$MTZ
MasTec Inc Stock $mtz

$mtz Overview Financials Valuation SEC Filings Company Website

2016 Q4 Form 10-K Financial Statement

#000001561518000007 Filed on February 27, 2018

Income Statement

Concept	2016 Q4	2016 Q3	2016 Q2
Revenue	$1.342B	$1.586B	$1.232B
YoY Change	30.61%	42.77%	15.54%
Cost Of Revenue	$1.121B	$1.369B	$1.068B
YoY Change	22.31%	40.74%	12.93%
Gross Profit	$221.3M	$217.2M	$164.2M
YoY Change	99.01%	57.05%	36.04%
Gross Profit Margin	16.49%	13.69%	13.32%
Selling, General & Admin	$66.40M	$67.10M	$67.90M
YoY Change	12.93%	5.17%	-2.02%
% of Gross Profit	30.0%	30.89%	41.35%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$42.70M	$42.58M	$40.66M
YoY Change	2.4%	0.92%	-6.0%
% of Gross Profit	19.3%	19.61%	24.76%
Operating Expenses	$115.0M	$108.7M	$110.0M
YoY Change	29.65%	-5.23%	-1.08%
Operating Profit	$106.3M	$108.5M	$54.20M
YoY Change	372.44%	359.75%	470.53%
Interest Expense	-$12.90M	-$13.10M	-$12.20M
YoY Change	5.74%	9.17%	-5.43%
% of Operating Profit	-12.14%	-12.07%	-22.51%
Other Income/Expense, Net		$971.0K	-$1.524M
YoY Change		-115.34%	-130.53%
Pretax Income	$93.40M	$95.35M	$42.04M
YoY Change	-236.75%	599.07%	-1869.32%
Income Tax	$37.50M	$38.82M	$17.60M
% Of Pretax Income	40.15%	40.71%	41.87%
Net Earnings	$53.60M	$56.30M	$24.10M
YoY Change	-169.88%	640.79%	-751.35%
Net Earnings / Revenue	3.99%	3.55%	1.96%
Basic Earnings Per Share	$0.67	$0.70	$0.30
Diluted Earnings Per Share	$0.66	$0.69	$0.30
COMMON SHARES
Basic Shares Outstanding	82.39M shares	80.46M shares	80.35M shares
Diluted Shares Outstanding		81.55M shares	81.27M shares

Balance Sheet

Concept	2016 Q4	2016 Q3	2016 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$38.80M	$9.400M	$8.800M
YoY Change	676.0%	30.56%	83.33%
Cash & Equivalents	$38.80M	$9.427M	$8.758M
Short-Term Investments
Other Short-Term Assets	$55.11M	$56.34M	$61.19M
YoY Change	-19.18%	-51.85%	-48.71%
Inventory	$111.0M	$108.4M	$115.8M
Prepaid Expenses	$41.55M	$32.27M	$45.07M
Receivables	$1.156B	$1.216B	$1.091B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$1.402B	$1.422B	$1.322B
YoY Change	24.14%	14.87%	-2.39%
LONG-TERM ASSETS
Property, Plant & Equipment	$549.1M	$554.5M	$559.1M
YoY Change	-1.72%	-5.53%	-9.07%
Goodwill	$995.9M	$997.2M	$998.1M
YoY Change	0.75%	-6.35%	-6.99%
Intangibles	$179.7M	$186.5M	$192.6M
YoY Change	-9.88%	-14.74%	-16.3%
Long-Term Investments
YoY Change
Other Assets	$55.98M	$53.39M	$52.37M
YoY Change	9.69%	-61.0%	-38.11%
Total Long-Term Assets	$1.781B	$1.792B	$1.802B
YoY Change	-0.94%	-10.75%	-10.01%
TOTAL ASSETS
Total Short-Term Assets	$1.402B	$1.422B	$1.322B
Total Long-Term Assets	$1.781B	$1.792B	$1.802B
Total Assets	$3.183B	$3.214B	$3.124B
YoY Change	8.74%	-0.98%	-6.94%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$363.7M	$435.7M	$441.0M
YoY Change	4.34%	15.61%	1.5%
Accrued Expenses	$112.3M	$118.4M	$85.04M
YoY Change	61.87%	45.46%	-5.16%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$64.60M	$66.10M	$70.40M
YoY Change	-16.54%	-16.12%	-10.2%
Total Short-Term Liabilities	$840.0M	$942.4M	$866.4M
YoY Change	11.62%	19.68%	1.58%
LONG-TERM LIABILITIES
Long-Term Debt	$961.4M	$950.6M	$998.4M
YoY Change	3.05%	-13.47%	-12.17%
Other Long-Term Liabilities	$99.77M	$98.42M	$90.48M
YoY Change	-9.13%	51.24%	43.39%
Total Long-Term Liabilities	$99.77M	$98.42M	$90.48M
YoY Change	-9.13%	51.24%	43.39%
TOTAL LIABILITIES
Total Short-Term Liabilities	$840.0M	$942.4M	$866.4M
Total Long-Term Liabilities	$99.77M	$98.42M	$90.48M
Total Liabilities	$2.079B	$2.184B	$2.154B
YoY Change	4.82%	-1.66%	-7.56%
SHAREHOLDERS EQUITY
Retained Earnings	$509.9M	$456.4M	$400.1M
YoY Change	34.66%	0.2%	-10.66%
Common Stock	$798.0M	$794.9M	$790.3M
YoY Change	2.46%	2.35%	2.18%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.097B	$1.025B	$965.7M
YoY Change
Total Liabilities & Shareholders Equity	$3.183B	$3.214B	$3.124B
YoY Change	8.74%	-0.98%	-6.94%

Cashflow Statement

Concept	2016 Q4	2016 Q3	2016 Q2
OPERATING ACTIVITIES
Net Income	$53.60M	$56.30M	$24.10M
YoY Change	-169.88%	640.79%	-751.35%
Depreciation, Depletion And Amortization	$42.70M	$42.58M	$40.66M
YoY Change	2.4%	0.92%	-6.0%
Cash From Operating Activities	$78.50M	$98.60M	$12.60M
YoY Change	-26.5%	4.12%	-73.25%
INVESTING ACTIVITIES
Capital Expenditures	-$28.00M	-$25.20M	-$50.60M
YoY Change	105.88%	12.5%	76.31%
Acquisitions
YoY Change
Other Investing Activities	-$18.90M	-$9.000M	$3.300M
YoY Change	-134.12%	-73.45%	-109.4%
Cash From Investing Activities	-$46.90M	-$34.20M	-$47.30M
YoY Change	-212.2%	-39.25%	-25.86%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-1.900M	-63.60M	39.60M
YoY Change	-98.75%	72.83%	-621.05%
NET CHANGE
Cash From Operating Activities	78.50M	98.60M	12.60M
Cash From Investing Activities	-46.90M	-34.20M	-47.30M
Cash From Financing Activities	-1.900M	-63.60M	39.60M
Net Change In Cash	29.70M	800.0K	4.900M
YoY Change	-1058.06%	-50.0%	-120.16%
FREE CASH FLOW
Cash From Operating Activities	$78.50M	$98.60M	$12.60M
Capital Expenditures	-$28.00M	-$25.20M	-$50.60M
Free Cash Flow	$106.5M	$123.8M	$63.20M
YoY Change	-11.54%	5.72%	-16.62%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2016Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	67126000	USD
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	89087000	USD
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Period End Date DocumentPeriodEndDate	2017-12-31
CY2017	dei	Document Type DocumentType	10-K
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000015615
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	82824893	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	3000000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	MASTEC INC
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017	dei	Trading Symbol TradingSymbol	MTZ
CY2017	mtz	Backlog Expected Timing Of Recognition Period BacklogExpectedTimingOfRecognitionPeriod	P18M
CY2016Q4	mtz	Book Overdrafts BookOverdrafts	39900000	USD
CY2017Q4	mtz	Book Overdrafts BookOverdrafts	30000000	USD
CY2016Q4	mtz	Deferred Tax Assets Unrealized Gains And Losses DeferredTaxAssetsUnrealizedGainsAndLosses	26300000	USD
CY2017Q4	mtz	Deferred Tax Assets Unrealized Gains And Losses DeferredTaxAssetsUnrealizedGainsAndLosses	11400000	USD
CY2017	mtz	Defined Contribution Plan Employer Full Matching Contribution Percent DefinedContributionPlanEmployerFullMatchingContributionPercent	0.03
CY2017	mtz	Defined Contribution Plan Employer Matching Contribution Percent Of Match Up To Specific Percentage DefinedContributionPlanEmployerMatchingContributionPercentOfMatchUpToSpecificPercentage	1
CY2017	mtz	Defined Contribution Plan Employer Matching Contribution Percent Of Match Within Specified Percentage Range DefinedContributionPlanEmployerMatchingContributionPercentOfMatchWithinSpecifiedPercentageRange	0.5
CY2017	mtz	Defined Contribution Plan Employer Partial Matching Contribution Percent DefinedContributionPlanEmployerPartialMatchingContributionPercent	0.02
CY2015	mtz	Ebitda Ebitda	150000000	USD
CY2016	mtz	Ebitda Ebitda	441500000	USD
CY2017	mtz	Ebitda Ebitda	620900000	USD
CY2017	mtz	Employer Matching Contribution Percent Of Matching Contribution Payable In Cash EmployerMatchingContributionPercentOfMatchingContributionPayableInCash	0.5
CY2017	mtz	Employer Matching Contribution Percent Of Matching Contribution Payable In Shares EmployerMatchingContributionPercentOfMatchingContributionPayableInShares	0.5
CY2017	mtz	Intangible Assets Acquired Gross Excluding Goodwill IntangibleAssetsAcquiredGrossExcludingGoodwill	28800000	USD
CY2016	mtz	Intangible Assets Excluding Goodwill Other Activity IntangibleAssetsExcludingGoodwillOtherActivity	0	USD
CY2016	mtz	Intangible Assets Gross Excluding Goodwill Translation Adjustments IntangibleAssetsGrossExcludingGoodwillTranslationAdjustments	1600000	USD
CY2017	mtz	Intangible Assets Gross Excluding Goodwill Translation Adjustments IntangibleAssetsGrossExcludingGoodwillTranslationAdjustments	3500000	USD
CY2016Q4	mtz	Longterm Debtand Capital Lease Obligations Including Current Maturities Gross LongtermDebtandCapitalLeaseObligationsIncludingCurrentMaturitiesGross	1035800000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	8400000	USD
CY2017Q4	mtz	Longterm Debtand Capital Lease Obligations Including Current Maturities Gross LongtermDebtandCapitalLeaseObligationsIncludingCurrentMaturitiesGross	1381600000	USD
CY2015	mtz	Net Financing Activities And Advances From To Consolidated Affiliates NetFinancingActivitiesAndAdvancesFromToConsolidatedAffiliates	0	USD
CY2016	mtz	Net Financing Activities And Advances From To Consolidated Affiliates NetFinancingActivitiesAndAdvancesFromToConsolidatedAffiliates	0	USD
CY2017	mtz	Net Financing Activities And Advances From To Consolidated Affiliates NetFinancingActivitiesAndAdvancesFromToConsolidatedAffiliates	0	USD
CY2016	mtz	Noncontrolling Interests Other NoncontrollingInterestsOther	510000	USD
CY2017	mtz	Number Of Customers1 NumberOfCustomers1	500	customer
CY2015	mtz	Shares Paid For Exercise Price And Tax Withholding For Share Based Compensation SharesPaidForExercisePriceAndTaxWithholdingForShareBasedCompensation	74407	shares
CY2016	mtz	Shares Paid For Exercise Price And Tax Withholding For Share Based Compensation SharesPaidForExercisePriceAndTaxWithholdingForShareBasedCompensation	44988	shares
CY2017	mtz	Shares Paid For Exercise Price And Tax Withholding For Share Based Compensation SharesPaidForExercisePriceAndTaxWithholdingForShareBasedCompensation	138519	shares
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	363668000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	377954000	USD
CY2016Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	1164400000	USD
CY2017Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	1606200000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1156031000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1598015000	USD
CY2016Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	112291000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	148971000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	633100000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	749100000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-34004000	USD
CY2015Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-72351000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-65814000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-63712000	USD
CY2017	us-gaap	Additional Information About Entitys Reportable Segments AdditionalInformationAboutEntitysReportableSegments	Segment results include certain allocations of centralized costs such as general liability, medical and workers’ compensation insurance and certain information technology costs. Income tax expense is managed by Corporate on a consolidated basis and is not allocated to the reportable segments.
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	788914000	USD
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	775387000	USD
CY2015	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	-597000	USD
CY2016	us-gaap	Adjustment To Additional Paid In Capital Income Tax Effect From Share Based Compensation Net AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet	-107000	USD
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	3085000	USD
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	12395000	USD
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	15072000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	15656000	USD
CY2015	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	12395000	USD
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	15072000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	15656000	USD
CY2015Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	7700000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	8200000	USD
CY2016	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	2200000	USD
CY2017	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	2800000	USD
CY2015	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2633000	USD
CY2016	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2994000	USD
CY2017	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3100000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	28400000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	21300000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	20900000	USD
CY2015Q4	us-gaap	Assets Assets	2927300000	USD
CY2016Q4	us-gaap	Assets Assets	3183132000	USD
CY2017Q4	us-gaap	Assets Assets	4066576000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	1402486000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	1852366000	USD
CY2016Q4	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	161459000	USD
CY2017Q4	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	194494000	USD
CY2017	us-gaap	Business Acquisition Pro Forma Information Description BusinessAcquisitionProFormaInformationDescription	The above indicated unaudited pro forma financial results, which represent the results of operations of the companies acquired as if the acquired companies had been consolidated as of January 1, 2016, are provided for illustrative purposes only and do not purport to be indicative of the actual results that would have been achieved by the combined companies for the periods indicated, or of the results that may be achieved by the combined companies in the future. The unaudited supplemental pro forma financial results have been prepared by adjusting the historical results of MasTec to include the historical results of the acquired businesses described above, and then adjusted (i) to remove acquisition costs; (ii) to increase amortization expense resulting from the acquired intangible assets; (iii) to increase interest expense as a result of the cash consideration paid; (iv) to reduce interest expense from debt repaid upon acquisition; and (iv) to eliminate the effects of intercompany transactions. These unaudited supplemental pro forma financial results do not include adjustments to reflect other cost savings or synergies that may have resulted from these acquisitions.
CY2016	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	140000000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	354900000	USD
CY2016	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	5320100000	USD
CY2017	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	6680200000	USD
CY2017	us-gaap	Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	10200000	USD
CY2017	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	160100000	USD
CY2015	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	3164000	USD
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	1582000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	4716000	USD
CY2016Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	98600000	USD
CY2017Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	181200000	USD
CY2017Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	63500000	USD
CY2015	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	23817000	USD
CY2016	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	25092000	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	150055000	USD
CY2017Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	117700000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	196400000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	69500000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	9100000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	29000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	39400000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	49400000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	0	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	15200000	USD
CY2016Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	107800000	USD
CY2017Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	109900000	USD
CY2016Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	30900000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	24059000	USD
CY2017Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	23500000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4984000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	38767000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	40326000	USD
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-19075000	USD
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	33783000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1559000	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	145000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	145000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	90634771	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	90935584	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	9063000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	9094000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-117457000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	137800000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	349315000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-593000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2772000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	1671000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-118050000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	140572000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	350986000	USD
CY2016Q4	us-gaap	Contract Receivable Due One Year Or Less ContractReceivableDueOneYearOrLess	564200000	USD
CY2017Q4	us-gaap	Contract Receivable Due One Year Or Less ContractReceivableDueOneYearOrLess	683900000	USD
CY2016Q4	us-gaap	Contract Receivable Retainage Due One Year Or Less ContractReceivableRetainageDueOneYearOrLess	268600000	USD
CY2017Q4	us-gaap	Contract Receivable Retainage Due One Year Or Less ContractReceivableRetainageDueOneYearOrLess	323100000	USD
CY2015	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	3721303000	USD
CY2016Q1	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	884400000	USD
CY2016Q2	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	1068200000	USD
CY2016Q3	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	1369000000	USD
CY2016Q4	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	1120600000	USD
CY2016	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	4442125000	USD
CY2017Q1	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	971100000	USD
CY2017Q2	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	1626300000	USD
CY2017Q3	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	1726200000	USD
CY2017Q4	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	1421700000	USD
CY2017	us-gaap	Cost Of Services Excluding Depreciation Depletion And Amortization CostOfServicesExcludingDepreciationDepletionAndAmortization	5745307000	USD
CY2016Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	331600000	USD
CY2017Q4	us-gaap	Costs In Excess Of Billings On Uncompleted Contracts Or Programs Expected To Be Collected Within One Year CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	599200000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-4500000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	85800000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-6000000	USD
CY2015	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	9400000	USD
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	3000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7600000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	11500000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	8200000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	95500000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4700000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	3300000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6700000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-800000	USD
CY2017	us-gaap	Deferred Compensation Arrangements Overall Description DeferredCompensationArrangementsOverallDescription	MasTec offers a deferred compensation plan to its highly compensated employees. These employees are allowed to contribute a percentage of their pre-tax annual compensation to the deferred compensation plan. The Company also offers a deferred compensation plan to its Board of Directors, under which directors may elect to defer the receipt of compensation for their services.
CY2016Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	7600000	USD
CY2017Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	9700000	USD
CY2016Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	7700000	USD
CY2017Q4	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	9400000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	25700000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6100000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	18200000	USD
CY2016Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	9800000	USD
CY2017Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	13000000	USD
CY2015	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-19900000	USD
CY2016	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-6800000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-7500000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	3925000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3935000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	18277000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	278700000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	271500000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	166600000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	204518000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2000000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-3000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	11800000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	112100000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	67000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	34900000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	54900000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	12400000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	7900000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	24100000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	7500000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	4700000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	1200000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	31100000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Self Insurance DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance	24600000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	21400000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	40500000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	72800000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	56700000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	32900000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	28700000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	0	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	52800000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	178355000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	15300000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	11000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	126600000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	104100000	USD
CY2017Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability Undistributed Earnings Of Foreign Subsidiaries DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries	0	USD
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	10200000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11100000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11900000	USD
CY2017	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.75
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	169662000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	164915000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	188049000	USD
CY2017	us-gaap	Description Of Basis Of Accounting For Transactions Between Reportable Segments DescriptionOfBasisOfAccountingForTransactionsBetweenReportableSegments	Intercompany revenue and costs among the reportable segments are de minimis and accounted for as if the sales were to third parties because these items are based on negotiated fees between the segments involved. All intercompany transactions and balances are eliminated in consolidation. Intercompany revenue and costs between entities within a reportable segment are eliminated to arrive at segment totals. Eliminations between segments are separately presented.
CY2017	us-gaap	Description Of Defined Contribution Pension And Other Postretirement Plans DescriptionOfDefinedContributionPensionAndOtherPostretirementPlans	MasTec has a 401(k) plan covering all eligible employees. Subject to certain dollar limits, eligible employees may contribute up to 75% of their pre-tax annual compensation to the 401(k) plan. The Company’s matching contribution is equal to 100% of the first 3% of the employee’s salary and 50% of the next 2% of the employee’s salary, up to a maximum 4% employer match. Discretionary matching contributions, which are payable 50% in shares of MasTec common stock and 50% in cash, are paid quarterly.
CY2017	us-gaap	Description Of Types Of Products And Services From Which Each Reportable Segment Derives Its Revenues DescriptionOfTypesOfProductsAndServicesFromWhichEachReportableSegmentDerivesItsRevenues	All five reportable segments derive their revenue from the engineering, installation and maintenance of infrastructure, primarily in North America.
CY2016Q4	us-gaap	Due From Affiliate Noncurrent DueFromAffiliateNoncurrent	0	USD
CY2017Q4	us-gaap	Due From Affiliate Noncurrent DueFromAffiliateNoncurrent	0	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.98
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.03
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.30
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.70
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.63
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.01
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.79
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.98
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.29
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.98
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.03
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.30
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.69
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.61
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.029
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.002
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.144
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.001
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.003
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.99
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.77
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.95
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.22
CY2017	us-gaap	Earnings Per Share Reconciliation Disclosure EarningsPerShareReconciliationDisclosure	Basic earnings or loss per share is computed by dividing net income or loss attributable to MasTec by the weighted average number of common shares outstanding for the period, which excludes non-participating unvested restricted share awards. Diluted earnings per share is computed by dividing net income or loss attributable to MasTec by the weighted average number of fully diluted shares, as calculated under the treasury stock method, which includes the potential effect of dilutive common stock equivalents, such as issued but unvested restricted shares. If the Company reports a loss, rather than income, the computation of diluted loss per share excludes the effect of dilutive common stock equivalents, as their effect would be anti-dilutive.
CY2015	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1132000	USD
CY2016	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-1303000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-111000	USD
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.176
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.406
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.062
CY2015	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.043
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.027
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.036
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.019
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.323
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.010
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	-0.135
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.044
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.022
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.177
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.007
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Impairment Losses EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses	0.000
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.014
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.001
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.007
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.010
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.026
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.020
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.028
CY2015	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4200000	USD
CY2016	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5600000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	11200000	USD
CY2015	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	265910000	USD
CY2016	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	261433000	USD
CY2017	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	275103000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	988500000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	995874000	USD
CY2017	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	5935000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	1216000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Assets EquityMethodInvestmentSummarizedFinancialInformationAssets	1443100000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	89500000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Assets EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets	136800000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	153600000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Current Liabilities EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities	121200000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	1139600000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Liabilities EquityMethodInvestmentSummarizedFinancialInformationLiabilities	1097700000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-13300000	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	-200000	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Net Income Loss EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss	64500000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	1126500000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Assets EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets	1306300000	USD
CY2016Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	986000000	USD
CY2017Q4	us-gaap	Equity Method Investment Summarized Financial Information Noncurrent Liabilities EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities	976500000	USD
CY2015	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	0	USD
CY2016	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	0	USD
CY2017	us-gaap	Equity Method Investment Summarized Financial Information Revenue EquityMethodInvestmentSummarizedFinancialInformationRevenue	114500000	USD
CY2015	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	100000	USD
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	100000	USD
CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	5700000	USD
CY2017	us-gaap	Factors Used To Identify Entitys Reportable Segments FactorsUsedToIdentifyEntitysReportableSegments	MasTec manages its operations under five operating segments, which represent MasTec’s five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial and (5) Other. This structure is generally focused on broad end-user markets for MasTec’s labor-based construction services.
CY2015Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	129900000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	19800000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	19500000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	6900000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	8400000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	11000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	13400000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	79000000	USD
CY2015	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	8191000	USD
CY2016	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-1957000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	1137738000	USD
CY2017	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	138000000	USD
CY2015	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	78625000	USD
CY2016	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2017	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	225819000	USD
CY2016	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	1600000	USD
CY2017	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	3800000	USD
CY2015Q4	us-gaap	Goodwill Gross GoodwillGross	1057000000	USD
CY2017Q4	us-gaap	Goodwill Gross GoodwillGross	1212500000	USD
CY2015Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	68500000	USD
CY2017Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	74800000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-26500000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	202400000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	334900000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-67746000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	371826000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-41200000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	23400000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	36900000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	-79700000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	134000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	348900000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-7978000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3528000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	21328000	USD
CY2015	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2016	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2017	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11957000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	91784000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22942000	USD
CY2017Q4	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	120100000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	120100000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2536000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	59342000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	78653000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-162441000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	66078000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	54342000	USD
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-362275000	USD
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	246419000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	417491000	USD
CY2015	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	-5085000	USD
CY2016	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	12131000	USD
CY2017	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	46075000	USD
CY2015	us-gaap	Increase Decrease In Book Overdrafts IncreaseDecreaseInBookOverdrafts	4699000	USD
CY2016	us-gaap	Increase Decrease In Book Overdrafts IncreaseDecreaseInBookOverdrafts	4069000	USD
CY2017	us-gaap	Increase Decrease In Book Overdrafts IncreaseDecreaseInBookOverdrafts	-10459000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-22356000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	22232000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-36187000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	10775000	USD
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0	shares
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1022000	shares
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	11241000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-44650000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	117091000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-31954000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	31106000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-258920000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-29486000	USD
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1422000	shares
CY2015Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	329300000	USD
CY2015Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	199400000	USD
CY2016Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	179711000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	191142000	USD
CY2016Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	1175600000	USD
CY2017Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	1328900000	USD
CY2015	us-gaap	Interest Paid InterestPaid	47405000	USD
CY2016	us-gaap	Interest Paid InterestPaid	47698000	USD
CY2017	us-gaap	Interest Paid InterestPaid	59157000	USD
CY2015	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	-48055000	USD
CY2016	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	-50734000	USD
CY2017	us-gaap	Interest Revenue Expense Net InterestRevenueExpenseNet	-61011000	USD
CY2016Q4	us-gaap	Inventory Net InventoryNet	111031000	USD
CY2017Q4	us-gaap	Inventory Net InventoryNet	76992000	USD
CY2016Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	3500000	USD
CY2017Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	7700000	USD
CY2016Q4	us-gaap	Liabilities Liabilities	2079498000	USD
CY2017Q4	us-gaap	Liabilities Liabilities	2633223000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3183132000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	4066576000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	839990000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	963827000	USD
CY2016Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	278100000	USD
CY2017Q4	us-gaap	Liabilities Other Than Longterm Debt Noncurrent LiabilitiesOtherThanLongtermDebtNoncurrent	388700000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	961379000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	1280706000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	64600000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	87866000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	1026000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Including Current Maturities LongTermDebtAndCapitalLeaseObligationsIncludingCurrentMaturities	1368600000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal After Year Five LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalAfterYearFive	400000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Four LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearFour	46400000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Three LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearThree	57000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Maturities Repayments Of Principal In Year Two LongTermDebtAndCapitalLeaseObligationsMaturitiesRepaymentsOfPrincipalInYearTwo	65500000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Repayments Of Principal In Next Twelve Months LongTermDebtAndCapitalLeaseObligationsRepaymentsOfPrincipalInNextTwelveMonths	88300000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	724400000	USD
CY2016Q4	us-gaap	Minority Interest MinorityInterest	7103000	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	2554000	USD
CY2017	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1280000	USD
CY2017	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	31007000	USD
CY2015	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	32800000	USD
CY2016	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	70000000	USD
CY2017	us-gaap	Multiemployer Plan Contributions By Employer MultiemployerPlanContributionsByEmployer	102400000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	118155000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-128700000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-141021000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-272748000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	367413000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	205593000	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	70846000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	65455000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	99774000	USD
CY2017	us-gaap	Multiemployer Plans General Nature MultiemployerPlansGeneralNature	certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees, which require the Company to pay specified wages, provide certain benefits to their union employees and contribute certain amounts to MEPPs.
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	156263000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	-79110000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	-2700000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	24100000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	56300000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	53600000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	131263000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	41000000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	81700000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	63800000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	160800000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	347213000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-593000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2772000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	1671000	USD
CY2015	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	-79110000	USD
CY2016	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	131263000	USD
CY2017	us-gaap	Net Income Loss Attributable To Parent Diluted NetIncomeLossAttributableToParentDiluted	347213000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	15457000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	6795000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	12990000	USD
CY2017	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	3
CY2017	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	5	segment
CY2017	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	5	segment
CY2015	us-gaap	Number Of Reporting Units NumberOfReportingUnits	4
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	243700000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	90700000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	12300000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	19200000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	33900000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	57300000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	30300000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	55109000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	35763000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	55977000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	178824000	USD
CY2015	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	-38347000	USD
CY2016	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	2585000	USD
CY2017	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	1627000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-38347000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6537000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2102000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	3952000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	475000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1552000	USD
CY2015	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2400000	USD
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	6300000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	184172000	USD
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1480000	USD
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-4700000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-7222000	USD
CY2015	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	47523000	USD
CY2016	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	19822000	USD
CY2017	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	18843000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	100000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2015	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1100000	USD
CY2016	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	600000	USD
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	6200000	USD
CY2015	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	148000	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	4102000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	115995000	USD
CY2015	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	127480000	USD
CY2016	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	32169000	USD
CY2017	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	77105000	USD
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	84410000	USD
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	117114000	USD
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	123412000	USD
CY2015	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2016	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	0	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	22728000	USD
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000	shares
CY2016Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2016Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	41548000	USD
CY2017Q4	us-gaap	Prepaid Expense Current PrepaidExpenseCurrent	101270000	USD
CY2015	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1566000	USD
CY2016	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	4200000	USD
CY2017	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	-3085000	USD
CY2015	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	1702431000	USD
CY2016	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	1681424000	USD
CY2017	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	2699047000	USD
CY2015	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-2379000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	515000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-6301000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	69406000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	1125000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	23801000	USD
CY2015	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	13932000	USD
CY2016	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	11239000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	19963000	USD
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	500000	USD
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2100000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	-79703000	USD
CY2016Q2	us-gaap	Restructuring Charges RestructuringCharges	5100000	USD
CY2016Q1	us-gaap	Profit Loss ProfitLoss	-2900000	USD
CY2016Q2	us-gaap	Profit Loss ProfitLoss	24400000	USD
CY2016Q3	us-gaap	Profit Loss ProfitLoss	56500000	USD
CY2016Q4	us-gaap	Profit Loss ProfitLoss	55900000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	134035000	USD
CY2017Q1	us-gaap	Profit Loss ProfitLoss	40600000	USD
CY2017Q2	us-gaap	Profit Loss ProfitLoss	83300000	USD
CY2017Q3	us-gaap	Profit Loss ProfitLoss	64200000	USD
CY2017Q4	us-gaap	Profit Loss ProfitLoss	160700000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	348884000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1182200000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1455600000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	549084000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	706506000	USD
CY2016	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2900000	USD
CY2017	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2600000	USD
CY2015	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	57095000	USD
CY2016	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	57980000	USD
CY2017	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	67740000	USD
CY2015	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	1742077000	USD
CY2016	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	1627129000	USD
CY2017	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	2457293000	USD
CY2015	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	70900000	USD
CY2016	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	68700000	USD
CY2017	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	71100000	USD
CY2015	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	13843000	USD
CY2016	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	10694000	USD
CY2017	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	3350000	USD
CY2016Q1	us-gaap	Restructuring Charges RestructuringCharges	4100000	USD
CY2016Q3	us-gaap	Restructuring Charges RestructuringCharges	4700000	USD
CY2016Q4	us-gaap	Restructuring Charges RestructuringCharges	1400000	USD
CY2016Q4	us-gaap	Restructuring Reserve Current RestructuringReserveCurrent	5700000	USD
CY2017Q4	us-gaap	Restructuring Reserve Current RestructuringReserveCurrent	2200000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	509941000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	857154000	USD
CY2017Q4	us-gaap	Retained Earnings Undistributed Earnings From Equity Method Investees RetainedEarningsUndistributedEarningsFromEquityMethodInvestees	16900000	USD
CY2015	us-gaap	Revenues Revenues	4208330000	USD
CY2016Q1	us-gaap	Revenues Revenues	974200000	USD
CY2016Q2	us-gaap	Revenues Revenues	1232400000	USD
CY2016Q3	us-gaap	Revenues Revenues	1586200000	USD
CY2016Q4	us-gaap	Revenues Revenues	1341900000	USD
CY2016	us-gaap	Revenues Revenues	5134703000	USD
CY2017Q1	us-gaap	Revenues Revenues	1158200000	USD
CY2017Q2	us-gaap	Revenues Revenues	1890200000	USD
CY2017Q3	us-gaap	Revenues Revenues	1955800000	USD
CY2017Q4	us-gaap	Revenues Revenues	1602900000	USD
CY2017	us-gaap	Revenues Revenues	6606978000	USD
CY2017	us-gaap	Segment Reporting Description Of All Other Segments SegmentReportingDescriptionOfAllOtherSegments	The Other segment includes equity investees, the services of which vary from those provided by the Company’s four primary segments, as well as other small business units that perform construction and other services for a variety of international end-markets.
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	800000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1800000	USD
CY2017	us-gaap	Standard Product Warranty Description StandardProductWarrantyDescription	MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project.
CY2015	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	1024000	USD
CY2016	us-gaap	Stock Issued During Period Value Other StockIssuedDuringPeriodValueOther	2143000	USD
CY2015	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2016	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2015	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	544000	USD
CY2016	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2053000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	1096531000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1430799000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1148075000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	943391000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1103634000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1433353000	USD
CY2016Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	8094004	shares
CY2017Q4	us-gaap	Treasury Stock Common Shares TreasuryStockCommonShares	8132811	shares
CY2016Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	145573000	USD
CY2017Q4	us-gaap	Treasury Stock Common Value TreasuryStockCommonValue	147124000	USD
CY2015	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	100000000	USD
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1551000	USD
CY2017	us-gaap	Unapproved Change Orders Description UnapprovedChangeOrdersDescription	The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats such costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, and defers costs or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated. As of December 31, 2017 and 2016, the Company had approximately $146 million and $17 million, respectively, of change orders and/or claims that had been included as contract price adjustments on certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, arbitration and other proceedings. These contract price adjustments, which are included within costs and earnings in excess of billings or billed accounts receivable, as appropriate, represent management’s best estimate of contract revenue that has been earned and that management believes is probable of collection.
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8100000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	3200000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4900000	USD
CY2017	us-gaap	Valuation Allowance Methodologies And Assumptions ValuationAllowanceMethodologiesAndAssumptions	In assessing the ability to realize the deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which these temporary differences become deductible. Management considers the projected future taxable income and prudent and feasible tax planning strategies in making this assessment.
CY2014Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	33000000	USD
CY2015Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	28000000	USD
CY2016Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	42800000	USD
CY2017Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	83600000	USD
CY2015	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	2200000	USD
CY2016	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	24600000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	50200000	USD
CY2015	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	10300000	USD
CY2016	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	1000000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Charged To Other Accounts ValuationAllowancesAndReservesChargedToOtherAccounts	0	USD
CY2015	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	17500000	USD
CY2016	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	10800000	USD
CY2017	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	9400000	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	80489000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	81394000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	82325000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80489000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80372000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	80903000	shares
CY2017	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:justify;text-indent:48px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Certain prior year amounts have been reclassified to conform to the current period presentation.</font></div></div>
CY2017	us-gaap	Revenue Recognition Percentage Of Completion Method RevenueRecognitionPercentageOfCompletionMethod	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:justify;text-indent:48px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">Revenue from fixed price contracts provides for a fixed amount of revenue for the entire project, subject to certain additions for changed scope or specifications. Revenue from these contracts, as well as for certain projects pursuant to master and other service agreements, is recognized using the percentage-of-completion method, under which the percentage of revenue to be recognized for a given project is measured by the percentage of costs incurred to date on the contract to the total estimated costs for the contract. Such contracts provide that the customer accept completion of progress to date and compensate the Company for services rendered, which may be measured in terms of costs incurred, units installed, hours expended or some other measure of progress. Contract costs include all direct materials, labor and subcontracted costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and the operational costs of capital equipment. Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenue and costs. </font></div><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:justify;text-indent:48px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">The estimation process for revenue recognized under the percentage-of-completion method is based on the professional knowledge and experience of the Company’s project managers, engineers and financial professionals. Management reviews estimates of contract revenue and costs on an ongoing basis. Changes in job performance, job conditions and management’s assessment of expected contract settlements are factors that influence estimates of total contract value and total costs to complete those contracts and, therefore, the Company’s profit recognition. Changes in these factors may result in revisions to costs and income, and their effects are recognized in the period in which the revisions are determined, which could materially affect the Company’s results of operations in the period in which such changes are recognized. For both the years ended </font><font style="font-family:inherit;font-size:9pt;">December 31, 2017</font><font style="font-family:inherit;font-size:9pt;"> and </font><font style="font-family:inherit;font-size:9pt;">2016</font><font style="font-family:inherit;font-size:9pt;">, project profit was affected by less than </font><font style="font-family:inherit;font-size:9pt;">5%</font><font style="font-family:inherit;font-size:9pt;"> as a result of changes in contract estimates included in projects that were in process as of </font><font style="font-family:inherit;font-size:9pt;">December 31, 2016</font><font style="font-family:inherit;font-size:9pt;"> and </font><font style="font-family:inherit;font-size:9pt;">2015</font><font style="font-family:inherit;font-size:9pt;">, respectively. Provisions for losses on uncompleted contracts are made in the period in which such losses are determined to be probable and the amount can be reasonably estimated. The majority of fixed price contracts are completed within </font><font style="font-family:inherit;font-size:9pt;">one</font><font style="font-family:inherit;font-size:9pt;"> year.</font></div></div>
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:justify;text-indent:24px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-style:italic;font-weight:bold;">Management Estimates</font></div><div style="line-height:120%;padding-bottom:8px;padding-top:8px;text-align:justify;text-indent:48px;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;">The preparation of consolidated financial statements in accordance with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. These estimates are based on historical experience and various other assumptions, the results of which form the basis of making judgments about the Company’s operating results and the carrying values of assets and liabilities that are not readily apparent from other sources. Key estimates include: the recognition of revenue and project profit or loss, which the Company defines as project revenue, less project costs of revenue, including project-related depreciation, in particular, on construction contracts accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete and the amount of probable contract price adjustments; allowances for doubtful accounts; fair value estimates, including those related to business acquisitions, valuations of goodwill and intangible assets, acquisition-related contingent consideration and equity investments; asset lives used in computing depreciation and amortization; fair values of financial instruments; self-insurance liabilities; other accruals and allowances; income taxes; and the estimated effects of litigation and other contingencies. While management believes that such estimates are reasonable when considered in conjunction with the Company’s consolidated financial position and results of operations taken as a whole, actual results could differ materially from those estimates.</font></div></div>

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$MTZ
MasTec Inc Stock $mtz

2016 Q4 Form 10-K Financial Statement

#000001561518000007 Filed on February 27, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MTZ MasTec Inc Stock $mtz

2016 Q4 Form 10-K Financial Statement

#000001561518000007 Filed on February 27, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MTZ
MasTec Inc Stock $mtz