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Earnings Per Share (Narrative) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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 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 | 0 | 8,313 | 9,479
Unsecured Debt [Member] | Convertible Debt [Member] | Total Convertible Debt [Member] |  |  |
Earnings Per Share [Line Items] |  |  |
Principal amount | $ 215,000,000 |  |
Unsecured Debt [Member] | Convertible Debt [Member] | 2011 Senior Convertible Notes [Member] |  |  |
Earnings Per Share [Line Items] |  |  |
Principal amount | 202,300,000 |  |
Computation of earnings per share, methodology | Due to the optional cash settlement feature and the Company's intent to settle the principal amount in cash, the conversion shares underlying the outstanding principal amount of the 2011 Convertible Notes, totaling approximately 13.0 million shares, are not required to be included in the Company's diluted share count. If, however, the average price per share of the Company's common stock exceeds the respective conversion prices of the 2011 Convertible Notes, the resulting amount, in shares, of any premium is required to be included in the Company's diluted share count, also referred to as premium shares. |  |
Number of conversion shares, principal amount | 13,000,000 |  |
Unsecured Debt [Member] | Convertible Debt [Member] | 2009 Senior Convertible Notes [Member] |  |  |
Earnings Per Share [Line Items] |  |  |
Principal amount | 12,600,000 |  |
Computation of earnings per share, methodology | Dilutive shares associated with the 2009 Convertible Notes are attributable to the underlying principal amounts. The number of common shares issuable upon conversion of the Company’s 2009 Convertible Notes is reflected in the calculation of weighted average diluted earnings per share for the corresponding periods by application of the “if-converted” method to the extent their effect on the computation of earnings per share from continuing operations is dilutive. Under the “if-converted” method, net income from continuing operations is adjusted to add back the after-tax amount of interest recognized in the period associated with the convertible notes, and correspondingly, the convertible notes are assumed to have been converted with the resulting common shares added to weighted average shares outstanding. |  |
Unsecured Debt [Member] | Convertible Debt [Member] | 2011 4.0% Notes [Member] |  |  |
Earnings Per Share [Line Items] |  |  |
Principal amount | 105,300,000 |  |
Number of conversion shares, principal amount | 6,683,000 | 6,683,000 | 6,683,000
Debt instrument, interest rate | 4.00% |  |
Conversion price per share | $ 15.76 |  |
Unsecured Debt [Member] | Convertible Debt [Member] | 2011 4.25% Notes [Member] |  |  |
Earnings Per Share [Line Items] |  |  |
Principal amount | $ 97,000,000 |  |
Number of conversion shares, principal amount | 6,268,000 | 6,268,000 | 6,268,000
Debt instrument, interest rate | 4.25% |  |
Conversion price per share | $ 15.48 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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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 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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