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Commitments and Contingencies - Other (Narrative) (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  | 0 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 Uninsured Risk [Member] Other Noncurrent Assets [Member] | Dec. 31, 2012 Uninsured Risk [Member] Other Noncurrent Assets [Member] | Dec. 31, 2013 Uninsured Risk [Member] Workers Compensation, General And Automobile Policies [Member] | Dec. 31, 2012 Uninsured Risk [Member] Workers Compensation, General And Automobile Policies [Member] | Dec. 31, 2013 Uninsured Risk [Member] Employee Group Health Claims Policy [Member] | Dec. 31, 2012 Uninsured Risk [Member] Employee Group Health Claims Policy [Member] | Dec. 31, 2013 Standby Letters of Credit [Member] Uninsured Risk [Member] | Dec. 31, 2012 Standby Letters of Credit [Member] Uninsured Risk [Member] | Dec. 31, 2013 Guarantee Obligations [Member] Letter of Credit [Member] | Dec. 31, 2012 Guarantee Obligations [Member] Letter of Credit [Member] | Dec. 31, 2013 Performance Guarantee [Member] | Dec. 31, 2012 Performance Guarantee [Member] | Dec. 31, 2013 Performance Guarantee [Member] Estimate [Member] | Dec. 31, 2012 Performance Guarantee [Member] Estimate [Member] | Dec. 31, 2013 Surety Bond [Member] Uninsured Risk [Member] | Dec. 31, 2012 Surety Bond [Member] Uninsured Risk [Member] | Dec. 31, 2013 Subsidiary Issuer [Member]
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit, outstanding amount |  |  |  |  |  |  | $ 57.4 | $ 53.2 | $ 134.8 | $ 120.8 |  |  |  |  |  |  |
Outstanding bonds, amount |  |  |  |  |  |  |  |  |  |  | 1,000.0 | 1,100.0 |  |  | 10.9 | 9.0 |
Estimated cost to complete bonded projects |  |  |  |  |  |  |  |  |  |  |  |  | 297.1 | 287.7 |  |  |
Self insurance reserve |  |  | 50.8 | 48.1 | 2.1 | 1.1 |  |  |  |  |  |  |  |  |  |  |
Self insurance reserve, noncurrent |  |  | 31.3 | 28.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash collateral held by insurance carriers | $ 1.4 | $ 1.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 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=26872669&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 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 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + 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 + 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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- Definition Carrying amount 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 that are expected to be paid after one year (or the normal operating cycle, if longer). + References No definition available. + Details
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