Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Assets
Current assets, including discontinued operations	$ 1,573,952,000	$ 1,307,026,000
Property and equipment, net	614,359,000	488,132,000
Goodwill and other intangible assets, net	1,222,100,000	1,067,700,000
Investments in and advances to consolidated affiliates, net	0	0
Other long-term assets, including disontinued operations	59,579,000	60,390,000
Total assets	3,470,126,000	2,923,198,000
Liabilities and Equity
Total current liabilities	910,874,000	829,225,000
Long-term debt	1,088,289,000	765,425,000
Advances from consolidated affiliates, net	0	0
Other liabilities	342,000,000	307,500,000
Total liabilities	2,341,239,000	1,902,140,000
Total equity	1,128,887,000	1,021,058,000
Total liabilities and equity	3,470,126,000	2,923,198,000
Eliminations [Member]
Assets
Current assets, including discontinued operations	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Investments in and advances to consolidated affiliates, net	(1,222,100,000)	(1,177,600,000)
Other long-term assets, including disontinued operations	0	0
Total assets	(1,222,100,000)	(1,177,600,000)
Liabilities and Equity
Total current liabilities	0	0
Long-term debt	0	0
Advances from consolidated affiliates, net	(23,800,000)	(22,500,000)
Other liabilities	0	0
Total liabilities	(23,800,000)	(22,500,000)
Total equity	(1,198,300,000)	(1,155,100,000)
Total liabilities and equity	(1,222,100,000)	(1,177,600,000)
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
Investments in and advances to consolidated affiliates, net	1,114,800,000	1,006,800,000
Other long-term assets, including disontinued operations	9,300,000	9,300,000
Total assets	1,124,100,000	1,016,100,000
Liabilities and Equity
Total current liabilities	0	0
Long-term debt	0	0
Advances from consolidated affiliates, net	0	0
Other liabilities	0	0
Total liabilities	0	0
Total equity	1,124,100,000	1,016,100,000
Total liabilities and equity	1,124,100,000	1,016,100,000
Guarantor Subsidiaries [Member]
Assets
Current assets, including discontinued operations	1,251,500,000	1,156,700,000
Property and equipment, net	475,500,000	420,200,000
Goodwill and other intangible assets, net	972,600,000	932,800,000
Investments in and advances to consolidated affiliates, net	0	170,800,000
Other long-term assets, including disontinued operations	35,300,000	36,200,000
Total assets	2,734,900,000	2,716,700,000
Liabilities and Equity
Total current liabilities	736,600,000	773,300,000
Long-term debt	1,053,600,000	760,900,000
Advances from consolidated affiliates, net	23,800,000	0
Other liabilities	190,800,000	236,400,000
Total liabilities	2,004,800,000	1,770,600,000
Total equity	730,100,000	946,100,000
Total liabilities and equity	2,734,900,000	2,716,700,000
Non-Guarantor Subsidiaries [Member]
Assets
Current assets, including discontinued operations	322,500,000	150,300,000
Property and equipment, net	138,900,000	67,900,000
Goodwill and other intangible assets, net	249,500,000	134,900,000
Investments in and advances to consolidated affiliates, net	107,300,000	0
Other long-term assets, including disontinued operations	15,000,000	14,900,000
Total assets	833,200,000	368,000,000
Liabilities and Equity
Total current liabilities	174,300,000	55,900,000
Long-term debt	34,700,000	4,500,000
Advances from consolidated affiliates, net	0	22,500,000
Other liabilities	151,200,000	71,100,000
Total liabilities	360,200,000	154,000,000
Total equity	473,000,000	214,000,000
Total liabilities and equity	$ 833,200,000	$ 368,000,000