The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

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Description of the nature and effect of an increase (decrease) in the percentage of the entity's employees covered by the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

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Description of the general nature of multiemployer plans and of the employer's participation in those plans that would indicate how the risks of participating in these plans are different from single-employer plans. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

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-Publisher FASB

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Description of the extent to which the employer could be responsible for obligations of the multiemployer plan, including benefits earned by employees during employment with another employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

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Other Retirement Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Multi-Employer Plans, Pension [Member]	Dec. 31, 2011 Multi-Employer Plans, Pension [Member] Central States Southeast And Southwest Areas Pension Fund [Member] Withdrawal from Multiemployer Defined Benefit Plan [Member]	Dec. 31, 2013 Multi-Employer Plans, Pension [Member] Central States Southeast And Southwest Areas Pension Fund [Member] Withdrawal from Multiemployer Defined Benefit Plan [Member]	Nov. 15, 2011 Multi-Employer Plans, Pension [Member] Central States Southeast And Southwest Areas Pension Fund [Member] Withdrawal from Multiemployer Defined Benefit Plan [Member]
Multi-Employer Plans [Line Items]
Multiemployer plans, general nature	Multi-Employer Plans. Certain of MasTec’s subsidiaries contribute amounts to multi-employer pension and other multi-employer benefit plans and trusts, which are recorded as a component of employee wages and salaries within costs of revenue, excluding depreciation and amortization. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. Multi-employer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.
Multi-employer plans, underfunded status, description		A multi-employer plan that is so underfunded as to be in “endangered” or “critical” status is required to adopt a funding improvement plan (“FIP”) or a rehabilitation plan (“RP”), which, among other actions, could include decreased benefits and increased contributions. These actions are intended to improve their funding status over a period of years. If a pension fund is in critical status, a participating employer must pay an automatic surcharge in addition to contributions otherwise required under the collective bargaining agreement (“CBA”). With some exceptions, the surcharge is equal to 5% of required contributions for the initial critical year, and 10% for each succeeding plan year in which the plan remains in critical status. The surcharge ceases on the effective date of a CBA (or other agreement) that includes contribution and benefit terms consistent with the rehabilitation plan.
Multi-employer plans, employees increase (decrease), description	The number of union employees employed at any given time, and the plans in which they may participate, varies depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.
Multi-employer plan, withdrawal charge			$ 6.4
Multi-employer plans, withdrawal liability				$ 5.4	$ 6.4