Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Total current assets	$ 1,321,842	$ 1,129,758
Property and equipment, net	559,057	558,667
Goodwill and other intangible assets, net	1,190,600	1,187,900
Investments in and advances to consolidated affiliates, net	0	0
Other long-term assets	52,372	51,032
Total assets	3,123,943	2,927,347
Liabilities and equity
Total current liabilities	866,434	752,535
Long-term debt	998,440	932,868
Other long-term liabilities	288,900	298,500
Total liabilities	2,153,727	1,983,956
Total equity	970,216	943,391
Total liabilities and equity	3,123,943	2,927,347
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Assets
Total current assets	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Investments in and advances to consolidated affiliates, net	956,400	930,300
Other long-term assets	9,300	9,300
Total assets	965,700	939,600
Liabilities and equity
Total current liabilities	0	0
Long-term debt	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Total equity	965,700	939,600
Total liabilities and equity	965,700	939,600
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Assets
Total current assets	1,176,400	927,400
Property and equipment, net	453,000	448,200
Goodwill and other intangible assets, net	1,045,300	1,047,400
Investments in and advances to consolidated affiliates, net	44,000	103,700
Other long-term assets	19,500	24,400
Total assets	2,738,200	2,551,100
Liabilities and equity
Total current liabilities	751,800	632,900
Long-term debt	976,500	900,100
Other long-term liabilities	232,300	275,500
Total liabilities	1,960,600	1,808,500
Total equity	777,600	742,500
Total liabilities and equity	2,738,200	2,551,000
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Assets
Total current assets	145,400	202,400
Property and equipment, net	106,100	110,500
Goodwill and other intangible assets, net	145,300	140,500
Investments in and advances to consolidated affiliates, net	111,300	50,600
Other long-term assets	23,600	17,300
Total assets	531,700	521,300
Liabilities and equity
Total current liabilities	114,600	119,600
Long-term debt	21,900	32,800
Other long-term liabilities	56,600	23,000
Total liabilities	193,100	175,400
Total equity	338,600	345,900
Total liabilities and equity	531,700	521,300
Eliminations [Member]
Assets
Total current assets	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Investments in and advances to consolidated affiliates, net	(1,111,700)	(1,084,600)
Other long-term assets	0	0
Total assets	(1,111,700)	(1,084,600)
Liabilities and equity
Total current liabilities	0	0
Long-term debt	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Total equity	(1,111,700)	(1,084,600)
Total liabilities and equity	$ (1,111,700)	$ (1,084,600)