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Segments and Related Information (Narrative) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Segments and Related Information [Line Items]    
Segment reporting information, factors used to identify entity's reportable segments MasTec manages its 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 5  
Number of reportable segments 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 includes equity investees, the services of which vary from those provided by the Company’s four primary segments, as well as other small business units that perform construction and other services for a variety of international end-markets.  
Joint Venture [Member] | Pacer [Member]    
Segments and Related Information [Line Items]    
Project gains | $ $ 1.0  
Project losses | $   $ 7.4
Communications [Member]    
Segments and Related Information [Line Items]    
Segment reporting information, description of products and services The Communications segment performs engineering, construction, maintenance and customer fulfillment activities related to communications infrastructure primarily for wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, infrastructure for utilities, among others.  
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/biofuel facilities and various types of heavy civil and industrial infrastructure.  
Primary Segments [Member]    
Segments and Related Information [Line Items]    
Number of operating segments 4