Commitments and Contingencies - Collective Bargaining Agreements and Multi-Employer Pension Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Nov. 15, 2011
Commitments and Contingencies [Line Items]
Multiemployer plans, collective bargaining arrangement, description	Certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. The agreements require the subsidiaries party to the agreements to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to multi-employer pension plans and employee benefit trusts. The multi-employer pension plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls.
Multiemployer plans, collective bargaining arrangement, expiration date, description	The collective bargaining agreements expire at various times and have typically been renegotiated and renewed on terms similar to the ones contained in the expiring agreements.
Multiemployer Plans, Pension [Member]
Commitments and Contingencies [Line Items]
Underfunded multi-employer pension plans, funding requirements and penalties, description	The Pension Protection Act requires that underfunded pension plans improve their funding ratios within prescribed intervals based on the level of their underfunding. In addition, if a multi-employer defined benefit plan fails to satisfy certain minimum funding requirements, the Internal Revenue Service may impose on the employers contributing to such plan a nondeductible excise tax of 5% on the amount of the accumulated funding deficiency.
Multiemployer Plans, Pension [Member] | Central States Southeast And Southwest Areas Pension Fund [Member]
Commitments and Contingencies [Line Items]
Multiemployer plans, withdrawal liability	$ 6.0
Multiemployer Plans, Pension [Member] | Withdrawal from Multiemployer Defined Benefit Plan [Member] | Central States Southeast And Southwest Areas Pension Fund [Member]
Commitments and Contingencies [Line Items]
Multi-employer pension plan withdrawal obligation, description	On November 15, 2011, the Company, along with other members of the Pipe Line Contractors Association (“PLCA”), voluntarily withdrew from the Central States Southeast and Southwest Areas Pension Fund (“Central States”), a defined benefit multi-employer pension plan that is in critical status. In connection with this withdrawal, a $6.4 million withdrawal liability was established based on an estimate provided by the Central States administrator of such liability as of the date of withdrawal. The Company began paying installments towards this withdrawal liability in 2013, of which $6.0 million was outstanding as of June 30, 2013. The Company withdrew from Central States in order to mitigate its liability in connection with the plan; however, Central States has asserted that the PLCA members did not effectively withdraw in 2011 and are, therefore, responsible for a withdrawal liability that includes 2011 contribution amounts. By letter dated March 14, 2013, Central States made a demand on the Company for the sum of $10.8 million in withdrawal liability, which sum included 2011 contribution amounts. The Company is vigorously opposing this demand because it believes that it legally and effectively withdrew from Central States on November 15, 2011. If Central States were to prevail in its assertion that the Company, in fact, withdrew after that date, then the amount of the Company’s withdrawal liability would increase to approximately $10.8 million. In addition, if Central States were to undergo a mass withdrawal, as defined by ERISA and the Pension Benefit Guaranty Corporation, within the three year period commencing with the beginning of the calendar year during which the Company withdrew from the plan, there could be additional liability.
Multiemployer plans, withdrawal liability	6.0	6.4
Maximum loss	$ 10.8