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Earnings Per Share (Narrative) (Detail) (USD $) | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |  |  | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2012 Restricted Stock [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2012 Restricted Stock [Member] | Jun. 30, 2013 Convertible Debt [Member] Original 4.0% Notes [Member] | Jun. 30, 2012 Convertible Debt [Member] Original 4.0% Notes [Member] | Jun. 30, 2013 Convertible Debt [Member] New 4.0% Notes [Member] | Jun. 30, 2012 Convertible Debt [Member] New 4.0% Notes [Member] | Jun. 30, 2013 Convertible Debt [Member] New 4.0% Notes [Member] | Jun. 30, 2012 Convertible Debt [Member] New 4.0% Notes [Member] | Dec. 31, 2012 Convertible Debt [Member] New 4.0% Notes [Member] | Jun. 30, 2013 Convertible Debt [Member] Original 4.25% Notes [Member] | Jun. 30, 2012 Convertible Debt [Member] Original 4.25% Notes [Member] | Jun. 30, 2013 Convertible Debt [Member] New 4.25% Notes [Member] | Jun. 30, 2012 Convertible Debt [Member] New 4.25% Notes [Member] | Jun. 30, 2013 Convertible Debt [Member] New 4.25% Notes [Member] | Jun. 30, 2012 Convertible Debt [Member] New 4.25% Notes [Member] | Dec. 31, 2012 Convertible Debt [Member] New 4.25% Notes [Member] | Jun. 30, 2013 Convertible Debt [Member] Total New Senior Convertible Notes [Member] | Jun. 30, 2012 Convertible Debt [Member] Total New Senior Convertible Notes [Member] | Jun. 30, 2013 Convertible Debt [Member] Total New Senior Convertible Notes [Member] | Jun. 30, 2012 Convertible Debt [Member] Total New Senior Convertible Notes [Member] | Jun. 30, 2013 Convertible Debt [Member] Total Convertible Debt [Member]
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Computation of earnings per share, methodology | Basic earnings per share is computed by dividing earnings available to MasTec’s common shareholders by the weighted average number of common shares outstanding for the period. Diluted earnings per share is computed by dividing earnings by the number of fully diluted shares, which includes the effect of dilutive potential issuances of common shares as determined using earnings from continuing operations. The potential issuance of common shares upon the exercise, conversion or vesting, as applicable, of outstanding stock options and unvested restricted share awards, as calculated under the treasury stock method, as well as shares associated with the Company’s outstanding convertible debt securities, may be dilutive. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive common stock equivalents, shares |  |  |  |  |  | 123,077 | 136,158 | 61,878 | 1,066 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, amount authorized |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired, shares |  | 2,906,000 | [1] | 4,900,000 | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired, value |  |  |  | 75,000,000 | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 9,600,000 | [2] | $ 9,700,000 | [2] | $ 105,322,000 | [3] | $ 105,322,000 | [3] | $ 105,322,000 | [3] | $ 105,322,000 | [3] | $ 105,300,000 | $ 3,000,000 | [2] | $ 3,000,000 | [2] | $ 97,000,000 | [3] | $ 97,000,000 | [3] | $ 97,000,000 | [3] | $ 97,000,000 | [3] | $ 97,000,000 |  |  |  |  | $ 215,000,000
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  | 4.00% |  |  |  | 4.00% |  |  |  |  | 4.25% |  |  |  | 4.25% |  |  |  | 4.25% |  |  |  |  |  |  |  |  |
Debt instrument, convertible, number of conversion shares, principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,683,000 |  | 6,683,000 |  | 6,683,000 |  | 6,683,000 |  |  |  |  |  |  | 6,268,000 |  | 6,268,000 |  | 6,268,000 |  | 6,268,000 |  |  | 13,000,000 | 13,000,000 | 13,000,000 | 13,000,000 |
[1] | (1) See Note 2 - Earnings Per Share for share repurchase plan details.
[2] | Dilutive shares associated with the Original Convertible Notes are attributable to the underlying principal amounts.
[3] | Dilutive shares associated with the New Convertible Notes are attributable to the weighted average premium value, in shares, of the conversion shares underlying the New Convertible Notes in excess of the respective principal amounts thereof.

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