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Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Assets |  |  |  |
Current assets | $ 1,272,242 | $ 1,048,530 |  |
Current assets of discontinued operations | 21,763 | 18,591 |  |
Property and equipment, net | 470,544 | 350,378 |  |
Goodwill and other intangible assets, net | 1,028,908 | 963,210 | 823,300 | 825,500
Net investments in and advances to (from) consolidated affilliates | 0 | 0 |  |
Other assets | 41,696 | 46,513 |  |
Long-term assets of discontinued operations | 7,516 | 7,648 |  |
Total assets | 2,820,906 | 2,416,279 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 798,608 | 714,046 |  |
Current liabilities of discontinued operations | 9,905 | 10,679 |  |
Long-term debt | 806,497 | 546,323 |  |
Other liabilities | 295,488 | 293,975 |  |
Total liabilities | 1,900,593 | 1,554,344 |  |
Total shareholders' equity | 920,313 | 861,935 |  |
Total liabilities and shareholders' equity | 2,820,906 | 2,416,279 |  |
Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 1,250,479 | 1,029,939 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 788,703 | 703,367 |  |
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 | 920,150 | 854,992 |  |
Other assets | 8,038 | 7,701 |  |
Long-term assets of discontinued operations | 0 | 0 |  |
Total assets | 928,188 | 862,693 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities of discontinued operations | 0 | 0 |  |
Long-term debt | 0 | 0 |  |
Other liabilities | 0 | 0 |  |
Total liabilities | 5 | 20 |  |
Total shareholders' equity | 928,183 | 862,673 |  |
Total liabilities and shareholders' equity | 928,188 | 862,693 |  |
MasTec, Inc. [Member] | Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 0 | 0 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 5 | 20 |  |
Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Current assets of discontinued operations | 13,409 | 13,836 |  |
Property and equipment, net | 418,501 | 338,997 |  |
Goodwill and other intangible assets, net | 925,104 | 932,481 |  |
Net investments in and advances to (from) consolidated affilliates | 199,447 | 172,348 |  |
Other assets | 33,545 | 38,732 |  |
Long-term assets of discontinued operations | 4,517 | 4,711 |  |
Total assets | 2,692,035 | 2,482,671 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities of discontinued operations | 5,775 | 6,498 |  |
Long-term debt | 780,103 | 546,262 |  |
Other liabilities | 248,272 | 273,199 |  |
Total liabilities | 1,784,171 | 1,506,495 |  |
Total shareholders' equity | 907,864 | 976,176 |  |
Total liabilities and shareholders' equity | 2,692,035 | 2,482,671 |  |
Guarantor Subsidiaries [Member] | Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 1,097,512 | 981,566 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 750,021 | 680,536 |  |
Non-Guarantor Subsidiaries [Member] |  |  |  |
Assets |  |  |  |
Current assets of discontinued operations | 8,354 | 4,755 |  |
Property and equipment, net | 52,043 | 11,381 |  |
Goodwill and other intangible assets, net | 103,804 | 30,729 |  |
Net investments in and advances to (from) consolidated affilliates | (53,383) | (21,592) |  |
Other assets | 113 | 80 |  |
Long-term assets of discontinued operations | 2,999 | 2,937 |  |
Total assets | 266,897 | 76,663 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities of discontinued operations | 4,130 | 4,181 |  |
Long-term debt | 26,394 | 61 |  |
Other liabilities | 47,216 | 20,776 |  |
Total liabilities | 116,417 | 47,829 |  |
Total shareholders' equity | 150,480 | 28,834 |  |
Total liabilities and shareholders' equity | 266,897 | 76,663 |  |
Non-Guarantor Subsidiaries [Member] | Segment, Continuing Operations [Member] |  |  |  |
Assets |  |  |  |
Current assets | 152,967 | 48,373 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 38,677 | 22,811 |  |
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 | (1,066,214) | (1,005,748) |  |
Other assets | 0 | 0 |  |
Long-term assets of discontinued operations | 0 | 0 |  |
Total assets | (1,066,214) | (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 | (1,066,214) | (1,005,748) |  |
Total liabilities and shareholders' equity | (1,066,214) | (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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