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Acquisitions And Other Investments - 2012 Acquisitions (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended
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Jun. 30, 2013 Data Cell [Member] | Apr. 02, 2013 Data Cell [Member] | Jun. 30, 2013 Bottom Line Services [Member] | Jun. 30, 2013 Bottom Line Services [Member] | Dec. 02, 2012 Bottom Line Services [Member] | Dec. 02, 2012 Bottom Line Services [Member] Earn-out Arrangements [Member] | Jun. 30, 2013 Go Green [Member] | Dec. 02, 2012 Go Green [Member] | Jun. 30, 2013 Dynamic Tower [Member] | Dec. 02, 2012 Dynamic Tower [Member] | Jun. 30, 2012 Acquisitions During 2012 [Member] | Jun. 30, 2012 Acquisitions During 2012 [Member] | Jun. 30, 2013 Accrued Liabilities [Member] Bottom Line Services [Member] | Jun. 30, 2013 Accounts Receivable [Member] Bottom Line Services [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective date of acquisition | Apr. 01, 2013 |  |  | Dec. 01, 2012 |  |  | Dec. 01, 2012 |  | Dec. 01, 2012 |  |  |  |  |
Business combination, percentage of voting interests acquired |  | 100.00% |  |  | 100.00% |  |  | 100.00% |  | 100.00% |  |  |  |
Business combination, name of acquired entity | Data Cell Systems, Inc. |  |  | Bottom Line Services, LLC |  |  | Go Green Services, LLC |  | Dynamic Tower Services, Inc. |  |  |  |  |
Acquisition payments in cash |  |  |  |  | $ 67.6 |  |  |  |  |  |  |  |  |
Earn-out period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Estimated fair value of contingent consideration |  |  |  |  |  | 11.1 |  |  |  |  |  |  |  |
Business combination, description of acquired entity | Data Cell was formerly a subcontractor to MasTec's wireless business and will provide self-perform communications tower construction, installation, maintenance and other services in support of telecommunications infrastructure construction in the Company's communications segment. |  |  | BLS is engaged in providing natural gas and petroleum pipeline infrastructure services, primarily in eastern Texas. Its services include pipeline and facilities construction, painting and maintenance services. |  |  | Go Green was formerly a subcontractor to MasTec's oil and gas business and provides self-perform clearing and trenching services for natural gas and petroleum pipeline infrastructure construction in the Company's oil and gas segment. |  | DTS was formerly a subcontractor to MasTec's wireless business and provides self-perform communications tower construction, installation, maintenance and other services in support of telecommunications infrastructure construction in the Company's communications segment. |  |  |  |  |
Business combination, provisional information, initial accounting incomplete, nature of adjustments |  |  |  | $2.3 million of additional pre-acquisition project cost liabilities were recorded as a result of the ongoing review of the acquired net working capital of BLS. In addition, accounts receivable were reduced by $0.1 million. These adjustments resulted in an increase to the previously recorded amount of BLS goodwill of $2.4 million. |  |  |  |  | recorded $4.7 million of post-closing purchase price adjustments relating to the 2012 acquisition of DTS during the first quarter of 2013 based on DTS's final closing tangible net worth and net working capital |  |  |  |  |
Business combination, provisional information, initial accounting incomplete, adjustment, financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 2.3 |
Business combination, provisional information, initial accounting incomplete, adjustment, financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  | (0.1)
Goodwill, purchase price allocation adjustment |  |  | 2.4 |  |  |  |  |  |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |

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