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Acquisitions (2014 Acquisitions - WesTower) (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Oct. 01, 2014
Communications [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Business combinations, acquisition integration costs | $ 1,200,000 | $ 17,800,000 |  |
Communications [Member] | General and Administrative Expenses [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Business combinations, acquisition integration costs | $ 1,200,000 | $ 17,800,000 |  |
WesTower [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Business combinations, effective date |  | Oct. 01, 2014 |  |
Business combinations, percentage of voting interests acquired | 100.00% | 100.00% |  |
Business combinations, name of acquired entity |  | WesTower Communications Inc. (“WesTower”) |  |
Business combinations, description of acquired entity |  | WesTower is a telecommunications services firm focusing on construction and maintenance of communications infrastructure related to wireless networks throughout the United States. WesTower, which provides services to a number of major wireless carriers throughout the Eastern, Central and Western United States, is expected to expand the Company’s geographical presence, market penetration and skilled employee base within its existing wireless operations. |  |
Business combinations, goodwill recognized, description |  | Goodwill arising from the acquisition represents the estimated value of WesTower’s geographic presence in key high growth markets, its assembled workforce and synergies expected to be achieved from the combined operations of WesTower and MasTec. |  |
Business combinations, goodwill, expected tax deductible amount |  |  |  | $ 0
WesTower [Member] | Current Liabilities [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Business combinations, acquisition integration costs, current liabilities | $ 1,700,000 | $ 1,700,000 | $ 3,500,000 |
WesTower [Member] | Communications [Member] | General and Administrative Expenses [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Business combinations, acquisition integration costs |  | $ 9,300,000 |  |

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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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