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Segments and Related Information (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
segment
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
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 | 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 includes equity investees and other small business units that perform construction and other services for a variety of international end-markets.    
General and administrative expenses $ 67,131   $ 63,798 $ 195,031 $ 207,077  
Other current assets 56,336     56,336   $ 68,190
Restructuring cost liability, current 6,400     6,400    
Held-for-Sale [Member]            
Segments and Related Information [Line Items]            
Other current assets 2,400     2,400    
General and Administrative Expense [Member]            
Segments and Related Information [Line Items]            
Restructuring charges 4,700     10,900    
Other Expense [Member]            
Segments and Related Information [Line Items]            
Restructuring charges       $ 2,900    
Corporate [Member] | Audit Committee Investigation [Member]            
Segments and Related Information [Line Items]            
General and administrative expenses     4,100   14,600  
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, distribution infrastructure for electrical utilities, among others.    
Business combinations, acquisition integration costs     1,200   17,800  
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.    
Oil and Gas [Member] | Canadian Dollars [Member]            
Segments and Related Information [Line Items]            
Restructuring charges       $ 6,500    
Oil and Gas [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member]            
Segments and Related Information [Line Items]            
Project losses   $ 13,500        
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.    
Restructuring charges 4,500     $ 7,300    
Electrical Transmission [Member] | Settled Litigation [Member]            
Segments and Related Information [Line Items]            
Court mandated mediation settlement, charge     12,200   12,200  
Electrical Transmission [Member] | Contracts Accounted for under Percentage-of-Completion [Member]            
Segments and Related Information [Line Items]            
Project losses   $ 15,100        
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 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     3,800   21,400  
Other [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Joint Venture [Member] | Pacer [Member]            
Segments and Related Information [Line Items]            
Project losses $ 5,100   $ 2,800 $ 5,100 $ 8,300