Debt (Debt Guarantees and Covenants) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2014
Debt Instrument [Line Items]
Debt instrument, covenant compliance	MasTec was in compliance with the provisions and covenants of its outstanding debt instruments as of September 30, 2014 and December 31, 2013.
Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, guarantees	The Credit Facility is guaranteed by certain subsidiaries of the Company.
Senior Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt instrument, guarantees	The Company’s 4.875% Senior Notes, 2011 Convertible Notes and 2009 Convertible Notes are 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 Credit Facility or other outstanding indebtedness.
Senior Notes [Member] | Guarantor Subsidiaries [Member]
Debt Instrument [Line Items]
Guarantor subsidiaries, percentage of voting interests owned	100.00%