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Acquisitions - 2011 Acquisitions (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  | 0 Months Ended | 12 Months Ended | 32 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Earn-out Arrangements [Member] | Dec. 31, 2012 Earn-out Arrangements [Member] | Dec. 31, 2011 Earn-out Arrangements [Member] | May 02, 2011 EC Source [Member] | Jun. 30, 2011 EC Source [Member] | Dec. 31, 2013 EC Source [Member] | May 03, 2011 EC Source [Member] | May 03, 2011 EC Source [Member] Pre-Qualifications [Member] | Dec. 31, 2013 EC Source [Member] Investor [Member] | May 03, 2011 EC Source [Member] Investor [Member] | May 02, 2011 EC Source [Member] Earn-out Arrangements [Member] | Dec. 31, 2013 EC Source [Member] Earn-out Arrangements [Member] | Dec. 31, 2013 EC Source [Member] Earn-out Arrangements [Member] | May 03, 2011 EC Source [Member] Earn-out Arrangements [Member] | May 02, 2011 EC Source [Member] Common Stock [Member] | Dec. 31, 2013 EC Source [Member] Common Stock [Member] | May 03, 2011 EC Source [Member] Common Stock [Member] | Dec. 31, 2013 Other 2011 Acquisitions [Member] | Nov. 30, 2010 E C Source Services Llc Investee [Member] | May 02, 2011 Backlog [Member] EC Source [Member] | May 02, 2011 Non-compete Agreements [Member] EC Source [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |
Business acquisition, name of acquired entity |  |  |  |  |  |  |  |  | EC Source Services LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, description of acquired entity |  |  |  |  |  |  |  |  | a nationally recognized full-service engineering, procurement and construction services company that installs extra high voltage (“EHV”) electrical transmission systems throughout North America |  |  |  |  |  |  |  |  |  |  |  | Effective April 1, 2011, MasTec acquired a company based in western Canada that provides natural gas and petroleum pipeline infrastructure construction services, which is included in the Company's Oil and Gas segment. MasTec also purchased a company that provides telephone, cabling, engineering, construction, equipment integration, testing, wiring and computer network services to telecommunications carriers effective April 1, 2011, which is included in the Company's Communications segment. In addition, effective June 1, 2011, MasTec acquired a self-perform wireless infrastructure services company headquartered in California, which is included in the Company's communications segment. Effective June 30, 2011, MasTec also acquired an install-to-the-home contractor, which is included in the Company's Communications segment, that operates primarily in portions of New York, Pennsylvania and New England, and whose primary customer is DIRECTV®. |  |  |
Effective date of acquisition |  |  |  |  |  |  |  |  | May 02, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, percentage of voting interests acquired |  |  |  |  |  |  |  |  |  | 67.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, cumulative percentage ownership after all transactions |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity issued in business combination, number of shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,129,642 |  |  |  |  |  |
Equity issued in business combination, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 94,200,000 |  |  |  |
Acquisition payments in cash |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  | 29,971,000 | 66,700,000 | 48,111,000 |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |
Business combination, contingent consideration arrangements, basis for amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The earn-out is equal to 20% of the excess, if any, of EC Source’s EBITDA, as defined in the purchase agreement, over $15 million, payable annually at MasTec’s election in common stock, cash or a combination thereof. |  |  |  |  |  |  |  |  |
Business combination, equity interest issued or issuable, description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The MasTec shares issued on the effective date are subject to transfer restrictions, 25% of which lapsed on May 2, 2012, 25% of which lapsed on May 2, 2013, and 50% of which will lapse on May 2, 2014. |  |  |  |  |
Business combination, assumed debt | 9,800,000 | 20,600,000 |  |  |  |  |  |  |  |  |  | 2,600,000 | 8,600,000 |  |  |  |  |  |  |  |  |  |  |
Business combination, cost of acquired entity, equity interests issued and issuable, fair value method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The fair value of the shares transferred was based on MasTec’s quoted market price on the closing date, discounted by 10%, 15% and 20% for the estimated effect of the first, second and third year transfer restrictions, respectively. |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, percentage |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, fair value of equity investment |  |  |  |  |  |  | 39,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of equity interest in acquiree | 0 | 0 | 29,041,000 |  |  |  |  | 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, step acquisition, equity interest in acquiree, valuation techniques |  |  |  |  |  |  |  |  | The fair value of the equity investment was determined based on the implied consideration transferred as of the date of the business combination, discounted for the Company’s lack of control as a minority shareholder. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  |  |  |  |  |  |  | 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-amortizing intangible assets |  |  |  |  |  |  |  |  |  |  | 31,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 7 years
Business combination, goodwill recognized, description |  |  |  |  |  |  |  |  | Goodwill arising from the acquisition represents the estimated value of EC Source's geographic presence in key high growth markets, its assembled workforce, its management team's industry-specific project management expertise and synergies expected to be achieved from the combined operations of EC Source and MasTec. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, goodwill, expected tax deductible amount |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value measurements, significant assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The fair value of the earn-out obligation was estimated using an income approach and incorporates significant inputs not observable in the market. Key assumptions in the estimated valuation include the discount rate and probability-adjusted EBITDA projections. |  |  |  |  |  |  |  |  |
Business combination, contingent consideration arrangements, range of outcomes, value, low |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Business combination, contingent consideration arrangements, range of outcomes, value, high |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,000,000 |  |  |  |  |  |  |
Business combination, contingent consideration arrangements, range of outcomes, maximum unlimited |  |  |  |  |  |  |  |  |  |  |  |  |  |  | there is no maximum earn-out payment amount. |  |  |  |  |  |  |  |  |
Business combination, contingent consideration arrangements, earn-out payments |  |  |  | 18,683,000 | 33,936,000 | 44,714,000 |  |  |  |  |  |  |  |  |  | 7,800,000 |  |  |  |  |  |  |  |
Business combination, contingent consideration, liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,500,000 | $ 19,500,000 |  |  |  |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + 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 (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents a description of the basis for determining the amount of the payment recorded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages. + 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 (g)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + 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 (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, description of the valuation technique(s) used to measure the acquisition date fair value of the equity interest in the acquiree held by the acquirer immediately before the business combination and information that enables users of the acquirer's financial statements to assess the inputs used to develop the fair value measurement of the equity interest in the acquiree held by the acquirer immediately before the business combination. + 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 (g)(3,4) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Fair value of equity issued in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Description of significant assumptions used by management to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
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