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Earnings Per Share (Narrative) (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |
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Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2013 Restricted Stock [Member] | Mar. 31, 2012 Restricted Stock [Member] | Mar. 31, 2013 Convertible Debt [Member] Original 4.0% Notes [Member] | Mar. 31, 2012 Convertible Debt [Member] Original 4.0% Notes [Member] | Mar. 31, 2013 Convertible Debt [Member] New 4.0% Notes [Member] | Mar. 31, 2012 Convertible Debt [Member] New 4.0% Notes [Member] | Mar. 31, 2013 Convertible Debt [Member] Original 4.25% Notes [Member] | Mar. 31, 2012 Convertible Debt [Member] Original 4.25% Notes [Member] | Mar. 31, 2013 Convertible Debt [Member] New 4.25% Notes [Member] | Mar. 31, 2012 Convertible Debt [Member] New 4.25% Notes [Member] | Mar. 31, 2013 Convertible Debt [Member] Total New Senior Convertible Notes [Member] | Mar. 31, 2012 Convertible Debt [Member] Total New Senior Convertible Notes [Member] | Mar. 31, 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. Potentially dilutive common shares include 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. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Anti-dilutive common stock equivalents, shares |  |  |  | 0 | 10,962 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, amount authorized |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired, shares |  | 4,900,000 | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock acquired, value |  | 75,000,000 | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, outstanding principal amount |  |  |  |  |  | $ 9,600,000 | [1] | $ 9,700,000 | [1] | $ 105,322,000 | [2] | $ 105,322,000 | [2] | $ 3,000,000 | [1] | $ 3,000,000 | [1] | $ 97,000,000 | [2] | $ 97,000,000 | [2] |  |  | $ 215,000,000
Debt instrument, interest rate |  |  |  |  |  | 4.00% |  |  |  | 4.00% |  |  |  | 4.25% |  |  |  | 4.25% |  |  |  |  |  |
Debt instrument, convertible, number of conversion shares, principal amount |  |  |  |  |  |  |  |  |  | 6,683,000 |  | 6,683,000 |  |  |  |  |  | 6,268,000 |  | 6,268,000 |  | 13,000,000 | 13,000,000 |
Debt instrument, convertible, conversion price per share |  |  |  |  |  |  |  |  |  | $ 15.76 |  | $ 15.76 |  |  |  |  |  | $ 15.48 |  | $ 15.48 |  |  |  |
[1] | Dilutive shares associated with the Original Convertible Notes are attributable to the underlying principal amounts.
[2] | Dilutive shares associated with the New Convertible Notes are attributable to the premium over the respective conversion prices.

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- Definition Disclosure of the methodology and assumptions used in the reconciliation of earnings per share, which may include the individual income and share amount effects of all securities that affect earnings per share, the effect that has been given to preferred dividends in arriving at income available to common stockholders in computing basic earnings per share, securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic EPS in the future that were not included in the computation of diluted EPS because to do so would have been antidilutive for the period(s) presented and a description of any transaction that occurs after the end of the most recent period but before issuance of the financial statements that would have changed materially the number of common shares or potential common shares outstanding at the end of the period if the transaction had occurred before the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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