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Segments and Related Information (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
segment
Jun. 30, 2014
USD ($)
Segments and Related Information [Line Items]          
Segment reporting information, factors used to identify entity's reportable segments       MasTec manages its continuing operations under five operating segments, which represent MasTec’s five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial and (5) Other. This structure is generally focused on broad end-user markets for MasTec’s labor-based construction services.  
Number of operating segments | segment       5  
Number of reportable segments | segment       5  
Segment reporting information, description of products and services       All five reportable segments derive their revenue from the engineering, installation and maintenance of infrastructure, primarily in North America.  
Segment reporting, description of all other segments       The Other segment primarily includes a proportionately consolidated joint venture and other small business units that perform construction services for a variety of end-markets in Canada, Mexico and elsewhere internationally.  
General and administrative expenses $ 69,250   $ 54,237 $ 143,279 $ 107,564
Corporate [Member] | Audit Committee Independent Investigation [Member]          
Segments and Related Information [Line Items]          
General and administrative expenses 6,700     $ 9,700  
Communications [Member]          
Segments and Related Information [Line Items]          
Segment reporting information, description of products and services       The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for electrical utilities.  
Business combinations, acquisition integration costs $ 7,800     $ 16,600  
Oil and Gas [Member]          
Segments and Related Information [Line Items]          
Segment reporting information, description of products and services       MasTec performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through its Oil and Gas segment.  
Electrical Transmission [Member]          
Segments and Related Information [Line Items]          
Segment reporting information, description of products and services       The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations.  
Power Generation and Industrial [Member]          
Segments and Related Information [Line Items]          
Segment reporting information, description of products and services       The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol facilities and various types of industrial infrastructure.  
Power Generation and Industrial [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member]          
Segments and Related Information [Line Items]          
Project losses   $ 16,000   $ 16,000  
Other [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Pacer [Member] | Joint Venture [Member]          
Segments and Related Information [Line Items]          
Project losses   $ 5,500   $ 5,500