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Acquisitions - 2012 Acquisitions (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended |  | 12 Months Ended
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Dec. 31, 2013 Earn-out Arrangements [Member] | Dec. 31, 2012 Earn-out Arrangements [Member] | Dec. 31, 2011 Earn-out Arrangements [Member] | Dec. 01, 2012 Bottom Line Services [Member] | Dec. 31, 2013 Bottom Line Services [Member] | Dec. 02, 2012 Bottom Line Services [Member] | Dec. 01, 2012 Bottom Line Services [Member] Earn-out Arrangements [Member] | Dec. 02, 2012 Bottom Line Services [Member] Earn-out Arrangements [Member] | Dec. 31, 2013 Other 2012 Acquisitions [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Effective date of acquisition |  |  |  |  | Dec. 01, 2012 |  |  |  |
Business combination, percentage of voting interests acquired |  |  |  |  |  | 100.00% |  |  |
Business acquisition, name of acquired entity |  |  |  |  | Bottom Line Services, LLC |  |  |  |
Business acquisition, description of acquired entity |  |  |  |  | BLS, which is included in the Company's Oil and Gas segment, provides pipeline and facilities construction, painting and maintenance services, primarily in eastern Texas. |  |  |  | MasTec acquired a former subcontractor to MasTec's oil and gas business, which provides self-perform clearing and trenching services for natural gas and petroleum pipeline infrastructure construction and is included in the Company's Oil and Gas segment. MasTec also acquired a former subcontractor to MasTec's wireless business, which provides self-perform communications tower construction, installation, maintenance and other services in support of telecommunications infrastructure construction and is included in the Company's Communications segment.
Acquisition payments in cash |  |  |  | $ 67,600,000 |  |  |  |  |
Earn-out period |  |  |  |  |  |  |  | 5 years |
Estimated fair value of contingent consideration | $ 29,971,000 | $ 66,700,000 | $ 48,111,000 |  |  |  | $ 11,100,000 |  |

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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=25497992&loc=d3e1392-128463 + Details
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