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Segments and Related Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Schedule of Financial Information by Reportable Segment
Summarized financial information for MasTec’s reportable segments is presented and reconciled to consolidated financial information for total MasTec, including a reconciliation of consolidated income (loss) before income taxes to EBITDA, in the following tables (in millions). The tables below may contain slight summation differences due to rounding.
 
For the Years Ended December 31,
Revenue:
2017
 
2016
 
2015
Communications (a)
$
2,424.4

 
$
2,323.6

 
$
1,973.2

Oil and Gas
3,497.2

 
2,024.4

 
1,495.1

Electrical Transmission
378.2

 
383.8

 
341.5

Power Generation and Industrial
299.9

 
405.7

 
381.6

Other
20.8

 
15.9

 
24.1

Eliminations
(13.5
)
 
(18.7
)
 
(7.2
)
Consolidated revenue
$
6,607.0

 
$
5,134.7

 
$
4,208.3

(a)
Revenue generated primarily by utilities customers represented 13.4%, 11.1% and 10.6% of Communications segment revenue for the years ended December 31, 2017, 2016 and 2015, respectively.
 
For the Years Ended December 31,
EBITDA:
2017
 
2016
 
2015
Communications
$
247.4

 
$
244.6

 
$
194.8

Oil and Gas
402.2

 
297.3

 
157.0

Electrical Transmission
17.6

 
(42.9
)
 
(71.3
)
Power Generation and Industrial
22.6

 
18.3

 
8.8

Other
19.8

 
(2.6
)
 
(18.8
)
Corporate
(88.7
)
 
(73.1
)
 
(120.5
)
Consolidated EBITDA
$
620.9

 
$
441.5

 
$
150.0


 
For the Years Ended December 31,
Depreciation and Amortization:
2017
 
2016
 
2015
Communications
$
53.2

 
$
50.3

 
$
50.6

Oil and Gas
96.7

 
78.4

 
84.5

Electrical Transmission
22.8

 
23.2

 
21.1

Power Generation and Industrial
9.1

 
6.2

 
6.6

Other
0.1

 
0.1

 
0.1

Corporate
6.1

 
6.7

 
6.8

Consolidated depreciation and amortization
$
188.0

 
$
164.9

 
$
169.7


 
As of December 31,
Assets:
2017
 
2016
 
2015
Communications
$
1,314.4

 
$
1,156.9

 
$
1,032.2

Oil and Gas
1,762.6

 
1,267.2

 
1,131.4

Electrical Transmission
471.4

 
419.1

 
409.1

Power Generation and Industrial
288.6

 
268.1

 
252.5

Other
153.2

 
27.7

 
34.3

Corporate
76.4

 
44.1

 
67.8

Consolidated segment assets
$
4,066.6

 
$
3,183.1

 
$
2,927.3


 
For the Years Ended December 31,
Capital Expenditures:
2017
 
2016
 
2015
Communications
$
40.5

 
$
28.5

 
$
25.8

Oil and Gas
57.7

 
64.0

 
38.1

Electrical Transmission
14.9

 
19.8

 
13.0

Power Generation and Industrial
5.4

 
3.4

 
3.5

Other
0.0

 
0.3

 
0.2

Corporate
4.9

 
1.1

 
3.8

Consolidated capital expenditures
$
123.4

 
$
117.1

 
$
84.4
Reconciliation of Consolidated Income (Loss) before Income Taxes to EBITDA

 
For the Years Ended December 31,
EBITDA Reconciliation:
2017
 
2016
 
2015
Income (loss) before income taxes
$
371.8

 
$
225.8

 
$
(67.7
)
Plus:
 
 
 
 
 
Interest expense, net
61.0

 
50.7

 
48.1

Depreciation and amortization
188.0

 
164.9

 
169.7

Consolidated EBITDA
$
620.9

 
$
441.5

 
$
150.0
Schedule of Significant Customers, Revenue Concentration Information
Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows:
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
Customer:
 
 
 
 
 
Energy Transfer affiliates (a)
40%
 
27%
 
7%
AT&T (including DIRECTV®) (b)
25%
 
34%
 
32%

(a)
The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., and its subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.
(b)
The Company’s relationship with AT&T is based upon multiple separate master service and other service agreements, including for installation and maintenance services, as well as construction/installation contracts for AT&T’s: (i) wireless business; (ii) wireline/fiber businesses; and (iii) various install-to-the-home businesses, including DIRECTV®. Revenue from AT&T is included in the Communications segment.