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Earnings Per Share (Schedule Of Earnings Per Share, Basic and Diluted) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Net Income (Loss) Available to Common Stockholders, Basic |  |  |  |
Net income from continuing operations | $ 19,317 |  | $ 11,695 |
Net (loss) income from discontinued operations | (947) |  | 2,477 |
Net income attributable to MasTec, Inc. | 18,370 |  | 14,172 |
Weighted Average Number of Shares Outstanding, Basic |  |  |  |
Weighted average shares outstanding | 76,608 |  | 80,615 |
Earnings (Loss) Per Share, Basic |  |  |  |
Basic earnings per share, continuing operations | $ 0.25 |  | $ 0.15 |
Basic (loss) earnings per share, discontinued operations | $ (0.01) |  | $ 0.03 |
Total basic earnings per share | $ 0.24 | [1] | $ 0.18 | [1]
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |
Net income from continuing operations | 19,317 |  | 11,695 |
Diluted net income from continuing operations | 19,394 |  | 11,772 |
Net (loss) income from discontinued operations | (947) |  | 2,477 |
Diluted net income attributable to MasTec | 18,447 |  | 14,249 |
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |
Weighted average shares outstanding | 76,608 |  | 80,615 |
Dilutive common stock equivalents | 785 |  | 813 |
Diluted weighted average shares outstanding | 84,094 |  | 83,901 |
Earnings (Loss) Per Share, Diluted |  |  |  |
Diluted earnings per share, continuing operations | $ 0.23 |  | $ 0.14 |
Diluted (loss) earnings per share, discontinued operations | $ (0.01) |  | $ 0.03 |
Total diluted earnings per share | $ 0.22 | [1] | $ 0.17 | [1]
Convertible Debt [Member] | Original 4.0% Notes [Member] |  |  |  |
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |
Interest expense on convertible debt, net of tax | 58 |  | 58 |
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |
Dilutive shares | 612 |  | 612 |
Convertible Debt [Member] | Original 4.25% Notes [Member] |  |  |  |
Net Income (Loss) Available to Common Stockholders, Diluted |  |  |  |
Interest expense on convertible debt, net of tax | $ 19 |  | $ 19 |
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |
Dilutive shares | 194 |  | 194 |
Convertible Debt [Member] | New 4.0% Notes [Member] |  |  |  |
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |
Dilutive premium shares | 3,010 |  | 809 |
Convertible Debt [Member] | New 4.25% Notes [Member] |  |  |  |
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |
Dilutive premium shares | 2,885 |  | 858 |
[1] | Earnings per share tables may contain summation differences due to rounding.

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