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Segments and Related Information (Schedule of Segment Reporting Information, by Segment - EBITDA) (Details) (Continuing Operations [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information [Line Items] |  |  |
EBITDA | $ 427.6 | $ 322.1 | $ 267.9
Operating Segments [Member] | Communications [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
EBITDA | 247.7 | 192.0 | 154.3
Operating Segments [Member] | Oil and Gas [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
EBITDA | 215.9 | 99.4 | 80.1
Operating Segments [Member] | Electrical Transmission [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
EBITDA | 41.2 | 38.7 | 28.7
Operating Segments [Member] | Power Generation and Industrial [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
EBITDA | (16.3) | 32.0 | (3.2)
Operating Segments [Member] | Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
EBITDA | 0.5 | 2.0 | 0.4
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
EBITDA | $ (61.4) | $ (42.0) | $ 7.6

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- Definition Income from continuing operations before interest, taxes, depreciation and amortization + References No definition available. + Details
Name: | mtz_Ebitda
Namespace Prefix: | mtz_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration