Company's 7.625% Senior Notes were, fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company's existing and future 100%-owned direct and indirect domestic subsidiaries that are guarantors of the Company's Credit Facility or other outstanding indebtedness. The Company's 4.875% Senior Notes are guaranteed on an unsecured, unsubordinated, joint and several basis by the Company's 100%-owned domestic subsidiaries that guarantee the Credit Facility.