Supplemental Guarantor Condensed Unaudited Consolidating Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Assets
Current assets, including discontinued operations	$ 1,489,652,000	$ 1,307,026,000
Property and equipment, net	618,672,000	488,132,000
Goodwill and other intangible assets, net	1,213,700,000	1,067,700,000
Investments in and advances to consolidated affiliates, net	0	0
Other long-term assets, including disontinued operations	73,821,000	60,390,000
Total assets	3,395,870,000	2,923,198,000
Liabilities and Equity
Total current liabilities	868,474,000	829,225,000
Long-term debt	1,088,666,000	765,425,000
Advances from consolidated affiliates, net	0	0
Other liabilities	347,400,000	307,500,000
Total liabilities	2,304,556,000	1,902,140,000
Total equity	1,091,314,000	1,021,058,000
Total liabilities and equity	3,395,870,000	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	(1,225,700,000)	(1,178,000,000)
Other long-term assets, including disontinued operations	0	0
Total assets	(1,225,700,000)	(1,178,000,000)
Liabilities and Equity
Total current liabilities	0	0
Long-term debt	0	0
Advances from consolidated affiliates, net	(65,500,000)	(22,900,000)
Other liabilities	0	0
Total liabilities	(65,500,000)	(22,900,000)
Total equity	(1,160,200,000)	(1,155,100,000)
Total liabilities and equity	(1,225,700,000)	(1,178,000,000)
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	1,077,300,000	1,006,800,000
Other long-term assets, including disontinued operations	9,300,000	9,300,000
Total assets	1,086,600,000	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	1,086,600,000	1,016,100,000
Total liabilities and equity	1,086,600,000	1,016,100,000
Guarantor Subsidiaries [Member]
Assets
Current assets, including discontinued operations	1,206,600,000	1,156,700,000
Property and equipment, net	472,100,000	420,200,000
Goodwill and other intangible assets, net	969,800,000	932,800,000
Investments in and advances to consolidated affiliates, net	0	171,200,000
Other long-term assets, including disontinued operations	38,600,000	36,200,000
Total assets	2,687,100,000	2,717,100,000
Liabilities and Equity
Total current liabilities	732,800,000	773,300,000
Long-term debt	1,005,900,000	760,900,000
Advances from consolidated affiliates, net	65,500,000	0
Other liabilities	191,000,000	236,400,000
Total liabilities	1,995,200,000	1,770,600,000
Total equity	691,900,000	946,500,000
Total liabilities and equity	2,687,100,000	2,717,100,000
Non-Guarantor Subsidiaries [Member]
Assets
Current assets, including discontinued operations	283,100,000	150,300,000
Property and equipment, net	146,600,000	67,900,000
Goodwill and other intangible assets, net	243,900,000	134,900,000
Investments in and advances to consolidated affiliates, net	148,400,000	0
Other long-term assets, including disontinued operations	25,900,000	14,900,000
Total assets	847,900,000	368,000,000
Liabilities and Equity
Total current liabilities	135,700,000	55,900,000
Long-term debt	82,800,000	4,500,000
Advances from consolidated affiliates, net	0	22,900,000
Other liabilities	156,400,000	71,100,000
Total liabilities	374,900,000	154,400,000
Total equity	473,000,000	213,600,000
Total liabilities and equity	$ 847,900,000	$ 368,000,000