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Commitments And Contingencies (Narrative) (Detail) In Millions, unless otherwise specified | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  |  | 95839 Months Ended | 95842 Months Ended | 3 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2013 | Mar. 31, 2013 Workers Compensation Policy [Member] USD ($) | Mar. 31, 2013 General Liability Policy [Member] USD ($) | Mar. 31, 2013 Automobile Liability Policy [Member] USD ($) | Mar. 31, 2013 Umbrella Policy [Member] USD ($) | Mar. 31, 2013 Pending Litigation [Member] Sintel [Member] USD ($) | Mar. 31, 2013 Pending Litigation [Member] Sintel [Member] EUR (€) | Dec. 31, 2012 Pending Litigation [Member] Sintel [Member] USD ($) | Mar. 31, 2013 Pending Litigation [Member] City Of Marathon [Member] | Mar. 31, 2013 Guarantee Obligations [Member] Letter of Credit [Member] USD ($) | Dec. 31, 2012 Guarantee Obligations [Member] Letter of Credit [Member] USD ($) | Mar. 31, 2013 Performance Guarantee [Member] USD ($) | Dec. 31, 2012 Performance Guarantee [Member] USD ($) | Dec. 31, 9999 Performance Guarantee [Member] Scenario, Forecast [Member] USD ($) | Dec. 31, 9999 Performance Guarantee [Member] Scenario, Forecast [Member] USD ($) | Mar. 31, 2013 Multiemployer Plans, Pension [Member] | Mar. 31, 2013 Minimum [Member] Pending Litigation [Member] City Of Marathon [Member] USD ($) | Mar. 31, 2013 Central States Southeast And Southwest Areas Pension Fund [Member] Multiemployer Plans, Pension [Member] USD ($) | Mar. 31, 2013 Insurance Claims [Member] USD ($) | Dec. 31, 2012 Insurance Claims [Member] USD ($) | Mar. 31, 2013 Insurance Claims [Member] Workers Compensation, General And Automobile Policies [Member] USD ($) | Dec. 31, 2012 Insurance Claims [Member] Workers Compensation, General And Automobile Policies [Member] USD ($) | Mar. 31, 2013 Insurance Claims [Member] Employee Group Health Claims Policy [Member] USD ($) | Dec. 31, 2012 Insurance Claims [Member] Employee Group Health Claims Policy [Member] USD ($) | Mar. 31, 2013 Insurance Claims [Member] Employee Group Health Claims Policy [Member] Per Employee [Member] USD ($) | Mar. 31, 2013 Insurance Claims [Member] Standby Letters of Credit [Member] USD ($) | Dec. 31, 2012 Insurance Claims [Member] Standby Letters of Credit [Member] USD ($) | Mar. 31, 2013 Insurance Claims [Member] Surety Bond [Member] USD ($) | Dec. 31, 2012 Insurance Claims [Member] Surety Bond [Member] USD ($) | Mar. 31, 2013 Withdrawal from Multiemployer Defined Benefit Plan [Member] Central States Southeast And Southwest Areas Pension Fund [Member] Multiemployer Plans, Pension [Member] USD ($)
Commitment And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal proceeding, plaintiff |  |  |  |  |  | The labor union representing the workers of Sistemas e Instalaciones de Telecomunicacion S.A. (“Sintel”) | The labor union representing the workers of Sistemas e Instalaciones de Telecomunicacion S.A. (“Sintel”) |  | the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  | $ 385 | € 300 |  |  |  |  |  |  |  |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |
Pending or threatened litigation, estimated loss |  |  |  |  |  |  |  | 9.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  |  |  |  |  |  |  |  |  | 119.3 | 120.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53.2 | 53.2 |  |  |
Outstanding bonds, amount |  |  |  |  |  |  |  |  |  |  |  | 1,100.0 | 1,100.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.0 | 9.0 |
Estimated cost to complete bonded projects |  |  |  |  |  |  |  |  |  |  |  |  |  | 162.2 | 284.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Per claim deductible, insurance policies |  | 1 | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum coverage, per claim and aggregate |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance reserve |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.8 | 48.1 | 1.1 | 1.1 |  |  |  |  |  |
Self insurance reserve, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29.7 | 28.5 |  |  |  |  |  |  |  |
Maximum loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |  |  |  | 10.8
Cash collateral held by insurance carriers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.4 | 2.0 |  |  |  |  |  |  |  |  |  |
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. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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. |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 condition. In connection with this withdrawal, the Company recorded a $6.4 million withdrawal liability based on an estimate provided by the Central States administrator of such liability as of the date of withdrawal. The Company withdrew from Central States in order to mitigate its liability in connection with the plan. Central States, however, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.4 |  |  |  |  |  |  |  |  |  |  |  |
Other guarantees, description | In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of risk retained by the entity before the insurance arrangement begins to provide coverage. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-HCO -Paragraph 37 -IssueDate 2006-05-01 -Chapter 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Description of the bargaining activity related to collective-bargaining arrangements requiring contributions to 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Description of the significant collective-bargaining arrangements within the range of expiration dates for collective-bargaining arrangements requiring contributions to a multiemployer plan as well as other information to help investors understand the significance of the collective-bargaining agreements and when they expire. 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450678-114947 + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 15 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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