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Segments and Related Information (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) segment | Sep. 30, 2014 USD ($)
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 (in dollars) | $ 63,798 | $ 59,889 | $ 207,077 | $ 167,454
Corporate [Member] | Audit Committee Independent Investigation [Member] |  |  |  |
Segments and Related Information [Line Items] |  |  |  |
General and administrative expenses (in dollars) | 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 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 (in dollars) | 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. |
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. |
Electrical Transmission [Member] | PPL [Member] | Settled Litigation [Member] | Other Expense [Member] |  |  |  |
Segments and Related Information [Line Items] |  |  |  |
Court mandated mediation settlement, charge (in dollars) | 12,200 |  | $ 12,200 |
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 (in dollars) | 3,800 |  | $ 21,400 |
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 (in dollars) | $ 2,800 |  | $ 8,300 |

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