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Commitments and Contingencies - Other (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  | 18 Months Ended | 24 Months Ended |  |
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Jun. 30, 2013 | Jun. 30, 2013 Workers Compensation Policy [Member] | Jun. 30, 2013 General Liability Policy [Member] | Jun. 30, 2013 Automobile Liability Policy [Member] | Jun. 30, 2013 Umbrella Policy [Member] | Jun. 30, 2013 Insurance Claims [Member] | Dec. 31, 2012 Insurance Claims [Member] | Jun. 30, 2013 Insurance Claims [Member] Workers Compensation, General And Automobile Policies [Member] | Dec. 31, 2012 Insurance Claims [Member] Workers Compensation, General And Automobile Policies [Member] | Jun. 30, 2013 Insurance Claims [Member] Employee Group Health Claims Policy [Member] | Dec. 31, 2012 Insurance Claims [Member] Employee Group Health Claims Policy [Member] | Jun. 30, 2013 Insurance Claims [Member] Employee Group Health Claims Policy [Member] Per Employee [Member] | Jun. 30, 2013 Standby Letters of Credit [Member] Insurance Claims [Member] | Dec. 31, 2012 Standby Letters of Credit [Member] Insurance Claims [Member] | Jun. 30, 2013 Guarantee Obligations [Member] Letter of Credit [Member] | Dec. 31, 2012 Guarantee Obligations [Member] Letter of Credit [Member] | Jun. 30, 2013 Performance Guarantee [Member] | Dec. 31, 2012 Performance Guarantee [Member] | Dec. 31, 2014 Performance Guarantee [Member] Scenario, Forecast [Member] | Dec. 31, 2014 Performance Guarantee [Member] Scenario, Forecast [Member] | Jun. 30, 2013 Surety Bond [Member] Insurance Claims [Member] | Dec. 31, 2012 Surety Bond [Member] Insurance Claims [Member]
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 53.2 | $ 53.2 | $ 119.6 | $ 120.8 |  |  |  |  |  |
Outstanding bonds, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400.0 | 1,100.0 |  |  | 10.9 | 9.0
Estimated cost to complete bonded projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 655.9 | 284.5 |  |
Per claim deductible, insurance policies |  | 1 | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum coverage, per claim and aggregate |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance reserve |  |  |  |  |  |  |  | 50.2 | 48.1 | 1.2 | 1.1 |  |  |  |  |  |  |  |  |  |  |
Self insurance reserve, noncurrent |  |  |  |  |  |  |  | 29.7 | 28.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum loss |  |  |  |  |  |  |  |  |  |  |  | 0.4 |  |  |  |  |  |  |  |  |  |
Cash collateral held by insurance carriers |  |  |  |  |  | $ 1.4 | $ 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 Costs incurred and are directly related to generating contract revenues. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(e)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph b -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Describes how and under what circumstances or in connection with which transaction the guarantee or each group of similar guarantees was given and the objective of the guarantee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -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 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 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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