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Segments and Related Information (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment 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, the services of which vary from those provided by the Company’s primary segments, as well as other small business units that perform construction and other services for a variety of international end-markets.    
Segment reporting, transactions between reportable segments       Intercompany revenue and costs among the reportable segments are de minimis and accounted for as if the sales were to third parties because these items are based on negotiated fees between the segments involved. All intercompany transactions and balances are eliminated in consolidation. Intercompany revenue and costs between entities within a reportable segment are eliminated to arrive at segment totals. Eliminations between segments are separately presented.    
Segment reporting, additional information about entity's reportable segments       Segment results include certain allocations of centralized costs such as general liability, medical and workers’ compensation insurance and certain information technology costs. Income tax expense, which is recorded within corporate results, is managed on a consolidated basis and is not allocated to the reportable segments.    
Goodwill, pre-tax impairment charge (in dollars) $ 47,700     $ 47,662 $ 0 $ 0
Pacer [Member] | Joint Venture [Member]            
Segment and Related Information [Line Items]            
Project gains (in dollars)   $ 1,000   $ 1,000    
Project losses (in dollars)     $ 7,000   $ 7,900 5,100
Communications [Member]            
Segment 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.    
Goodwill, pre-tax impairment charge (in dollars)       $ 0    
Oil and Gas [Member]            
Segment 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.    
Goodwill, pre-tax impairment charge (in dollars)       $ 47,700    
Project losses (in dollars)           13,500
Restructuring charges (in dollars)           6,300
Electrical Transmission [Member]            
Segment 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.    
Goodwill, pre-tax impairment charge (in dollars)       $ 0    
Project losses (in dollars)           15,100
Restructuring charges (in dollars)           $ 8,900
Power Generation and Industrial [Member]            
Segment 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 power facilities, including renewables, related electrical transmission infrastructure, ethanol/biofuel facilities and various types of heavy civil and industrial infrastructure.    
Goodwill, pre-tax impairment charge (in dollars)       $ 0