Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets
Current assets, including discontinued operations	$ 1,332,316	$ 1,049,641
Property and equipment, net	504,313	350,192
Goodwill and other intangible assets, net	1,064,099	961,973
Net investments in and advances to (from) consolidated affilliates	0	0
Other long-term assets, including disontinued operations	53,610	54,160
Total assets	2,954,338	2,415,966
Liabilities and Shareholders' Equity
Total current liabilities	882,229	713,793
Long-term debt	779,920	546,323
Other liabilities	313,102	293,975
Total liabilities	1,975,251	1,554,091
Total shareholders' equity	979,087	861,875
Total liabilities and shareholders' equity	2,954,338	2,415,966
Consolidation, Eliminations [Member]
Assets
Current assets, including 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	(1,122,552)	(1,005,748)
Other long-term assets, including disontinued operations	0	0
Total assets	(1,122,552)	(1,005,748)
Liabilities and Shareholders' Equity
Total current liabilities	0	0
Long-term debt	0	0
Other liabilities	0	0
Total liabilities	0	0
Total shareholders' equity	(1,122,552)	(1,005,748)
Total liabilities and shareholders' equity	(1,122,552)	(1,005,748)
MasTec, Inc. [Member]
Assets
Current assets, including 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	974,904	854,992
Other long-term assets, including disontinued operations	9,216	7,701
Total assets	984,120	862,693
Liabilities and Shareholders' Equity
Total current liabilities	8	20
Long-term debt	0	0
Other liabilities	0	0
Total liabilities	8	20
Total shareholders' equity	984,112	862,673
Total liabilities and shareholders' equity	984,120	862,693
Guarantor Subsidiaries [Member]
Assets
Current assets, including discontinued operations	1,120,527	960,523
Property and equipment, net	431,899	326,588
Goodwill and other intangible assets, net	890,683	890,323
Net investments in and advances to (from) consolidated affilliates	147,960	172,150
Other long-term assets, including disontinued operations	42,899	43,442
Total assets	2,633,968	2,393,026
Liabilities and Shareholders' Equity
Total current liabilities	799,374	675,966
Long-term debt	750,841	546,262
Other liabilities	226,184	262,099
Total liabilities	1,776,399	1,484,327
Total shareholders' equity	857,569	908,699
Total liabilities and shareholders' equity	2,633,968	2,393,026
Non-Guarantor Subsidiaries [Member]
Assets
Current assets, including discontinued operations	211,789	89,118
Property and equipment, net	72,414	23,604
Goodwill and other intangible assets, net	173,416	71,650
Net investments in and advances to (from) consolidated affilliates	(312)	(21,394)
Other long-term assets, including disontinued operations	1,495	3,017
Total assets	458,802	165,995
Liabilities and Shareholders' Equity
Total current liabilities	82,847	37,807
Long-term debt	29,079	61
Other liabilities	86,918	31,876
Total liabilities	198,844	69,744
Total shareholders' equity	259,958	96,251
Total liabilities and shareholders' equity	$ 458,802	$ 165,995