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Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Assets |  |  |  |
Current assets | $ 1,145,749 | $ 1,047,365 |  |
Current assets of discontinued operations | 20,091 | 18,591 |  |
Property and equipment, net | 383,174 | 350,378 |  |
Goodwill and other intangible assets, net | 956,899 | 961,807 | 822,700 | 825,500
Net investments in and advances to (from) consolidated affilliates | 0 | 0 |  |
Other assets | 47,374 | 45,421 |  |
Long-term assets of discontinued operations | 7,670 | 7,648 |  |
Total assets | 2,540,866 | 2,412,619 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 691,729 | 710,386 |  |
Current liabilities of discontinued operations | 2,508 | 4,569 |  |
Long-term debt | 685,390 | 546,323 |  |
Other liabilities | 278,092 | 293,975 |  |
Total liabilities | 1,655,211 | 1,550,684 |  |
Total shareholders' equity | 885,655 | 861,935 |  |
Total liabilities and shareholders' equity | 2,540,866 | 2,412,619 |  |
Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 1,125,658 | 1,028,774 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 689,221 | 705,817 |  |
MasTec, Inc. [Member] |  |  |  |
Assets |  |  |  |
Current assets of discontinued operations | 0 | 0 |  |
Property and equipment, net | 0 | 0 |  |
Goodwill and other intangible assets, net | 0 | 0 |  |
Net investments in and advances to (from) consolidated affilliates | 878,886 | 854,993 |  |
Other assets | 8,112 | 7,702 |  |
Long-term assets of discontinued operations | 0 | 0 |  |
Total assets | 886,998 | 862,695 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities of discontinued operations | 0 | 0 |  |
Long-term debt | 0 | 0 |  |
Other liabilities | 0 | 0 |  |
Total liabilities | 5 | 22 |  |
Total shareholders' equity | 886,993 | 862,673 |  |
Total liabilities and shareholders' equity | 886,998 | 862,695 |  |
MasTec, Inc. [Member] | Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 0 | 0 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 5 | 22 |  |
Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Current assets of discontinued operations | 13,204 | 13,836 |  |
Property and equipment, net | 372,492 | 338,997 |  |
Goodwill and other intangible assets, net | 927,086 | 931,078 |  |
Net investments in and advances to (from) consolidated affilliates | 205,786 | 172,534 |  |
Other assets | 39,192 | 37,639 |  |
Long-term assets of discontinued operations | 4,711 | 4,711 |  |
Total assets | 2,609,931 | 2,479,196 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities of discontinued operations | 0 | 574 |  |
Long-term debt | 685,340 | 546,262 |  |
Other liabilities | 262,122 | 273,199 |  |
Total liabilities | 1,613,998 | 1,503,020 |  |
Total shareholders' equity | 995,933 | 976,176 |  |
Total liabilities and shareholders' equity | 2,609,931 | 2,479,196 |  |
Guarantor Subsidiaries [Member] | Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 1,047,460 | 980,401 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 666,536 | 682,985 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Current assets of discontinued operations | 6,887 | 4,755 |  |
Property and equipment, net | 10,682 | 11,381 |  |
Goodwill and other intangible assets, net | 29,813 | 30,729 |  |
Net investments in and advances to (from) consolidated affilliates | (54,307) | (21,779) |  |
Other assets | 70 | 80 |  |
Long-term assets of discontinued operations | 2,959 | 2,937 |  |
Total assets | 74,302 | 76,476 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities of discontinued operations | 2,508 | 3,995 |  |
Long-term debt | 50 | 61 |  |
Other liabilities | 15,970 | 20,776 |  |
Total liabilities | 41,208 | 47,642 |  |
Total shareholders' equity | 33,094 | 28,834 |  |
Total liabilities and shareholders' equity | 74,302 | 76,476 |  |
Non-Guarantor Subsidiaries [Member] | Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 78,198 | 48,373 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 22,680 | 22,810 |  |
Consolidation, Eliminations [Member] |  |  |  |
Assets |  |  |  |
Current assets of discontinued operations | 0 | 0 |  |
Property and equipment, net | 0 | 0 |  |
Goodwill and other intangible assets, net | 0 | 0 |  |
Net investments in and advances to (from) consolidated affilliates | (1,030,365) | (1,005,748) |  |
Other assets | 0 | 0 |  |
Long-term assets of discontinued operations | 0 | 0 |  |
Total assets | (1,030,365) | (1,005,748) |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities of discontinued operations | 0 | 0 |  |
Long-term debt | 0 | 0 |  |
Other liabilities | 0 | 0 |  |
Total liabilities | 0 | 0 |  |
Total shareholders' equity | (1,030,365) | (1,005,748) |  |
Total liabilities and shareholders' equity | (1,030,365) | (1,005,748) |  |
Consolidation, Eliminations [Member] | Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 0 | 0 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | $ 0 | $ 0 |  |

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