MasTec (MTZ) 10-Q 5 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 02, 2016
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Entity Registrant Name	MASTEC INC
Trading Symbol	MTZ
Entity Central Index Key	15,615
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		82,253,330

Condensed Unaudited Consolidate

Condensed Unaudited Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 974,225	$ 1,003,268
Costs of revenue, excluding depreciation and amortization	884,401	886,414
Depreciation and amortization	39,008	42,598
General and administrative expenses	60,048	74,030
Interest expense, net	12,158	10,973
Equity in (earnings) losses of unconsolidated affiliates	(3,066)	585
Other income, net	(13,356)	(592)
Loss before income taxes	(4,968)	(10,740)
Benefit from income taxes	2,087	4,352
Net loss	(2,881)	(6,388)
Net loss attributable to non-controlling interests	(189)	(125)
Net loss attributable to MasTec, Inc.	$ (2,692)	$ (6,263)
Earnings per share (Note 2):
Basic loss per share	$ (0.03)	$ (0.08)
Basic weighted average common shares outstanding	80,156	82,397
Diluted loss per share	$ (0.03)	$ (0.08)
Diluted weighted average common shares outstanding	80,156	82,397

Condensed Unaudited Consolidat3

Condensed Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,881)	$ (6,388)
Other comprehensive income (loss) (Note 11):
Foreign currency translation gains (losses), net of tax	5,624	(22,028)
Unrealized losses on equity method investment activity, net of tax	(8,010)	0
Comprehensive loss	(5,267)	(28,416)
Comprehensive loss attributable to non-controlling interests	(189)	(125)
Comprehensive loss attributable to MasTec, Inc.	$ (5,078)	$ (28,291)

Condensed Unaudited Consolidat4

Condensed Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 3,885	$ 4,984
Accounts receivable, net of allowance	970,886	911,106
Inventories, net	99,405	90,599
Prepaid expenses	50,592	54,879
Other current assets	73,768	68,190
Total current assets	1,198,536	1,129,758
Property and equipment, net	547,957	558,667
Goodwill	991,975	988,511
Other intangible assets, net	197,503	199,379
Other long-term assets	50,657	51,032
Total assets	2,986,628	2,927,347
Current liabilities:
Current maturities of long-term debt	74,055	77,400
Accounts payable	363,142	348,543
Accrued salaries and wages	73,125	46,550
Other accrued expenses	59,245	69,369
Acquisition-related contingent consideration, current	17,026	17,731
Billings in excess of costs and earnings	177,678	149,483
Other current liabilities	47,391	43,459
Total current liabilities	811,662	752,535
Acquisition-related contingent consideration, net of current portion	40,626	41,675
Long-term debt	938,722	932,868
Long-term deferred tax liabilities, net	174,396	188,759
Other long-term liabilities	77,361	68,119
Total liabilities	$ 2,042,767	$ 1,983,956
Commitments and contingencies (See Note 14)
Equity
Preferred stock, $1.00 par value: authorized shares - 5,000,000; issued and outstanding shares – none	$ 0	$ 0
Common stock, $0.10 par value: authorized shares - 145,000,000; issued shares - 90,314,373 (including 1,952,832 of unvested restricted shares) and 88,197,474 as of March 31, 2016 and December 31, 2015, respectively	8,836	8,820
Capital surplus	775,717	769,996
Retained earnings	375,986	378,678
Accumulated other comprehensive loss	(74,737)	(72,351)
Treasury stock, at cost: 8,094,004 shares as of both March 31, 2016 and December 31, 2015	(145,573)	(145,573)
Total MasTec, Inc. shareholders’ equity	940,229	939,570
Non-controlling interests	3,632	3,821
Total equity	943,861	943,391
Total liabilities and equity	$ 2,986,628	$ 2,927,347

Condensed Unaudited Consolidat5

Condensed Unaudited Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2016	Dec. 31, 2015
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized	145,000,000	145,000,000
Common stock, shares issued	90,314,373	88,197,474
Treasury stock, shares	8,094,004	8,094,004
Restricted Shares [Member]
Unvested restricted shares, included in shares issued	1,952,832

Condensed Unaudited Consolidat6

Condensed Unaudited Consolidated Statements of Cash Flows - USD ($)		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss		$ (2,881,000)	$ (6,388,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		39,008,000	42,598,000
Non-cash interest expense, net		736,000	639,000
Non-cash stock-based compensation expense		3,523,000	3,575,000
Excess tax benefit from stock-based compensation	[1]	(248,000)	0
Benefit from deferred income taxes		(4,369,000)	(6,693,000)
Other non-cash items		881,000	473,000
Gains on sales of assets		(1,025,000)	(441,000)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable		(54,992,000)	150,006,000
Inventories		(9,090,000)	12,278,000
Other assets, current and long-term portion		25,255,000	(2,841,000)
Accounts payable and accrued expenses		23,245,000	(78,700,000)
Billings in excess of costs and earnings		28,038,000	(7,510,000)
Book overdrafts		(3,712,000)	7,861,000
Other liabilities, current and long-term portion		(28,518,000)	3,969,000
Net cash provided by operating activities		15,851,000	118,826,000
Cash flows used in investing activities:
Cash paid for acquisitions, net of cash acquired		0	(148,000)
Capital expenditures		(13,343,000)	(19,660,000)
Proceeds from sale of property and equipment		2,237,000	1,360,000
Payments for other investments		(1,514,000)	(31,959,000)
Net cash used in investing activities		(12,620,000)	(50,407,000)
Cash flows used in financing activities:
Proceeds from credit facilities		335,747,000	439,507,000
Repayments of credit facilities		(320,742,000)	(404,776,000)
Repayments of other borrowings		(6,543,000)	(3,115,000)
Payments of capital lease obligations		(14,175,000)	(12,110,000)
Repurchase of common stock		0	(83,261,000)
Proceeds from stock-based awards, net of tax withholdings		1,817,000	925,000
Excess tax benefit from stock-based compensation		248,000	0
Net cash used in financing activities		(3,648,000)	(62,830,000)
Effect of currency translation on cash		(682,000)	(957,000)
Net (decrease) increase in cash and cash equivalents		(1,099,000)	4,632,000
Cash and cash equivalents - beginning of period		4,984,000	24,059,000
Cash and cash equivalents - end of period		3,885,000	28,691,000
Supplemental cash flow information:
Interest paid		15,828,000	15,633,000
Income taxes paid, net of refunds		2,295,000	1,473,000
Supplemental disclosure of non-cash information:
Equipment acquired under capital lease		0	4,011,000
Accrued capital expenditures		6,806,000	3,627,000
Equipment [Member]
Supplemental disclosure of non-cash information:
Equipment acquired under financing arrangements		$ 0	$ 5,758,000
[1]	Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows. There were no excess tax benefits for the three month period ended March 31, 2015.

Business, Basis of Presentation

Business, Basis of Presentation and Significant Accounting Policies	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Business, Basis of Presentation and Significant Accounting Policies	Note 1 – Business, Basis of Presentation and Significant Accounting Policies Nature of the Business MasTec, Inc. (collectively with its subsidiaries, “MasTec” or the “Company”) is a leading infrastructure construction company operating mainly throughout North America across a range of industries. The Company’s primary activities include the engineering, building, installation, maintenance and upgrade of communications, energy and utility infrastructure, such as: wireless, wireline/fiber and satellite communications; petroleum and natural gas pipeline infrastructure; electrical utility transmission and distribution; power generation; and industrial infrastructure. MasTec’s customers are primarily in these industries. MasTec reports its results under five reportable segments: (1) Communications; (2) Oil and Gas; (3) Electrical Transmission; (4) Power Generation and Industrial; and (5) Other. Basis of Presentation The accompanying condensed unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The accompanying condensed consolidated balance sheet as of December 31, 2015 is derived from the Company’s audited financial statements as of that date. Because certain information and footnote disclosures have been condensed or omitted, these condensed unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto as of and for the year ended December 31, 2015 contained in the Company’s 2015 Annual Report on Form 10-K (the “ 2015 Form 10-K”). In management’s opinion, all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. Certain prior year amounts have been reclassified to conform to the current period presentation. Interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. The Company believes that the disclosures made in these condensed unaudited consolidated financial statements are adequate to make the information not misleading. In these condensed unaudited consolidated financial statements, “$” means U.S. dollars unless otherwise noted. Principles of Consolidation The accompanying condensed unaudited consolidated financial statements include MasTec, Inc. and its subsidiaries and include the accounts of all majority owned subsidiaries over which the Company exercises control and, when applicable, entities in which the Company has a controlling financial interest. Other parties’ interests in companies for which MasTec exercises control and has a controlling financial interest are reported as non-controlling interests within equity. Net income or loss attributable to non-controlling interests is reported as a separate line item below net income or loss. The Company’s investments in entities in which the Company does not have a controlling interest, but for which it has the ability to exert significant influence, are accounted for using the equity method of accounting. Equity method investments are recorded as other long-term assets or, for investments in a net liability position, within other long-term liabilities in the condensed unaudited consolidated balance sheets. Income or loss from these investments is recorded as a separate line item in the condensed unaudited consolidated statements of operations. Intercompany profits or losses associated with the Company’s equity method investments are eliminated until realized by the investee. The cost method is used for investments in entities in which the Company does not have the ability to exert significant influence. All significant intercompany balances and transactions have been eliminated in consolidation. The assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange during the applicable period. Substantially all of the Company’s foreign operations use the local currency as the functional currency. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have subsidiaries that operate in highly inflationary environments. Investments in Affiliates and Other Entities In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may include financing arrangements, such as the extension of loans. See Note 4 - Fair Value of Financial Instruments and Note 15 - Related Party Transactions for discussion pertaining to certain of the Company’s cost and equity method investments and other investment arrangements. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the primary activities of the VIE and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest. As of March 31, 2016 , the Company determined that certain of its investment arrangements were VIEs, but that it was not the primary beneficiary. In arrangements in which the Company has an undivided interest in the assets, liabilities, revenues and profits or losses of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity. Management Estimates The preparation of financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. 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 depreciation), in particular, on long-term construction contracts, or other projects accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete projects, ultimate project profit and the amount of contract price adjustments that are probable; allowances for doubtful accounts; estimated fair values of goodwill and intangible assets and liabilities, acquisition-related contingent consideration and investments in cost and equity method investees; asset lives used in computing depreciation and amortization; accrued self-insured claims; share-based compensation; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. 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 from those estimates and such differences could be material to the condensed unaudited consolidated financial statements. Significant Accounting Policies Revenue Recognition Revenue is derived from projects performed under master and other service agreements as well as from fixed price contracts for specific projects or jobs requiring the construction and installation of an entire infrastructure system or specified units within an entire infrastructure system. The Company frequently provides maintenance, installation and repair work under unit price or fixed price master service or other service agreements that are renewed on a periodic basis. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects performed under master service and other service agreements totaled 50% and 52% of revenue for the three month periods ended March 31, 2016 and 2015 , respectively. The Company also performs services under master and other service agreements on a fixed fee basis, under which MasTec furnishes specified units of service for a fixed price per unit of service and revenue is recognized as the services are rendered. 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 (excluding certain depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenue and costs. 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 final contract settlements are factors that influence management’s assessment of total contract value and total estimated 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. Excluding the effects of project losses of: $13.5 million on a western Canadian oil and gas project and $15.1 million on an Electrical Transmission project for the three month period ended March 31, 2016 , and project losses of $16.0 million on a Canadian wind project and $5.5 million on a proportionately consolidated non-controlled Canadian joint venture for the three month period ended March 31, 2015, project profit was affected by less than 5% for the three month periods ended March 31, 2016 and 2015 as a result of changes in contract estimates included in projects that were in process as of December 31, 2015 and 2014, 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 one year. 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 project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/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 March 31, 2016 and December 31, 2015 , the Company had approximately $20 million and $38 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 or will be earned and that management believes is probable of collection. As of March 31, 2016 , these change orders were primarily related to contracts in the Oil and Gas segment, and as of December 31, 2015 , the Oil and Gas and Electrical Transmission segments. The Company actively engages in substantive meetings with its customers to complete the final approval process, and generally expects these processes to be completed within one year. The amounts ultimately realized upon final acceptance by its customers could be higher or lower than such estimated amounts. Billings in excess of costs and estimated earnings on uncompleted contracts are classified as current liabilities. Costs and estimated earnings in excess of billings, or work in process, is classified within current assets for the majority of the Company’s projects. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms. Recently Issued Accounting Pronouncements There have been no changes in the expected dates of adoption or estimated effects on the Company’s consolidated financial statements of recently issued accounting pronouncements from those disclosed in the Company’s 2015 Form 10-K. Recently Issued Accounting Pronouncements Not Yet Adopted In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 is intended to improve and simplify the accounting for share-based payment transactions. Under ASU 2016-09, when share-based payment awards vest or are settled, excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) are to be recognized in the income statement, rather than as additional paid-in-capital, and these tax effects will be presented within the statement of cash flows as an operating cash flow, rather than as a financing activity. The recognition of the income tax effects of share-based payment awards in the income statement will also affect the computation of dilutive common stock equivalents as calculated under the treasury stock method, as windfalls will no longer be included in assumed proceeds from outstanding awards. ASU 2016-09 increases the amount an employer can withhold to cover statutory employee tax withholdings, and requires that payments to taxing authorities for such employee withholdings be presented as a financing activity. ASU 2016-09 also provides for an accounting policy election for forfeitures, whereby forfeitures can either be estimated or accounted for as incurred. ASU 2016-09 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted if all provisions of the standard are early adopted. The Company is currently evaluating the expected adoption method and potential effect of this ASU on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) (“ASU 2016-08”), in April 2016 issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing (“ASU 2016-10”), and in May 2016, issued ASU 2016-11, Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting (“ASU 2016-11”) . ASU 2016-08 clarifies principal versus agent considerations relating to when another party, along with the entity, is involved in providing a good or service to a customer. ASU 2016-08 requires an entity to determine whether the nature of its promise is to provide a good or service to a customer, or to arrange for the good or service to be provided to the customer by the other party. This determination is based upon whether the entity controls the good or service before it is transferred to the customer. When the entity that satisfies a performance obligation is the principal, the entity recognizes the gross amount of consideration as revenue. When the entity that satisfies the performance obligation is the agent, it recognizes the amount of any fee or commission as revenue. ASU 2016-10 clarifies the guidance in Topic 606 for identifying performance obligations in a contract as well as the implementation guidance pertaining to revenue recognition related to licensing arrangements. ASU 2016-11 rescinds several SEC Staff Announcements that are codified in Topic 605, including, among other items, guidance relating to accounting for consideration given by a vendor to a customer, as well as accounting for shipping and handling fees and freight services. The effective date and transition requirements for the amendments in ASU 2016-08 and ASU 2016-10 are the same as the effective date and transition requirements of ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which is effective for fiscal years, and for interim periods within those years, beginning after December 15, 2017. The Company is evaluating the potential effect of these ASUs on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, Investments-Equity Method and Joint Ventures (Topic 323: Simplifying the Transition to the Equity Method of Accounting (“ASU 2016-07”). ASU 2016-07 eliminates the requirement that an investor retrospectively apply the equity method of accounting when an investment becomes qualified for the equity method of accounting as a result of an increase in the level of ownership or degree of influence. ASU 2016-07 requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. ASU 2016-07 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016, on a prospective basis. Early adoption is permitted. The Company does not expect that this ASU will have a material effect on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments (a consensus of the FASB Emerging Issues Task Force) (“ASU 2016-06”) and ASU 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships (a consensus of the FASB Emerging Issues Task Force) (“ASU 2016-05”). ASU 2016-06 clarifies the requirements for assessing whether contingent call or put options that can accelerate repayment are clearly and closely related to the economic characteristics and risk of the lost contract. When a call or put option is contingently exercisable, an entity does not have to assess whether the event that triggers the ability to exercise the option is related to interest rates or credit risk. An entity is only required to assess the embedded call or put option in accordance with the four-step decision sequence under current GAAP. ASU 2016-06 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016, on a modified retrospective basis. Early adoption is permitted. ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument is not, in and of itself, considered to be a termination of the original derivative instrument, which would discontinue the application of hedge accounting, provided that all other hedge accounting criteria continue to be met. ASU 2016-05 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. ASU 2016-05 is effective either prospectively or on a modified retrospective basis. The Company does not expect these ASUs to have an effect on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Subtopic 842) (“ASU 2016-02”). ASU 2016-02 provides revised guidance for lease accounting and related disclosure requirements, including a requirement for lessees to recognize lease assets and lease liabilities for operating leases with a duration of greater than one year. Under the previous guidance, lessees were not required to recognize assets and liabilities for operating leases on the balance sheet. ASU 2016-02 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. Modified retrospective application is required for all relevant prior periods. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. Upon adoption, the Company expects to recognize lease assets and liabilities for certain of its operating leases on the Company’s consolidated balance sheets. Recently Issued Accounting Pronouncements Adopted as of January 1, 2016 In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03” ), which requires that debt issuance costs related to a recognized debt liability be presented as a direct deduction from the carrying amount of the debt. The adoption of ASU 2015-03 resulted in the reclassification of $12.9 million of deferred financing costs associated with the Company’s credit facility and senior notes from other current and other long-term assets to current and long-term debt as of December 31, 2015, which amount was composed of approximately $5.5 million , $1.0 million and $6.4 million related to the Company’s credit facility, term loan and 4.875% senior notes, respectively. See Note 7 - Debt.

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Note 2 – Earnings Per Share Basic earnings or loss per share is computed by dividing net income or loss available to MasTec’s common shareholders by the weighted average number of common shares outstanding for the period. For purposes of calculating basic and diluted earnings per share, vested restricted stock awards are considered outstanding. Diluted earnings per share is computed by dividing net income available to MasTec’s common shareholders by the weighted average number of fully diluted shares, as calculated under the treasury stock method, which includes the effect of dilutive common stock equivalents, including from the exercise of outstanding stock options or the vesting of unvested restricted shares. If the Company reports a loss, rather than income, the computation of diluted loss per share excludes dilutive common stock equivalents, as their effect would be anti-dilutive. For the three month periods ended March 31, 2016 and 2015, the Company reported a net loss, which resulted in the exclusion of 610,657 and 502,217 weighted average dilutive common stock equivalents, respectively, from the calculation of diluted net loss per share. Total anti-dilutive weighted average common stock equivalents for the three month periods ended March 31, 2016 and 2015 , including the shares previously mentioned, were 615,143 and 807,567 , respectively. The following table provides details underlying the Company’s earnings per share calculations for the periods indicated (in thousands): For the Three Months Ended March 31, 2016 2015 Net loss attributable to MasTec: Net loss - basic and diluted (a) $ (2,692 ) $ (6,263 ) Weighted average shares outstanding: Weighted average shares outstanding - basic 80,156 82,397 Dilutive common stock equivalents — — Weighted average shares outstanding - diluted 80,156 82,397 (a) Calculated as total net loss less amounts attributable to non-controlling interests.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 3 - Goodwill and Other Intangible Assets The following table provides details of goodwill by reportable segment (in millions): Communications Oil and Gas Electrical Transmission Power Generation and Industrial Total Goodwill Goodwill, gross carrying amount $ 414.9 $ 381.8 $ 149.9 $ 117.6 $ 1,064.2 Accumulated impairment losses — (72.2 ) — — (72.2 ) Goodwill, net, as of March 31, 2016 $ 414.9 $ 309.6 $ 149.9 $ 117.6 $ 992.0 Currency translation gains related to goodwill totaled $3.5 million , net, which amount was comprised of a currency translation loss of $3.7 million related to accumulated impairment losses, and a currency translation gain of $7.2 million related to the gross carrying amount of goodwill, for the three month period ended March 31, 2016 . Currency translation losses totaled $12.2 million for the three month period ended March 31, 2015 . There were no additions to goodwill from new business combinations or accruals of acquisition-related contingent consideration in either of the three month periods ended March 31, 2016 or 2015. The following table provides a reconciliation of changes in other intangible assets for the period indicated (in millions): Other Intangible Assets Non-amortizing Amortizing Trade Names Pre-Qualifications Customer Relationships and Backlog Other (a) Total Other intangible assets, gross carrying amount as of December 31, 2015 $ 34.8 $ 73.4 $ 195.4 $ 25.7 $ 329.3 Accumulated amortization (114.6 ) (15.3 ) (129.9 ) Other intangible assets, net, as of December 31, 2015 $ 34.8 $ 73.4 $ 80.8 $ 10.4 $ 199.4 Amortization expense (4.2 ) (1.1 ) (5.3 ) Currency translation adjustments — 2.7 0.6 0.1 3.4 Other intangible assets, net, as of March 31, 2016 $ 34.8 $ 76.1 $ 77.2 $ 9.4 $ 197.5 (a) Consists principally of trade names and non-compete agreements. Amortization expense associated with intangible assets for the three month periods ended March 31, 2016 and 2015 totaled $5.3 million and $7.3 million , respectively.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Note 4 – Fair Value of Financial Instruments The Company’s financial instruments include cash and cash equivalents, accounts and notes receivable, cash collateral deposited with insurance carriers, life insurance assets, cost and equity method investments, deferred compensation plan assets and liabilities, accounts payable and other current liabilities, acquisition-related contingent consideration, certain intangible assets and liabilities, including off-market contracts and debt obligations. Fair value is the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value guidance establishes a valuation hierarchy, which requires maximizing the use of observable inputs when measuring fair value. The three levels of inputs that may be used are: (i) Level 1 - quoted market prices in active markets for identical assets or liabilities; (ii) Level 2 - observable market-based inputs or other observable inputs; and (iii) Level 3 - significant unobservable inputs that cannot be corroborated by observable market data, which are generally determined using valuation models incorporating management estimates of market participant assumptions. In instances in which the inputs used to measure fair value fall into different levels of the fair value hierarchy, the fair value measurement classification is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Management’s assessment of the significance of a particular item to the fair value measurement in its entirety requires judgment, including the consideration of inputs specific to the asset or liability. Fair values of financial instruments are estimated using public market prices, quotes from financial institutions and other available information. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and other current liabilities approximate their fair values. Management believes the carrying values of notes receivable, cash collateral deposited with insurance carriers, deferred compensation plan assets and liabilities and outstanding balances on its credit facilities approximate their fair values. Cost and equity method investments are initially recorded at their cost basis. Assets and Liabilities Measured at Fair Value on a Recurring Basis As of March 31, 2016 and December 31, 2015 , financial instruments required to be measured at fair value on a recurring basis consisted primarily of acquisition-related contingent consideration liabilities, which represent the estimated fair value of additional future earn-outs payable for acquisitions of businesses (“ASC 805 contingent consideration”), in accordance with U.S. GAAP. The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions, which are Level 3 inputs, and is evaluated on an ongoing basis. As of March 31, 2016 and December 31, 2015 , the fair value of the Company’s ASC 805 contingent consideration totaled $56.7 million and $58.4 million , respectively. There were no additions to ASC 805 contingent consideration from new business combinations for the three month periods ended March 31, 2016 or 2015, and the Company made no payments in connection with ASC 805 contingent consideration in either of the three month periods ended March 31, 2016 or 2015. For the three month period ended March 31, 2016 , the Company recognized a net reduction of $2.3 million of ASC 805 contingent consideration related to certain of the Company’s western Canadian oil and gas businesses due to the combination of finalization of completed earn-out arrangements and adjustments to expected future period earn-out obligations. These adjustments were recorded within other income, net, in the condensed unaudited consolidated statements of operations. Foreign currency translation losses associated with ASC 805 contingent consideration, which are included within other comprehensive income, totaled $0.6 million for the three month period ended March 31, 2016 , and for the three month period ended March 31, 2015 , foreign currency translation gains totaled $4.6 million . Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis Assets and liabilities recognized or disclosed at fair value on a non-recurring basis, for which remeasurement occurs in the event of an impairment or other measurement event, if applicable, include items such as cost and equity method investments, life insurance assets, long-lived assets, goodwill, other intangible assets and liabilities, including off-market contracts, and debt. As of both March 31, 2016 and December 31, 2015 , the carrying amount of the Company’s 4.875% senior notes due 2023 (the “4.875% Senior Notes”) totaled $400 million . As of March 31, 2016 and December 31, 2015 , the estimated fair value of the Company’s 4.875% Senior Notes, based on quoted market prices in active markets, a Level 1 input , totaled $354.0 million and $344.0 million , respectively. Cost and Equity Method Investments. The aggregate carrying value of the Company’s cost and equity method investment assets totaled approximately $20.4 million and $16.7 million as of March 31, 2016 and December 31, 2015 , respectively. The Company’s cost and equity method investments as of March 31, 2016 include: (i) the Company’s equity interests in Trans-Pecos Pipeline, LLC (“TPP”) and Comanche Trail Pipeline, LLC (“CTP,” and together with TPP, the “Waha JVs”), for which a subsidiary of MasTec has commenced construction of the related pipelines; (ii) the Company’s equity interests in two joint ventures, which are in final stages of liquidation, resulting from the acquisition of Pacer Construction Holdings Corporation and its affiliated operating companies (collectively, “Pacer”), as discussed below, and; (iii) a $15 million cost investment in Cross Country Pipeline Supply, Inc. (“CCP”), which is a related party, as discussed in Note 15 - Related Party Transactions. For the three month period ended March 31, 2016 , revenue recognized by the Company in connection with work performed for the Waha JVs totaled $10.3 million , for which the corresponding pipeline construction intercompany profit was eliminated. As of March 31, 2016 , receivables from the Waha JVs totaled $8.3 million . The Company has issued letters of credit as collateral for its equity commitments to the Waha JVs, and to collateralize the Company’s share of the Waha JVs borrowings, totaling $155 million and $86 million as of March 31, 2016 and December 31, 2015 , respectively, which amounts include $78 million as collateral for its equity commitments to the joint ventures (the “Equity LC Amount”). During April 2016, the Company increased the face amount of the letters of credit by approximately $10 million to $165 million . The Company expects the face amount of the letters of credit to be reduced in the second quarter of 2016 after the Waha JVs obtain certain required regulatory approvals, leaving only the Equity LC Amount outstanding. In addition, TPP and CTP are party to certain interest rate swaps, which are guaranteed by TPP and CTP’s equity investors, including MasTec, for their proportionate share of any potential losses associated with early termination of the swaps until TPP and CTP obtain certain required regulatory approvals. The Company is subject to its proportionate share of any unrealized fair market value gains or losses from fluctuations in interest rates associated with these swaps. For the three month period ended March 31, 2016 , the Company’s proportionate share of unrecognized unrealized fair market value losses on interest rate swaps totaled approximately $13.0 million , or $8.0 million , net of tax, which proportionate share was included within other comprehensive loss. As of March 31, 2016 and December 31, 2015 , the Company’s investment in the Waha JVs represented a net liability position within the Company’s consolidated balance sheets, totaling $18.0 million and $4.4 million , respectively, related primarily to unrealized fair market value losses on the Waha JVs interest rate swaps. In connection with the Pacer acquisition, the Company acquired equity interests in two joint ventures. As of March 31, 2016 , outstanding receivables from these entities for work performed by Pacer totaled $4.0 million . These entities are in the final stages of liquidation, and have entered into receivership arrangements to assist with the orderly wind-down of their operations. During the first quarter of 2016, the Company recorded $3.6 million of earnings related to increases in expected recoveries from these investments. Pacer has provided $39.9 million of receiver financing, of which $12.8 million has been repaid as of March 31, 2016 . The remaining amount paid to the receiver, which Pacer believes will be repaid within the next twelve months, is recorded within other current assets in the consolidated balance sheet as of March 31, 2016 . There are no financial guarantees associated with, or remaining amounts expected to be advanced to, these entities as of March 31, 2016 . All jobs related to these entities were complete as of March 31, 2016 and the Company believes any remaining exposure to be insignificant. The obligations and guarantees associated with these entities represent variable interests, however, Pacer does not have the power to control the primary activities of these entities. The fair values of the Company’s cost and equity method investments are not readily available. The Company is not aware of events or changes in circumstances that would have a significant adverse effect on the carrying values of its cost and/or equity method investments as of March 31, 2016 or December 31, 2015 .

Accounts Receivable, Net of All

Accounts Receivable, Net of Allowance	3 Months Ended
	Mar. 31, 2016
Receivables [Abstract]
Accounts Receivable, Net of Allowance	Note 5 - Accounts Receivable, Net of Allowance The following table provides details of accounts receivable, net of allowance, as of the dates indicated (in millions): March 31, December 31, Contract billings $ 478.9 $ 437.3 Retainage 145.5 148.8 Costs and earnings in excess of billings 354.0 332.7 Accounts receivable, gross $ 978.4 $ 918.8 Less allowance for doubtful accounts (7.5 ) (7.7 ) Accounts receivable, net $ 970.9 $ 911.1 Retainage, which has been billed, but is not due until the Company’s completion of performance and acceptance by customers, is generally expected to be collected within one year. Receivables expected to be collected beyond one year are recorded within other long-term assets. Provisions for doubtful accounts for the three month periods ended March 31, 2016 and 2015 totaled $0.4 million and $0.5 million , respectively. In the ordinary course of business, the Company has entered into certain non-recourse financing arrangements, under which receivables are purchased by the customer’s bank for a nominal fee. These arrangements improve the collection cycle time of the related receivables. The discount charges, which are included within interest expense in the consolidated statements of operations, were immaterial for the three month periods ended March 31, 2016 and 2015 .

Property and Equipment, Net

Property and Equipment, Net	3 Months Ended
	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	Note 6 - Property and Equipment, Net The following table provides details of property and equipment, net, including property and equipment held under capital leases as of the dates indicated (in millions): March 31, December 31, Land $ 4.6 $ 4.6 Buildings and leasehold improvements 21.9 21.7 Machinery and equipment 923.4 912.9 Office furniture and equipment 140.3 136.9 Construction in progress 13.7 10.8 Total property and equipment $ 1,103.9 $ 1,086.9 Less accumulated depreciation and amortization (555.9 ) (528.2 ) Property and equipment, net $ 548.0 $ 558.7 The gross amount of capitalized internal-use software, which is included within office furniture and equipment, totaled $104.7 million and $101.4 million as of March 31, 2016 and December 31, 2015 , respectively. Capitalized internal-use software, net of accumulated amortization, totaled $34.2 million and $33.4 million as of March 31, 2016 and December 31, 2015 , respectively. Depreciation and amortization expense associated with property and equipment for the three month periods ended March 31, 2016 and 2015 totaled $33.7 million and $35.3 million , respectively.

Debt

Debt	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Debt	Note 7 - Debt The following table provides details of the carrying values of debt as of the dates indicated (in millions): Description Maturity Date March 31, December 31, Senior secured credit facility: Revolving loans October 29, 2018 $ 230.9 $ 208.5 Term loan November 21, 2019 246.9 250.0 4.875% Senior Notes March 15, 2023 400.0 400.0 Other credit facilities Varies 14.9 16.4 Capital lease obligations, weighted average interest rate of 2.8% In installments through June 13, 2021 117.9 130.9 Notes payable, equipment, weighted average interest rate of 2.8% In installments through May 31, 2018 14.2 17.4 Total debt $ 1,024.8 $ 1,023.2 Less unamortized deferred financing costs (12.0 ) (12.9 ) Less current maturities (74.1 ) (77.4 ) Long-term debt $ 938.7 $ 932.9 Senior Secured Credit Facility The Company has a senior secured credit facility, referred to as the Credit Facility. Under the Credit Facility, aggregate borrowing commitments total approximately $1.25 billion , composed of $1.0 billion of revolving commitments and a term loan in the principal amount of $247 million (the “Term Loan”). As of March 31, 2016 and December 31, 2015 , outstanding revolving loans under the Credit Facility accrued interest at weighted average rates of approximately 3.38% and 2.95% per annum, respectively, and the Term Loan accrued interest at a rate of 2.43% and 2.42% as of March 31, 2016 and December 31, 2015 , respectively. Letters of credit of approximately $403.8 million and $292.8 million were issued as of March 31, 2016 and December 31, 2015 , respectively. As of both March 31, 2016 and December 31, 2015 , letter of credit fees accrued at 1% per annum for performance standby letters of credit and at 2% for financial standby letters of credit. Outstanding letters of credit mature at various dates and most have automatic renewal provisions, subject to prior notice of cancellation. As of March 31, 2016 and December 31, 2015 , borrowing capacity of $365.3 million and $498.7 million , respectively, was available for revolving loans, or up to $46.2 million and $157.2 million , respectively, for new letters of credit. Borrowing capacity as of March 31, 2016 and December 31, 2015 included $104.6 million and $111.8 million , respectively, of availability in either Canadian dollars or Mexican pesos. The unused facility fee was 0.40% as of both March 31, 2016 and December 31, 2015 . The Credit Facility is guaranteed by certain subsidiaries of the Company (the “Guarantor Subsidiaries”), and the obligations under the Credit Facility are secured by substantially all of the Company’s and the Guarantor Subsidiaries’ respective assets, subject to certain exceptions. Other Credit Facilities . The Company has other credit facilities that support the working capital requirements of its foreign operations. Borrowings under these credit facilities, which have varying dates of maturity and are generally renewed on an annual basis, are primarily denominated in Canadian dollars. Maximum borrowing capacity totaled Canadian $40.0 million as of both March 31, 2016 and December 31, 2015 , or approximately $30.8 million and $28.9 million , respectively. Outstanding borrowings totaled approximately $14.9 million and $16.4 million as of March 31, 2016 and December 31, 2015 , respectively. Outstanding borrowings accrued interest at a weighted average rate of 3.6% as of both March 31, 2016 and December 31, 2015 . Outstanding borrowings that are not renewed are repaid with borrowings under the Credit Facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities are classified within long-term debt in the Company’s consolidated balance sheets. The Company’s other credit facilities are subject to customary provisions and covenants. Debt Guarantees and Covenants The 4.875% Senior Notes are senior unsecured unsubordinated obligations and rank equal in right of payment with existing and future unsubordinated debt, and rank senior in right of payment to existing and future subordinated debt and are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness. See Note 16 - Supplemental Guarantor Condensed Unaudited Consolidating Financial Information. MasTec was in compliance with the provisions and covenants contained in its outstanding debt instruments as of March 31, 2016 and December 31, 2015. Additional Information As of March 31, 2016 and December 31, 2015 , accrued interest payable, which is recorded within other accrued expenses in the consolidated balance sheets, totaled $3.4 million and $7.7 million , respectively. For detailed discussion and additional information pertaining to the Company’s debt instruments, see Note 8 - Debt in the Company’s 2015 Form 10-K.

Lease Obligations

Lease Obligations	3 Months Ended
	Mar. 31, 2016
Leases [Abstract]
Lease Obligations	Note 8 - Lease Obligations Capital Leases MasTec enters into agreements that provide financing for machinery and equipment, which expire on various dates. The gross amount of assets held under capital leases as of March 31, 2016 and December 31, 2015 , which are included within property and equipment, net, in the consolidated balance sheets, totaled $285.0 million and $286.3 million , respectively. Assets held under capital leases, net of accumulated depreciation, totaled $185.6 million and $193.3 million as of March 31, 2016 and December 31, 2015 , respectively. Operating Leases In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facility, vehicle and equipment needs, including related party leases. See Note 15 - Related Party Transactions. Rent expense relating to operating leases that have non-cancelable terms in excess of one year totaled approximately $24.6 million and $20.1 million for the three month periods ended March 31, 2016 and 2015 , respectively. The Company also incurred expenses relating to facilities, vehicles and equipment having original terms of one year or less totaling approximately $46.5 million and $42.8 million for the three month periods ended March 31, 2016 and 2015 , respectively.

Stock-Based Compensation and Ot

Stock-Based Compensation and Other Employee Benefit Plans	3 Months Ended
	Mar. 31, 2016
Share-based Compensation [Abstract]
Stock-Based Compensation and Other Employee Benefit Plans	Note 9 – Stock-Based Compensation and Other Employee Benefit Plans The Company has stock-based compensation plans, under which stock options, restricted stock awards and restricted stock units are reserved for issuance. Under all stock-based compensation plans in effect as of March 31, 2016 , there were approximately 5,363,000 shares available for future grant, including 1,000,000 shares that became available in January 2016. Restricted Shares MasTec grants restricted stock awards and restricted stock units (together “restricted shares”), which are valued based on the closing share price of MasTec common stock on the date of grant. During the restriction period, holders of restricted stock awards are entitled to vote the shares. Total unearned compensation related to restricted shares as of March 31, 2016 was approximately $25.2 million , which is expected to be recognized over a weighted average period of approximately 2.0 years. T he intrinsic value, or fair value, of restricted shares that vested, which is based on the market price on the date of vesting, totaled $0.2 million and $2.6 million for the three month periods ended March 31, 2016 and 2015 , respectively. Activity, restricted shares: (a) Restricted Per Share Weighted Average Grant Date Fair Value Non-vested restricted shares, as of December 31, 2015 1,630,232 $ 22.94 Granted 421,037 12.81 Vested (14,937 ) 13.26 Canceled/forfeited (35,250 ) 24.57 Non-vested restricted shares, as of March 31, 2016 2,001,082 $ 20.85 (a) Includes 48,250 and 32,250 restricted stock units as of March 31, 2016 and December 31, 2015 , respectively. Stock Options The Company has granted options to purchase its common stock to employees and members of the Board of Directors and affiliates under various stock option plans at not less than the fair market value of the underlying stock on the date of grant. All outstanding stock options are fully vested. Activity, stock options: Stock Options Per Share Weighted Average Exercise Price Weighted Average (in years) Aggregate Intrinsic Value (a) (in millions) Options outstanding and exercisable as of December 31, 2015 202,700 $ 13.06 0.55 $ 0.9 Exercised (102,700 ) 13.19 Options outstanding and exercisable as of March 31, 2016 100,000 $ 12.93 0.34 $ 0.7 (a) Amount represents the difference between the exercise price and the closing share price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options. The intrinsic value of options exercised, which is based on the difference between the exercise price and the closing market share price of the Company’s common stock on the date of exercise, totaled $0.7 million and $0.5 million for the three month periods ended March 31, 2016 and 2015 , respectively. Proceeds from options exercised during the three month periods ended March 31, 2016 and 2015 totaled $1.4 million and $0.3 million , respectively. Employee Stock Purchase Plans The Company has certain employee stock purchase plans (collectively “ESPPs”) under which shares of the Company's common stock are available for purchase by eligible employees. The following table provides details pertaining to the Company’s ESPPs for the periods indicated: For the Three Months Ended March 31, 2016 2015 Cash proceeds (in millions) $ 0.6 $ 0.9 Common shares issued 43,172 57,258 Weighted average price per share $ 14.77 $ 16.41 Weighted average per share grant date fair value $ 4.03 $ 4.43 Non-Cash Stock-Based Compensation Expense Details of non-cash stock-based compensation expense and related tax benefits for the periods indicated were as follows (in millions): For the Three Months Ended March 31, 2016 2015 Non-cash stock-based compensation expense $ 3.5 $ 3.6 Income Tax Effects: Income tax benefit from non-cash stock-based compensation $ 1.6 $ 1.4 Excess tax benefit from non-cash stock-based compensation (a) $ 0.2 $ — (a) Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows. There were no excess tax benefits for the three month period ended March 31, 2015 .

Other Retirement Plans

Other Retirement Plans	3 Months Ended
	Mar. 31, 2016
Multiemployer Plans [Abstract]
Other Retirement Plans	Note 10 – Other Retirement Plans Multiemployer Plans. Certain of MasTec’s subsidiaries, including certain subsidiaries in Canada, contribute amounts to multiemployer pension and other multiemployer benefit plans and trusts, which are recorded as a component of employee wages and salaries within costs of revenue, excluding depreciation and amortization. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. Multiemployer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects. Total contributions to multiemployer plans, and the related number of employees covered by these plans, including with respect to the Company’s Canadian operations, for the periods indicated were as follows: Multiemployer Plans Covered Employees Contributions (in millions) Low High Pension Other Multiemployer Total For the Three Months Ended March 31: 2016 1,112 1,409 $ 4.8 $ 2.2 $ 7.0 2015 590 1,124 $ 3.4 $ 2.2 $ 5.6 The average number of employees covered under multiemployer plans increased for the three month period ended March 31, 2016 as compared with the same period in 2015 due primarily to an increase in the Company’s union resource-based projects for its oil and gas operations in the U.S., which resulted in an increase in total multiemployer plan contributions.

Equity

Equity	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Equity	Note 11 – Equity Share Activity In February 2016, the Company’s Board of Directors authorized a $100 million share repurchase program (the “2016 Share Repurchase Program”). Under the 2016 Share Repurchase Program, the Company may repurchase shares from time to time in open market transactions or in privately-negotiated transactions in accordance with applicable securities laws. The timing and the amount of any repurchases will be determined based on market conditions, legal requirements, cash flow and liquidity needs and other factors. The share repurchase program may be modified or suspended at any time, at the Company’s discretion. Share repurchases, which are recorded at cost and are held in the Company’s treasury, will be funded with available cash or with availability under the Credit Facility. As of March 31, 2016 , no shares of the Company’s common stock have been repurchased under this program. Accumulated Other Comprehensive Loss Accumulated other comprehensive losses totaled $74.7 million and $72.4 million as of March 31, 2016 and December 31, 2015 , respectively. For the three month period ended March 31, 2016 unrealized foreign currency translation gains totaled $5.6 million , and for the three month period ended March 31, 2015 , unrealized foreign currency translation losses totaled $22.0 million . Unrealized foreign currency gains and losses relate primarily to fluctuations in foreign currency exchange rates of the Company’s foreign subsidiaries with a functional currency other than the U.S. dollar. Foreign currency activity is related primarily to the Company’s Canadian operations, including expansion of certain of the Company’s organic business operations into Canada. Unrecognized unrealized fair market value losses on interest rate swaps held by the Company’s equity method investments in the Waha JVs totaled $13.0 million , or $8.0 million net of tax, for the three month period ended March 31, 2016 . See Note 4 - Fair Value of Financial Instruments.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Note 12 - Income Taxes In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate based on forecasted annual pre-tax income, permanent tax differences, statutory tax rates and tax planning opportunities in the various jurisdictions in which the Company operates. The effect of significant discrete items is separately recognized in the quarter(s) in which they occur. As of March 31, 2016 , the Company had $13.1 million of current deferred tax assets, net, and $174.4 million of long-term deferred tax liabilities, net. As of December 31, 2015 , current deferred tax assets, net, totaled $19.2 million and long-term deferred tax liabilities, net, totaled $188.8 million .

Segments and Related Informatio

Segments and Related Information	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Segments and Related Information	Note 13 - Segments and Related Information Segment Discussion 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. All five reportable segments derive their revenue from the engineering, installation and maintenance of infrastructure, primarily in North America. The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, distribution infrastructure for electrical utilities, among others. MasTec performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through its Oil and Gas segment. The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations. The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol/biofuel facilities and various types of industrial infrastructure. The Other segment includes a proportionately consolidated non-controlled Canadian joint venture, equity method investments and other small business units that perform construction and other services in a variety of international end-markets. Earnings before interest, taxes, depreciation and amortization (“EBITDA”) is the measure of profitability used by management to manage its segments and, accordingly, in its segment reporting. As appropriate, the Company supplements the reporting of consolidated financial information determined in accordance with U.S. GAAP with certain non-U.S. GAAP financial measures, including EBITDA. The Company believes these non-U.S. GAAP measures provide meaningful information and help investors understand the Company’s financial results and assess its prospects for future performance. The Company uses EBITDA to evaluate its performance, both internally and versus that of its peers, because it excludes certain items that may not be indicative of the Company’s reportable segment results, as well as items that can vary widely across different industries or among companies within the same industry. Segment EBITDA is calculated in a manner consistent with consolidated EBITDA. For the three month period ended March 31, 2016 : (i) Oil and Gas segment EBITDA included project losses of $13.5 million on a western Canadian oil and gas project and $3.4 million of restructuring charges to streamline the operations of its western Canadian oil and gas operations; and (ii) Electrical Transmission segment EBITDA included a project loss of $15.1 million and $0.7 million of restructuring charges to streamline certain of its business operations. For the three month period ended March 31, 2015 : (i) Communications segment EBITDA included $8.8 million of WesTower Communications Inc. (“WesTower”) acquisition integration costs; (ii) Power Generation and Industrial segment EBITDA included $16.0 million of losses on a Canadian wind project; (iii) Other segment EBITDA included $5.5 million of project losses on a proportionately consolidated non-controlled Canadian joint venture; and (iv) Corporate segment EBITDA included $3.0 million of Audit Committee independent investigation related costs resulting from the independent investigation of the Audit Committee that was completed in the fourth quarter of 2015. Restructuring costs, which are included within general and administrative expenses in the condensed unaudited consolidated statements of operations, consisted primarily of employee termination costs and other restructuring-type costs, including lease termination expenses. As of March 31, 2016 , $2.0 million was included within various current liability accounts in the condensed unaudited consolidated balance sheets in connection with these restructuring costs. Summarized financial information for MasTec’s reportable segments is presented and reconciled to consolidated financial information for total MasTec in the following tables (in millions): For the Three Months Ended March 31, Revenue: 2016 2015 Communications (a) $ 511.6 $ 469.9 Oil and Gas 292.7 326.8 Electrical Transmission 86.3 116.0 Power Generation and Industrial 81.4 84.3 Other 3.4 6.6 Eliminations (1.2 ) (0.3 ) Consolidated revenue $ 974.2 $ 1,003.3 (a) Revenue generated primarily by utilities customers represented 10.4% and 8.8% of Communications segment revenue for the three month periods ended March 31, 2016 and 2015 , respectively. For the Three Months Ended March 31, EBITDA: 2016 2015 Communications $ 61.7 $ 51.7 Oil and Gas (a) 16.2 21.5 Electrical Transmission (23.8 ) (2.5 ) Power Generation and Industrial 2.9 (8.9 ) Other (b) 0.2 (5.1 ) Corporate (11.0 ) (13.9 ) Consolidated EBITDA $ 46.2 $ 42.8 (a) Oil and Gas EBITDA includes equity in earnings from unconsolidated affiliates of $3.6 million for the three month period ended March 31, 2016 , and equity in losses from unconsolidated affiliates of $0.6 million for the three month period ended March 31, 2015 . (b) Other EBITDA includes equity in losses from unconsolidated affiliates of $0.5 million for the three month period ended March 31, 2016 . For the Three Months Ended March 31, Depreciation and Amortization: 2016 2015 Communications $ 12.3 $ 12.0 Oil and Gas 18.2 22.0 Electrical Transmission 5.2 5.2 Power Generation and Industrial 1.5 1.6 Other 0.0 0.1 Corporate 1.8 1.7 Consolidated depreciation and amortization $ 39.0 $ 42.6 The following table presents a reconciliation of EBITDA to consolidated loss before income taxes (in millions): For the Three Months Ended March 31, EBITDA Reconciliation: 2016 2015 EBITDA $ 46.2 $ 42.8 Less: Interest expense, net (12.2 ) (11.0 ) Depreciation and amortization (39.0 ) (42.6 ) Loss before income taxes $ (5.0 ) $ (10.7 ) Foreign Operations. MasTec operates in North America, primarily in the United States and Canada, and, to a lesser extent, in Mexico and other international markets. For the three month periods ended March 31, 2016 and 2015 , revenue of $890.7 million and $820.2 million , respectively, was derived from U.S. operations, and revenue of $83.5 million and $183.1 million , respectively, was derived from foreign operations, primarily in Canada. The majority of the Company’s foreign operations during the three month periods ended March 31, 2016 and 2015 were in the Company’s Oil and Gas segment. Long-lived assets held in the U.S. included property and equipment, net, of $453.8 million and $464.6 million as of March 31, 2016 and December 31, 2015 , respectively. Long-lived assets held in foreign countries, primarily in Canada, included property and equipment, net, of $94.2 million and $94.1 million as of March 31, 2016 and December 31, 2015 , respectively. As of both March 31, 2016 and December 31, 2015 intangible assets and goodwill, net, totaled approximately $1.1 billion related to the Company’s U.S. operations. Intangible assets and goodwill, net, of approximately $113.7 million and $107.3 million as of March 31, 2016 and December 31, 2015 , respectively, related to businesses in foreign countries, primarily in Canada. Foreign customers accounted for approximately 13% and 17% of the Company’s consolidated net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings, as of March 31, 2016 and December 31, 2015 , respectively. Significant Customers Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows: For the Three Months Ended March 31, Customer: 2016 2015 AT&T (including DIRECTV ® ) (a)(b) 39% 32% Energy Transfer affiliates (c) 18% 5% (a) The Company’s relationship with AT&T is based upon multiple separate master service agreements, other service agreements and construction/installation contracts for AT&T’s (i) wireless, (ii) wireline/fiber, (iii) home security and automation businesses, and (iv) for DIRECTV® services, is based upon an agreement to provide installation and maintenance services. Revenue from AT&T is included in the Communications segment. (b) DIRECTV® was acquired by AT&T in July 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods. (c) The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., Sunoco Logistics Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 14 - Commitments and Contingencies In addition to the matters discussed below, MasTec is subject to a variety of legal cases, claims and other disputes that arise from time to time in the ordinary course of its business. MasTec cannot provide assurance that it will be successful in recovering all or any of the potential damages it has claimed or in defending claims against the Company. The outcome of such cases, claims and disputes, including those set forth below, cannot be predicted with certainty and an unfavorable resolution of one or more of them could have a material adverse effect on the Company’s business, financial condition, results of operations and cash flows. Wrigley v. MasTec, Inc. In May 2015, a putative class action lawsuit (the “Lawsuit”), Wrigley v. MasTec, Inc., et. al. (Case No. 1:15-cv-21740) was filed in the United States District Court, Southern District of Florida, naming the Company, the Company’s Chief Executive Officer, José R. Mas, and the Company’s Chief Financial Officer, George L. Pita, as defendants. In August 2015, co-lead plaintiffs were appointed, and an amended complaint was filed in October 2015. The Lawsuit has been purportedly brought by a shareholder, both individually and on behalf of a putative class of shareholders, alleging violations of the federal securities laws arising from alleged false or misleading statements contained in, or alleged material omissions from, certain of the Company’s filings with the Securities and Exchange Commission (the “SEC”) and other statements, in each case with respect to accounting matters that are the subject of the Audit Committee’s independent internal investigation. The amended complaint seeks damages stemming from losses Plaintiffs claim to have suffered as a result of purchasing Company securities at an allegedly inflated market price. The Company has filed a motion to dismiss the amended complaint and the District Court has scheduled a two-week trial period beginning in March 2017 pending its ruling on the Company’s motion to dismiss. The Company believes that the Lawsuit is without merit and intends to vigorously defend against it; however, there can be no assurance that the Company will be successful in its defense. Other Commitments and Contingencies Regulatory Matters. As previously disclosed, the Company self-reported to the staff of the SEC (the “Staff”) regarding the previously disclosed Audit Committee’s independent investigation. On December 2, 2015, the Company was notified by the Staff that it had commenced a formal civil investigation relating to the previously disclosed adjustments to the 2014 quarterly condensed unaudited consolidated financial statements and Audit Committee independent investigation. The Company intends to continue full cooperation with the SEC. Leases. In the ordinary course of business, the Company enters into non-cancelable operating leases for certain of its facility, vehicle and equipment needs, including related party leases. See Note 8 - Lease Obligations and Note 15 - Related Party Transactions. Letters of Credit. In the ordinary course of business, the Company is required to post letters of credit for its insurance carriers, surety bond providers and in support of performance under certain contracts as well as certain obligations associated with the Company’s equity method investments. Such letters of credit are generally issued by a bank or similar financial institution. The letter of credit commits the issuer to pay specified amounts to the holder of the letter of credit under certain conditions. If this were to occur, the Company would be required to reimburse the issuer of the letter of credit, which, depending upon the circumstances, could result in a charge to earnings. As of March 31, 2016 and December 31, 2015 , there were $403.8 million and $292.8 million , respectively, of letters of credit issued under the Company’s Credit Facility. The Company is not aware of material claims relating to outstanding letters of credit as of March 31, 2016 or December 31, 2015 . Performance and Payment Bonds. In the ordinary course of business, MasTec is required by certain customers to provide performance and payment bonds for some of the Company’s contractual commitments related to projects in process. These bonds provide a guarantee to the customer that the Company will perform under the terms of a contract and that the Company will pay subcontractors and vendors. If the Company fails to perform under a contract or to pay subcontractors and vendors, the customer may demand that the surety make payments or provide services under the bond. The Company must reimburse the surety for expenses or outlays it incurs. As of March 31, 2016 , the estimated cost to complete projects secured by the Company’s $147.8 million in performance and payment bonds was $21.6 million . As of December 31, 2015 , the estimated cost to complete projects secured by the Company’s $539.3 million in performance and payment bonds was $36.0 million . These amounts do not include performance and payment bonds associated with the Company’s equity method investments and proportionately consolidated non-controlled Canadian joint venture, which are discussed in Note 4 - Fair Value of Financial Instruments and Note 15 - Related Party Transactions. Investments in Affiliates and Other Entities. The Company holds a 35% undivided interest in a proportionately consolidated non-controlled Canadian contractual joint venture, which is managed by a third party, for the purpose of providing infrastructure construction services for a civil construction project. See Note 15 - Related Party Transactions. This joint venture automatically terminates upon completion of the project. Losses incurred by the joint venture are generally shared proportionally by the joint venture members, with members of the joint venture jointly and severally liable for all of the obligations of the joint venture. The joint venture agreement provides that each joint venture partner indemnify the other party for any liabilities incurred by such joint venture in excess of its ratable portion of such liabilities. Thus, it is possible that the Company could be required to pay or perform obligations in excess of its share if the other joint venture partner fails or refuses to pay or perform its share of the obligations. As of March 31, 2016 , the Company was not aware of circumstances that would reasonably lead to future claims against it for material amounts. The Company has other investment arrangements, including equity investments in joint ventures, as discussed in Note 4 - Fair Value of Financial Instruments. From time to time, the Company may provide financing, performance, financial and/or other guarantees to or on behalf of its unconsolidated affiliates, including its equity method investees and/or proportionately consolidated non-controlled Canadian joint venture. Self-Insurance. MasTec maintains insurance policies for workers’ compensation, general liability and automobile liability, which are subject to per claim deductibles. The Company also maintains excess umbrella coverage. As of March 31, 2016 and December 31, 2015 , MasTec’s liability for unpaid claims and associated expenses, including incurred but not reported losses related to these policies, totaled $76.4 million and $76.1 million , respectively, of which $46.6 million and $47.5 million , respectively, were reflected within other long-term liabilities in the consolidated balance sheets. MasTec also maintains an insurance policy with respect to employee group medical claims, which is subject to annual per employee maximum losses. MasTec’s liability for employee group medical claims as of March 31, 2016 and December 31, 2015 totaled $2.0 million and $1.6 million , respectively. The Company is required to post letters of credit and provide cash collateral to certain of its insurance carriers and to provide surety bonds in certain states. Insurance-related letters of credit for the Company’s workers’ compensation, general liability and automobile liability policies amounted to $83.2 million as of both March 31, 2016 and December 31, 2015 . In addition, cash collateral deposited with insurance carriers, which is included within other long-term assets in the consolidated balance sheets, amounted to $1.3 million for these policies as of both March 31, 2016 and December 31, 2015 . Outstanding surety bonds related to workers’ compensation self-insurance programs amounted to $13.4 million as of both March 31, 2016 and December 31, 2015 . Employment Agreements. The Company has employment agreements with certain executives and other employees, which provide for compensation and certain other benefits and for severance payments under certain circumstances. Certain employment agreements also contain clauses that become effective upon a change in control of the Company. Upon the occurrence of any of the defined events in the various employment agreements, the Company would be obligated to pay certain amounts to the relevant employees, which vary with the level of the employees’ respective responsibility. Collective Bargaining Agreements and Multiemployer Plans. As discussed in Note 10 - Other Retirement Plans, certain of MasTec’s subsidiaries are party to various collective bargaining agreements with unions representing certain of their employees. The Employee Retirement Income Security Act of 1974, as amended by the Multiemployer Pension Plan Amendments Act of 1980 (collectively, “ERISA”), which governs U.S.-registered multiemployer pension plans, subjects employers to substantial liabilities in the event of the employer’s complete or partial withdrawal from, or upon termination of, such plans. Under current law pertaining to employers that are contributors to U.S.-registered multiemployer defined benefit plans, a plan’s termination, an employer’s voluntary withdrawal from, or the mass withdrawal of contributing employers from, an underfunded multiemployer defined benefit plan requires participating employers to make payments to the plan for their proportionate share of the multiemployer plan’s unfunded vested liabilities. These liabilities include an allocable share of the unfunded vested benefits of the plan for all plan participants, not only for benefits payable to participants of the contributing employer. As a result, participating employers may bear a higher proportion of liability for unfunded vested benefits if the other participating employers cease to contribute to, or withdraw from, the plan. The allocable portion of liability to participating employers could be more disproportionate if employers that have withdrawn from the plan are insolvent, or if they otherwise fail to pay their proportionate share of the withdrawal liability. The Company currently contributes, and in the past has contributed to, plans that are underfunded, and, therefore, could have potential liability associated with a voluntary or involuntary withdrawal from, or termination of, these plans. Other than the Company’s 2011 withdrawal from Central States Southeast and Southwest Areas Pension Fund (“Central States”), as discussed below, and certain other underfunded plans, also discussed below, the Company does not have plans to withdraw from, and, other than Central States, is not aware of related liabilities associated with these plans. However, there can be no assurance that the Company will not be assessed liabilities in the future. The Pension Protection Act of 2006 requires that underfunded pension plans improve their funding ratios within prescribed intervals based on their level of underfunding, under which benefit reductions may apply and/or participating employers could be required to make additional contributions. In addition, if a multiemployer defined benefit plan fails to satisfy certain minimum funding requirements, the Internal Revenue Service (the “IRS”) may impose on the employers contributing to such plan a non-deductible excise tax of 5% of the amount of the accumulated funding deficiency. Based upon the information available to the Company from plan administrators as of March 31, 2016 , several of the multiemployer pension plans in which it participates are underfunded and, as a result, the Company could be required to increase its contributions, including in the form of a surcharge on future benefit contributions. The amount of additional funds the Company may be obligated to contribute in the future cannot be estimated, as these amounts are based on future levels of work of the union employees covered by these plans, investment returns and the level of underfunding of such plans. In November 2014, the Company, along with other members of the Pipe Line Contractors Association (the “PLCA”), voluntarily terminated its participation in several defined benefit multiemployer pension plans. Additionally, in November 2011, the Company, along with other members of the PLCA, voluntarily withdrew from Central States, for which a $6.4 million withdrawal liability was established as of the date of withdrawal. In the first quarter of 2016, the Company paid $3.0 million , which represented the balance of the recorded withdrawal liability as of December 31, 2015. The Company is in arbitration to determine if there is any remaining liability for interest owed on this withdrawal liability, or whether the amount can be further reduced based on arguments available to the Company. Although the Company does not expect this amount, whether an increase or a decrease, if any, to be material, there can be no assurance as to the final determination. Indemnities. The Company generally indemnifies its customers for the services it provides under its contracts, as well as other specified liabilities, which may subject the Company to indemnity claims, liabilities and related litigation. As of March 31, 2016 and December 31, 2015 , the Company was not aware of material asserted or unasserted claims in connection with these indemnity obligations. Other Guarantees. In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses. MasTec has also issued performance and other guarantees in connection with its undivided interest in a proportionately consolidated non-controlled Canadian joint venture and certain of its equity investees. See Note 4 - Fair Value of Financial Instruments and Note 15 - Related Party Transactions for discussion of certain of the Company’s equity method investees and other investment arrangements, including related guarantees. MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project. Much of the work performed by the Company is evaluated for defects shortly after the work is completed. MasTec has not historically accrued reserves for potential warranty claims as they have not been material. However, if warranty claims occur, the Company could be required to repair or replace warrantied items, or, if customers elect to repair or replace the warrantied item using the services of another provider, the Company could be required to pay for the cost of the repair or replacement. Concentrations of Risk. The Company had approximately 310 customers for the three month period ended March 31, 2016 , and as of March 31, 2016 , one customer accounted for approximately 14% of the Company’s consolidated net accounts receivable position, which represents accounts receivable, net, less billings in excess of costs and earnings. As of December 31, 2015 , a separate customer accounted for approximately 12% of the Company’s consolidated net accounts receivable position. In addition, the Company derived 73% and 60% , respectively, of its revenue from its top ten customers for the three month periods ended March 31, 2016 and 2015 , giving retroactive effect to the acquisition of DIRECTV ® by AT&T.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2016
Related Party Transactions [Abstract]
Related Party Transactions	Note 15 - Related Party Transactions The Company’s 2014 acquisition of Pacer included a 35% undivided interest in a proportionately consolidated non-controlled Canadian contractual joint venture. Pacer’s undivided interest in this contractual joint venture automatically terminates upon completion of the project. Pacer has minimal direct involvement in the remaining work on this project. For the three month periods ended March 31, 2016 and 2015, revenue recognized by Pacer in connection with work performed for this contractual joint venture totaled $0.3 million and $0.6 million , respectively. As of March 31, 2016 and December 31, 2015 , receivables from this contractual joint venture totaled $0.8 million and $1.2 million , respectively. Performance guarantees associated with this contractual joint venture as of both March 31, 2016 and December 31, 2015 totaled Canadian $132.1 million (or approximately $101.6 million and $95.4 million , respectively), based on the full contract value of the project, for which Pacer is obligated on a joint and several basis with its other joint venture partner. In addition, from time to time, the Company may provide financing to this contractual joint venture. There were $3.5 million of such payments made during the three month period ended March 31, 2016 . As of March 31, 2016 , there were no additional amounts committed by Pacer to this contractual joint venture. Subsequent to March 31, 2016, Pacer made a payment of $1.4 million . MasTec purchases, rents and leases equipment used in its business from a number of different vendors on a non-exclusive basis, including Cross Country Pipeline Supply, Inc. (“CCP”), in which the Company has a cost method investment of $15 million . Juan Carlos Mas, who is the brother of Jorge Mas, Chairman of MasTec’s Board of Directors, and José R. Mas, MasTec’s Chief Executive Officer, serves as the chairman of CCP. Additionally, an entity owned by Jorge, José and Juan Carlos Mas is a minority shareholder of CCP. For the three month periods ended March 31, 2016 and 2015 , MasTec paid CCP approximately $0.8 million , net of rebates of approximately $0.4 million , and $1.7 million , respectively, for equipment supplies, rentals, leases and servicing, and as of March 31, 2016 and December 31, 2015 , related payables totaled approximately $0.7 million and $0.6 million , respectively. MasTec entered into a subcontracting arrangement in the first quarter of 2016 for the performance of ancillary services with an entity, the minority owners of which include an entity controlled by Jorge Mas and José R. Mas, along with two members of the management of a subsidiary of the Company. MasTec incurred $1.5 million of expenses under this subcontracting arrangement for the three months ended March 31, 2016 and as of March 31, 2016 , related amounts payable totaled $1.2 million . MasTec leases employees to a customer in which Jorge Mas and José R. Mas own a majority interest. For both the three month periods ended March 31, 2016 and 2015 , MasTec charged approximately $0.2 million to this customer. As of both March 31, 2016 and December 31, 2015 , outstanding receivables from employee leasing arrangements with this customer totaled $0.1 million . The Company also provides satellite communication services to this customer. For both the three month periods ended March 31, 2016 and 2015 , revenue from satellite communication services provided to this customer totaled approximately $0.2 million , and as of March 31, 2016 and December 31, 2015 , receivables totaled approximately $0.4 million and $0.3 million , respectively. The Company entered into a leasing arrangement in 2015 with a third party that leases an aircraft from a Company owned by Jorge Mas. The Company paid $0.7 million under this leasing arrangement for the three month period ended March 31, 2016 . There were no payments under this leasing arrangement for the three month period ended March 31, 2015 . Certain of the Company’s subsidiaries have entered into related party lease arrangements for operational facilities and equipment, typically with the former owners of acquired businesses. Related party lease payments for the three month periods ended March 31, 2016 and 2015 totaled approximately $9.1 million and $5.3 million , respectively, and as of March 31, 2016 and December 31, 2015 , payables totaled approximately $0.8 million and $0.1 million , respectively. In addition, certain subsidiaries have entered into related party arrangements for various types of supplies and services, including project-related site restoration and marketing and business development activities, for which the Company paid approximately $3.1 million and $0.9 million for the three month periods ended March 31, 2016 and 2015 , respectively, and as of March 31, 2016 and December 31, 2015 , payables totaled approximately $1.0 million and $2.1 million , respectively. Split Dollar Agreements MasTec has split dollar agreements with each of José R. Mas and Jorge Mas. No payments were made in connection with these agreements in either of the three month periods ended March 31, 2016 or 2015 . As of both March 31, 2016 and December 31, 2015 , life insurance assets associated with these agreements totaled $13.0 million , and were included within other long-term assets in the consolidated balance sheets.

Supplemental Guarantor Financia

Supplemental Guarantor Financial Information	3 Months Ended
	Mar. 31, 2016
Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract]
Supplemental Guarantor Financial Information	Note 16 – Supplemental Guarantor Condensed Unaudited Consolidating Financial Information The 4.875% Senior Notes are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness (the “Guarantor Subsidiaries”) The Company’s subsidiaries organized outside of the United States and certain domestic subsidiaries (collectively, the “Non-Guarantor Subsidiaries”) do not guarantee any of these notes. A Guarantor Subsidiary’s guarantee is subject to release in certain customary circumstances, including: upon the sale of a majority of the capital stock or substantially all of the assets of such Guarantor Subsidiary; if the Guarantor Subsidiary’s guarantee under the Company’s Credit Facility and other indebtedness is released or discharged (other than due to payment under such guarantee); or when the requirements for legal defeasance are satisfied or the obligations are discharged in accordance with the related indentures. The following supplemental financial information sets forth the condensed unaudited consolidating balance sheets and the condensed unaudited consolidating statements of operations and comprehensive income (loss) and cash flows for MasTec, Inc., the Guarantor Subsidiaries on a combined basis, the Non-Guarantor Subsidiaries on a combined basis and the eliminations necessary to arrive at the information for the Company as reported on a consolidated basis. Eliminations represent adjustments to eliminate investments in subsidiaries and intercompany balances and transactions between or among MasTec, Inc., the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries. Investments in subsidiaries are accounted for using the equity method for this presentation. CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (in millions) For the Three Months Ended March 31, 2016 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Revenue $ — $ 878.1 $ 96.1 $ — $ 974.2 Costs of revenue, excluding depreciation and amortization — 777.2 107.2 — 884.4 Depreciation and amortization — 31.3 7.7 — 39.0 General and administrative expenses 0.6 50.0 9.4 — 60.0 Interest expense (income), net — 27.4 (15.2 ) — 12.2 Equity in earnings of unconsolidated affiliates — — (3.1 ) — (3.1 ) Other income, net — (11.3 ) (2.1 ) — (13.4 ) Loss (income) before income taxes $ (0.6 ) $ 3.4 $ (7.8 ) $ — $ (5.0 ) Benefit from (provision for) income taxes 0.2 (1.3 ) 3.2 — 2.1 Net loss (income) before equity in losses from subsidiaries $ (0.4 ) $ 2.1 $ (4.6 ) $ — $ (2.9 ) Equity in losses from subsidiaries, net of tax (2.3 ) — — 2.3 — Net (loss) income $ (2.7 ) $ 2.1 $ (4.6 ) $ 2.3 $ (2.9 ) Net loss attributable to non-controlling interests — — (0.2 ) — (0.2 ) Net (loss) income attributable to MasTec, Inc. $ (2.7 ) $ 2.1 $ (4.4 ) $ 2.3 $ (2.7 ) Comprehensive (loss) income $ (5.1 ) $ 2.1 $ (7.0 ) $ 4.7 $ (5.3 ) For the Three Months Ended March 31, 2015 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Revenue $ — $ 803.0 $ 201.7 $ (1.4 ) $ 1,003.3 Costs of revenue, excluding depreciation and amortization — 682.7 205.1 (1.4 ) 886.4 Depreciation and amortization — 32.3 10.3 — 42.6 General and administrative expenses 0.6 66.2 7.2 — 74.0 Interest expense (income), net — 27.1 (16.1 ) — 11.0 Equity in losses of unconsolidated affiliates — — 0.6 — 0.6 Other (income) expense, net — (0.9 ) 0.3 — (0.6 ) Loss before income taxes $ (0.6 ) $ (4.4 ) $ (5.7 ) $ — $ (10.7 ) Benefit from income taxes 0.2 1.7 2.4 — 4.4 Net loss before equity in losses from subsidiaries $ (0.4 ) $ (2.7 ) $ (3.3 ) $ — $ (6.4 ) Equity in losses from subsidiaries, net of tax (5.9 ) — — 5.9 — Net (loss) income $ (6.3 ) $ (2.7 ) $ (3.3 ) $ 5.9 $ (6.4 ) Net loss attributable to non-controlling interests — — (0.1 ) — (0.1 ) Net (loss) income attributable to MasTec, Inc. $ (6.3 ) $ (2.7 ) $ (3.2 ) $ 5.9 $ (6.3 ) Comprehensive (loss) income $ (28.3 ) $ (2.7 ) $ (25.4 ) $ 28.0 $ (28.4 ) CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions) As of March 31, 2016 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Assets Current assets $ — $ 1,017.8 $ 180.7 $ — $ 1,198.5 Property and equipment, net — 437.9 110.0 — 548.0 Goodwill and other intangible assets, net — 1,043.4 146.1 — 1,189.5 Investments in and advances to consolidated affiliates, net 931.0 78.9 76.0 (1,085.9 ) — Other long-term assets 9.3 19.6 21.8 — 50.7 Total assets $ 940.3 $ 2,597.6 $ 534.6 $ (1,085.9 ) $ 2,986.6 Liabilities and equity Total current liabilities $ — $ 679.0 $ 132.7 $ — $ 811.7 Long-term debt — 909.3 29.4 — 938.7 Other long-term liabilities — 257.4 34.9 — 292.3 Total liabilities $ — $ 1,845.7 $ 197.0 $ — $ 2,042.8 Total equity $ 940.3 $ 751.9 $ 337.6 $ (1,085.9 ) $ 943.9 Total liabilities and equity $ 940.3 $ 2,597.6 $ 534.6 $ (1,085.9 ) $ 2,986.6 As of December 31, 2015 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Assets Current assets $ — $ 927.4 $ 202.4 $ — $ 1,129.8 Property and equipment, net — 448.2 110.5 — 558.7 Goodwill and other intangible assets, net — 1,047.4 140.5 — 1,187.9 Investments in and advances to consolidated affiliates, net 930.3 103.7 50.6 (1,084.6 ) — Other long-term assets 9.3 24.4 17.3 — 51.0 Total assets $ 939.6 $ 2,551.1 $ 521.3 $ (1,084.6 ) $ 2,927.3 Liabilities and equity Total current liabilities $ — $ 632.9 $ 119.6 $ — $ 752.5 Long-term debt — 900.1 32.8 — 932.9 Other long-term liabilities — 275.5 23.0 — 298.5 Total liabilities $ — $ 1,808.5 $ 175.4 $ — $ 1,984.0 Total equity $ 939.6 $ 742.5 $ 345.9 $ (1,084.6 ) $ 943.4 Total liabilities and equity $ 939.6 $ 2,551.0 $ 521.3 $ (1,084.6 ) $ 2,927.3 CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions) For the Three Months Ended March 31, 2016 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Net cash (used in) provided by operating activities $ — $ (5.3 ) $ 21.2 $ — $ 15.9 Cash flows (used in) provided by investing activities: Capital expenditures — (12.2 ) (1.1 ) — (13.3 ) Proceeds from sale of property and equipment — 1.5 0.7 — 2.2 Payments for other investments — — (1.5 ) — (1.5 ) Net cash used in investing activities $ — $ (10.7 ) $ (1.9 ) $ — $ (12.6 ) Cash flows provided by (used in) financing activities: Proceeds from credit facilities — 286.8 48.9 — 335.7 Repayments of credit facilities — (270.5 ) (50.2 ) — (320.7 ) Repayments of other borrowings and capital lease obligations — (16.3 ) (4.3 ) — (20.6 ) Proceeds from stock-based awards, net of tax withholdings 2.0 (0.2 ) — — 1.8 Excess tax benefit from stock-based compensation — 0.2 — — 0.2 Net financing activities and advances from (to) consolidated affiliates (2.0 ) 13.6 (11.6 ) — — Net cash provided by (used in) financing activities $ — $ 13.6 $ (17.2 ) $ — $ (3.6 ) Effect of currency translation on cash — — (0.7 ) — (0.7 ) Net (decrease) increase in cash and cash equivalents $ — $ (2.5 ) $ 1.4 $ — $ (1.1 ) Cash and cash equivalents - beginning of period — 4.7 0.3 — 5.0 Cash and cash equivalents - end of period $ — $ 2.2 $ 1.7 $ — $ 3.9 For the Three Months Ended March 31, 2015 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Net cash (used in) provided by operating activities $ (0.4 ) $ 175.9 $ (56.7 ) $ — $ 118.8 Cash flows (used in) provided by investing activities: Cash paid for acquisitions, net of cash acquired — (0.1 ) — — (0.1 ) Capital expenditures — (17.9 ) (1.8 ) — (19.7 ) Proceeds from sale of property and equipment — 1.2 0.2 — 1.4 Payments for other investments $ — $ (32.0 ) $ — $ — $ (32.0 ) Net cash used in investing activities $ — $ (48.8 ) $ (1.6 ) $ — $ (50.4 ) Cash flows provided by (used in) financing activities: Proceeds from credit facilities $ — $ 251.0 $ 188.5 $ — $ 439.5 Repayments of credit facilities — (224.7 ) (180.1 ) — (404.8 ) Repayments of other borrowings and capital lease obligations — (10.7 ) (4.4 ) — (15.1 ) Repurchase of common stock (83.3 ) — — — (83.3 ) Proceeds from stock-based awards, net of tax withholdings 1.1 (0.2 ) — — 0.9 Net financing activities and advances from (to) consolidated affiliates 82.6 (135.7 ) 53.1 — — Net cash provided by (used in) financing activities $ 0.4 $ (120.3 ) $ 57.1 $ — $ (62.8 ) Effect of currency translation on cash — — (1.0 ) — (1.0 ) Net increase (decrease) in cash and cash equivalents $ — $ 6.8 $ (2.2 ) $ — $ 4.6 Cash and cash equivalents - beginning of period — 18.5 5.6 — 24.1 Cash and cash equivalents - end of period $ — $ 25.3 $ 3.4 $ — $ 28.7

Business, Basis of Presentati23

Business, Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions for Form 10-Q and Rule 10-01 of Regulation S-X. Pursuant to these rules and regulations, certain information and footnote disclosures normally included in the annual audited consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The accompanying condensed consolidated balance sheet as of December 31, 2015 is derived from the Company’s audited financial statements as of that date. Because certain information and footnote disclosures have been condensed or omitted, these condensed unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto as of and for the year ended December 31, 2015 contained in the Company’s 2015 Annual Report on Form 10-K (the “ 2015 Form 10-K”). In management’s opinion, all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. Certain prior year amounts have been reclassified to conform to the current period presentation. Interim period operating results do not necessarily indicate the results that may be expected for any other interim period or for the full fiscal year. The Company believes that the disclosures made in these condensed unaudited consolidated financial statements are adequate to make the information not misleading.
Reclassifications	Certain prior year amounts have been reclassified to conform to the current period presentation.
Principles of Consolidation	Principles of Consolidation The accompanying condensed unaudited consolidated financial statements include MasTec, Inc. and its subsidiaries and include the accounts of all majority owned subsidiaries over which the Company exercises control and, when applicable, entities in which the Company has a controlling financial interest. Other parties’ interests in companies for which MasTec exercises control and has a controlling financial interest are reported as non-controlling interests within equity. Net income or loss attributable to non-controlling interests is reported as a separate line item below net income or loss. The Company’s investments in entities in which the Company does not have a controlling interest, but for which it has the ability to exert significant influence, are accounted for using the equity method of accounting. Equity method investments are recorded as other long-term assets or, for investments in a net liability position, within other long-term liabilities in the condensed unaudited consolidated balance sheets. Income or loss from these investments is recorded as a separate line item in the condensed unaudited consolidated statements of operations. Intercompany profits or losses associated with the Company’s equity method investments are eliminated until realized by the investee. The cost method is used for investments in entities in which the Company does not have the ability to exert significant influence. All significant intercompany balances and transactions have been eliminated in consolidation. The assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange during the applicable period. Substantially all of the Company’s foreign operations use the local currency as the functional currency. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have subsidiaries that operate in highly inflationary environments.
Translation of Foreign Currencies	The assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at period-end exchange rates, with resulting translation gains or losses accumulated within other comprehensive income or loss. Revenue and expenses are translated into U.S. dollars at average rates of exchange during the applicable period. Substantially all of the Company’s foreign operations use the local currency as the functional currency. Gains or losses resulting from transactions executed in a foreign currency are included in other income or expense, net. The Company does not currently have subsidiaries that operate in highly inflationary environments.
Investments in Affiliates and Other Entities	Investments in Affiliates and Other Entities In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may include financing arrangements, such as the extension of loans. See Note 4 - Fair Value of Financial Instruments and Note 15 - Related Party Transactions for discussion pertaining to certain of the Company’s cost and equity method investments and other investment arrangements. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the primary activities of the VIE and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest. As of March 31, 2016 , the Company determined that certain of its investment arrangements were VIEs, but that it was not the primary beneficiary. In arrangements in which the Company has an undivided interest in the assets, liabilities, revenues and profits or losses of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity.
Variable Interest Entities	In the ordinary course of business, the Company enters into various investment arrangements, which may include equity or other interests in business entities, including contractual joint ventures or other forms of equity participation. These investment arrangements may include financing arrangements, such as the extension of loans. See Note 4 - Fair Value of Financial Instruments and Note 15 - Related Party Transactions for discussion pertaining to certain of the Company’s cost and equity method investments and other investment arrangements. In connection with certain of these investment arrangements, the Company provides infrastructure construction services to or through its equity investees and/or contractual joint ventures. Management determines whether such investment arrangements involve a variable interest entity (“VIE”) based on the characteristics of the particular entity. If an entity is determined to be a VIE, then management determines if the Company is the primary beneficiary of the entity and whether or not consolidation of the VIE within the Company's financial statements is required. The primary beneficiary consolidating the VIE must normally have both (i) the power to direct the primary activities of the VIE and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE, which, in either case, could be significant to the VIE. If management determines that the Company is the primary beneficiary of a VIE, then the VIE would be consolidated, and the other party’s equity interest in the VIE would be accounted for as a non-controlling interest.
Unincorporated Joint Ventures, Proportionate Consolidation	In arrangements in which the Company has an undivided interest in the assets, liabilities, revenues and profits or losses of an unincorporated entity, such amounts are consolidated on a basis proportional to the Company’s ownership interest in the unincorporated entity.
Management Estimates	Management Estimates The preparation of financial statements in conformity with U.S. GAAP requires the use of estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. 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 depreciation), in particular, on long-term construction contracts, or other projects accounted for under the percentage-of-completion method, for which the recorded amounts require estimates of costs to complete projects, ultimate project profit and the amount of contract price adjustments that are probable; allowances for doubtful accounts; estimated fair values of goodwill and intangible assets and liabilities, acquisition-related contingent consideration and investments in cost and equity method investees; asset lives used in computing depreciation and amortization; accrued self-insured claims; share-based compensation; accounting for income taxes; and the estimated impact of contingencies and ongoing litigation. 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 from those estimates and such differences could be material to the condensed unaudited consolidated financial statements.
Revenue Recognition	Revenue Recognition Revenue is derived from projects performed under master and other service agreements as well as from fixed price contracts for specific projects or jobs requiring the construction and installation of an entire infrastructure system or specified units within an entire infrastructure system. The Company frequently provides maintenance, installation and repair work under unit price or fixed price master service or other service agreements that are renewed on a periodic basis. Revenue and related costs for master and other service agreements billed on a time and materials basis are recognized as the services are rendered. Revenue derived from projects performed under master service and other service agreements totaled 50% and 52% of revenue for the three month periods ended March 31, 2016 and 2015 , respectively. The Company also performs services under master and other service agreements on a fixed fee basis, under which MasTec furnishes specified units of service for a fixed price per unit of service and revenue is recognized as the services are rendered. 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 (excluding certain depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenue and costs. 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 final contract settlements are factors that influence management’s assessment of total contract value and total estimated 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. Excluding the effects of project losses of: $13.5 million on a western Canadian oil and gas project and $15.1 million on an Electrical Transmission project for the three month period ended March 31, 2016 , and project losses of $16.0 million on a Canadian wind project and $5.5 million on a proportionately consolidated non-controlled Canadian joint venture for the three month period ended March 31, 2015, project profit was affected by less than 5% for the three month periods ended March 31, 2016 and 2015 as a result of changes in contract estimates included in projects that were in process as of December 31, 2015 and 2014, 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 one year. 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 project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/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 March 31, 2016 and December 31, 2015 , the Company had approximately $20 million and $38 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 or will be earned and that management believes is probable of collection. As of March 31, 2016 , these change orders were primarily related to contracts in the Oil and Gas segment, and as of December 31, 2015 , the Oil and Gas and Electrical Transmission segments. The Company actively engages in substantive meetings with its customers to complete the final approval process, and generally expects these processes to be completed within one year. The amounts ultimately realized upon final acceptance by its customers could be higher or lower than such estimated amounts. Billings in excess of costs and estimated earnings on uncompleted contracts are classified as current liabilities. Costs and estimated earnings in excess of billings, or work in process, is classified within current assets for the majority of the Company’s projects. Work in process on contracts is based on work performed but not yet billed to customers as per individual contract terms.
Revenue Recognition, Percentage-of-Completion Method	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 (excluding certain depreciation). Much of the materials associated with the Company’s work are customer-furnished and are therefore not included in contract revenue and costs. 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 final contract settlements are factors that influence management’s assessment of total contract value and total estimated 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. Excluding the effects of project losses of: $13.5 million on a western Canadian oil and gas project and $15.1 million on an Electrical Transmission project for the three month period ended March 31, 2016 , and project losses of $16.0 million on a Canadian wind project and $5.5 million on a proportionately consolidated non-controlled Canadian joint venture for the three month period ended March 31, 2015, project profit was affected by less than 5% for the three month periods ended March 31, 2016 and 2015 as a result of changes in contract estimates included in projects that were in process as of December 31, 2015 and 2014, 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 one year.
New Accounting Pronouncements	Recently Issued Accounting Pronouncements There have been no changes in the expected dates of adoption or estimated effects on the Company’s consolidated financial statements of recently issued accounting pronouncements from those disclosed in the Company’s 2015 Form 10-K. Recently Issued Accounting Pronouncements Not Yet Adopted In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). ASU 2016-09 is intended to improve and simplify the accounting for share-based payment transactions. Under ASU 2016-09, when share-based payment awards vest or are settled, excess tax benefits (“windfalls”) or tax deficiencies (“shortfalls”) are to be recognized in the income statement, rather than as additional paid-in-capital, and these tax effects will be presented within the statement of cash flows as an operating cash flow, rather than as a financing activity. The recognition of the income tax effects of share-based payment awards in the income statement will also affect the computation of dilutive common stock equivalents as calculated under the treasury stock method, as windfalls will no longer be included in assumed proceeds from outstanding awards. ASU 2016-09 increases the amount an employer can withhold to cover statutory employee tax withholdings, and requires that payments to taxing authorities for such employee withholdings be presented as a financing activity. ASU 2016-09 also provides for an accounting policy election for forfeitures, whereby forfeitures can either be estimated or accounted for as incurred. ASU 2016-09 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted if all provisions of the standard are early adopted. The Company is currently evaluating the expected adoption method and potential effect of this ASU on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) (“ASU 2016-08”), in April 2016 issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing (“ASU 2016-10”), and in May 2016, issued ASU 2016-11, Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-16 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting (“ASU 2016-11”) . ASU 2016-08 clarifies principal versus agent considerations relating to when another party, along with the entity, is involved in providing a good or service to a customer. ASU 2016-08 requires an entity to determine whether the nature of its promise is to provide a good or service to a customer, or to arrange for the good or service to be provided to the customer by the other party. This determination is based upon whether the entity controls the good or service before it is transferred to the customer. When the entity that satisfies a performance obligation is the principal, the entity recognizes the gross amount of consideration as revenue. When the entity that satisfies the performance obligation is the agent, it recognizes the amount of any fee or commission as revenue. ASU 2016-10 clarifies the guidance in Topic 606 for identifying performance obligations in a contract as well as the implementation guidance pertaining to revenue recognition related to licensing arrangements. ASU 2016-11 rescinds several SEC Staff Announcements that are codified in Topic 605, including, among other items, guidance relating to accounting for consideration given by a vendor to a customer, as well as accounting for shipping and handling fees and freight services. The effective date and transition requirements for the amendments in ASU 2016-08 and ASU 2016-10 are the same as the effective date and transition requirements of ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which is effective for fiscal years, and for interim periods within those years, beginning after December 15, 2017. The Company is evaluating the potential effect of these ASUs on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, Investments-Equity Method and Joint Ventures (Topic 323: Simplifying the Transition to the Equity Method of Accounting (“ASU 2016-07”). ASU 2016-07 eliminates the requirement that an investor retrospectively apply the equity method of accounting when an investment becomes qualified for the equity method of accounting as a result of an increase in the level of ownership or degree of influence. ASU 2016-07 requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. ASU 2016-07 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016, on a prospective basis. Early adoption is permitted. The Company does not expect that this ASU will have a material effect on its consolidated financial statements. In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments (a consensus of the FASB Emerging Issues Task Force) (“ASU 2016-06”) and ASU 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships (a consensus of the FASB Emerging Issues Task Force) (“ASU 2016-05”). ASU 2016-06 clarifies the requirements for assessing whether contingent call or put options that can accelerate repayment are clearly and closely related to the economic characteristics and risk of the lost contract. When a call or put option is contingently exercisable, an entity does not have to assess whether the event that triggers the ability to exercise the option is related to interest rates or credit risk. An entity is only required to assess the embedded call or put option in accordance with the four-step decision sequence under current GAAP. ASU 2016-06 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016, on a modified retrospective basis. Early adoption is permitted. ASU 2016-05 clarifies that a change in the counterparty to a derivative instrument is not, in and of itself, considered to be a termination of the original derivative instrument, which would discontinue the application of hedge accounting, provided that all other hedge accounting criteria continue to be met. ASU 2016-05 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. ASU 2016-05 is effective either prospectively or on a modified retrospective basis. The Company does not expect these ASUs to have an effect on the Company’s consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Subtopic 842) (“ASU 2016-02”). ASU 2016-02 provides revised guidance for lease accounting and related disclosure requirements, including a requirement for lessees to recognize lease assets and lease liabilities for operating leases with a duration of greater than one year. Under the previous guidance, lessees were not required to recognize assets and liabilities for operating leases on the balance sheet. ASU 2016-02 is effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. Modified retrospective application is required for all relevant prior periods. The Company is currently evaluating the potential impact of this ASU on its consolidated financial statements. Upon adoption, the Company expects to recognize lease assets and liabilities for certain of its operating leases on the Company’s consolidated balance sheets. Recently Issued Accounting Pronouncements Adopted as of January 1, 2016 In April 2015, the FASB issued ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03” ), which requires that debt issuance costs related to a recognized debt liability be presented as a direct deduction from the carrying amount of the debt. The adoption of ASU 2015-03 resulted in the reclassification of $12.9 million of deferred financing costs associated with the Company’s credit facility and senior notes from other current and other long-term assets to current and long-term debt as of December 31, 2015, which amount was composed of approximately $5.5 million , $1.0 million and $6.4 million related to the Company’s credit facility, term loan and 4.875% senior notes, respectively. See Note 7 - Debt.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Information	The following table provides details underlying the Company’s earnings per share calculations for the periods indicated (in thousands): For the Three Months Ended March 31, 2016 2015 Net loss attributable to MasTec: Net loss - basic and diluted (a) $ (2,692 ) $ (6,263 ) Weighted average shares outstanding: Weighted average shares outstanding - basic 80,156 82,397 Dilutive common stock equivalents — — Weighted average shares outstanding - diluted 80,156 82,397 (a) Calculated as total net loss less amounts attributable to non-controlling interests.

Goodwill and Other Intangible25

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill by Segment	The following table provides details of goodwill by reportable segment (in millions): Communications Oil and Gas Electrical Transmission Power Generation and Industrial Total Goodwill Goodwill, gross carrying amount $ 414.9 $ 381.8 $ 149.9 $ 117.6 $ 1,064.2 Accumulated impairment losses — (72.2 ) — — (72.2 ) Goodwill, net, as of March 31, 2016 $ 414.9 $ 309.6 $ 149.9 $ 117.6 $ 992.0
Rollforward of Other Intangible Assets	The following table provides a reconciliation of changes in other intangible assets for the period indicated (in millions): Other Intangible Assets Non-amortizing Amortizing Trade Names Pre-Qualifications Customer Relationships and Backlog Other (a) Total Other intangible assets, gross carrying amount as of December 31, 2015 $ 34.8 $ 73.4 $ 195.4 $ 25.7 $ 329.3 Accumulated amortization (114.6 ) (15.3 ) (129.9 ) Other intangible assets, net, as of December 31, 2015 $ 34.8 $ 73.4 $ 80.8 $ 10.4 $ 199.4 Amortization expense (4.2 ) (1.1 ) (5.3 ) Currency translation adjustments — 2.7 0.6 0.1 3.4 Other intangible assets, net, as of March 31, 2016 $ 34.8 $ 76.1 $ 77.2 $ 9.4 $ 197.5 (a) Consists principally of trade names and non-compete agreements.

Accounts Receivable, Net of A26

Accounts Receivable, Net of Allowance (Tables)	3 Months Ended
	Mar. 31, 2016
Accounts Receivable [Member]
Schedule of Accounts Receivable, Net of Allowance [Line Items]
Schedule of Accounts Receivable, Net of Allowance	The following table provides details of accounts receivable, net of allowance, as of the dates indicated (in millions): March 31, December 31, Contract billings $ 478.9 $ 437.3 Retainage 145.5 148.8 Costs and earnings in excess of billings 354.0 332.7 Accounts receivable, gross $ 978.4 $ 918.8 Less allowance for doubtful accounts (7.5 ) (7.7 ) Accounts receivable, net $ 970.9 $ 911.1

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	3 Months Ended
	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment, Net	The following table provides details of property and equipment, net, including property and equipment held under capital leases as of the dates indicated (in millions): March 31, December 31, Land $ 4.6 $ 4.6 Buildings and leasehold improvements 21.9 21.7 Machinery and equipment 923.4 912.9 Office furniture and equipment 140.3 136.9 Construction in progress 13.7 10.8 Total property and equipment $ 1,103.9 $ 1,086.9 Less accumulated depreciation and amortization (555.9 ) (528.2 ) Property and equipment, net $ 548.0 $ 558.7

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Schedule of Carrying Values of Debt	The following table provides details of the carrying values of debt as of the dates indicated (in millions): Description Maturity Date March 31, December 31, Senior secured credit facility: Revolving loans October 29, 2018 $ 230.9 $ 208.5 Term loan November 21, 2019 246.9 250.0 4.875% Senior Notes March 15, 2023 400.0 400.0 Other credit facilities Varies 14.9 16.4 Capital lease obligations, weighted average interest rate of 2.8% In installments through June 13, 2021 117.9 130.9 Notes payable, equipment, weighted average interest rate of 2.8% In installments through May 31, 2018 14.2 17.4 Total debt $ 1,024.8 $ 1,023.2 Less unamortized deferred financing costs (12.0 ) (12.9 ) Less current maturities (74.1 ) (77.4 ) Long-term debt $ 938.7 $ 932.9

Stock-Based Compensation and 29

Stock-Based Compensation and Other Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2016
Share-based Compensation [Abstract]
Schedule of Activity, Restricted Shares	Activity, restricted shares: (a) Restricted Per Share Weighted Average Grant Date Fair Value Non-vested restricted shares, as of December 31, 2015 1,630,232 $ 22.94 Granted 421,037 12.81 Vested (14,937 ) 13.26 Canceled/forfeited (35,250 ) 24.57 Non-vested restricted shares, as of March 31, 2016 2,001,082 $ 20.85 (a) Includes 48,250 and 32,250 restricted stock units as of March 31, 2016 and December 31, 2015 , respectively.
Schedule of Activity, Stock Options	Activity, stock options: Stock Options Per Share Weighted Average Exercise Price Weighted Average (in years) Aggregate Intrinsic Value (a) (in millions) Options outstanding and exercisable as of December 31, 2015 202,700 $ 13.06 0.55 $ 0.9 Exercised (102,700 ) 13.19 Options outstanding and exercisable as of March 31, 2016 100,000 $ 12.93 0.34 $ 0.7 (a) Amount represents the difference between the exercise price and the closing share price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.
Schedule of Activity, Employee Stock Purchase Plans	The following table provides details pertaining to the Company’s ESPPs for the periods indicated: For the Three Months Ended March 31, 2016 2015 Cash proceeds (in millions) $ 0.6 $ 0.9 Common shares issued 43,172 57,258 Weighted average price per share $ 14.77 $ 16.41 Weighted average per share grant date fair value $ 4.03 $ 4.43
Schedule of Non-Cash Stock-Based Compensation Expense and Related Tax Benefits	Details of non-cash stock-based compensation expense and related tax benefits for the periods indicated were as follows (in millions): For the Three Months Ended March 31, 2016 2015 Non-cash stock-based compensation expense $ 3.5 $ 3.6 Income Tax Effects: Income tax benefit from non-cash stock-based compensation $ 1.6 $ 1.4 Excess tax benefit from non-cash stock-based compensation (a) $ 0.2 $ — (a) Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows. There were no excess tax benefits for the three month period ended March 31, 2015 .

Other Retirement Plans (Tables)

Other Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2016
Multiemployer Plans [Abstract]
Schedule of Covered Employees and Contributions, Multiemployer Plans	Total contributions to multiemployer plans, and the related number of employees covered by these plans, including with respect to the Company’s Canadian operations, for the periods indicated were as follows: Multiemployer Plans Covered Employees Contributions (in millions) Low High Pension Other Multiemployer Total For the Three Months Ended March 31: 2016 1,112 1,409 $ 4.8 $ 2.2 $ 7.0 2015 590 1,124 $ 3.4 $ 2.2 $ 5.6

Segments and Related Informat31

Segments and Related Information (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Schedule of Financial Information by Reportable Segment	Summarized financial information for MasTec’s reportable segments is presented and reconciled to consolidated financial information for total MasTec in the following tables (in millions): For the Three Months Ended March 31, Revenue: 2016 2015 Communications (a) $ 511.6 $ 469.9 Oil and Gas 292.7 326.8 Electrical Transmission 86.3 116.0 Power Generation and Industrial 81.4 84.3 Other 3.4 6.6 Eliminations (1.2 ) (0.3 ) Consolidated revenue $ 974.2 $ 1,003.3 (a) Revenue generated primarily by utilities customers represented 10.4% and 8.8% of Communications segment revenue for the three month periods ended March 31, 2016 and 2015 , respectively. For the Three Months Ended March 31, EBITDA: 2016 2015 Communications $ 61.7 $ 51.7 Oil and Gas (a) 16.2 21.5 Electrical Transmission (23.8 ) (2.5 ) Power Generation and Industrial 2.9 (8.9 ) Other (b) 0.2 (5.1 ) Corporate (11.0 ) (13.9 ) Consolidated EBITDA $ 46.2 $ 42.8 (a) Oil and Gas EBITDA includes equity in earnings from unconsolidated affiliates of $3.6 million for the three month period ended March 31, 2016 , and equity in losses from unconsolidated affiliates of $0.6 million for the three month period ended March 31, 2015 . (b) Other EBITDA includes equity in losses from unconsolidated affiliates of $0.5 million for the three month period ended March 31, 2016 . For the Three Months Ended March 31, Depreciation and Amortization: 2016 2015 Communications $ 12.3 $ 12.0 Oil and Gas 18.2 22.0 Electrical Transmission 5.2 5.2 Power Generation and Industrial 1.5 1.6 Other 0.0 0.1 Corporate 1.8 1.7 Consolidated depreciation and amortization $ 39.0 $ 42.6
Reconciliation of EBITDA to Consolidated Loss before Income Taxes	The following table presents a reconciliation of EBITDA to consolidated loss before income taxes (in millions): For the Three Months Ended March 31, EBITDA Reconciliation: 2016 2015 EBITDA $ 46.2 $ 42.8 Less: Interest expense, net (12.2 ) (11.0 ) Depreciation and amortization (39.0 ) (42.6 ) Loss before income taxes $ (5.0 ) $ (10.7 )
Schedule of Significant Customers, Revenue Concentration Information	Revenue concentration information for significant customers as a percentage of total consolidated revenue was as follows: For the Three Months Ended March 31, Customer: 2016 2015 AT&T (including DIRECTV ® ) (a)(b) 39% 32% Energy Transfer affiliates (c) 18% 5% (a) The Company’s relationship with AT&T is based upon multiple separate master service agreements, other service agreements and construction/installation contracts for AT&T’s (i) wireless, (ii) wireline/fiber, (iii) home security and automation businesses, and (iv) for DIRECTV® services, is based upon an agreement to provide installation and maintenance services. Revenue from AT&T is included in the Communications segment. (b) DIRECTV® was acquired by AT&T in July 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods. (c) The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., Sunoco Logistics Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.

Supplemental Guarantor Financ32

Supplemental Guarantor Financial Information (Tables)	3 Months Ended
	Mar. 31, 2016
Condensed Unaudited Financial Statements, Supplemental Guarantor Information [Abstract]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss)	CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (in millions) For the Three Months Ended March 31, 2016 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Revenue $ — $ 878.1 $ 96.1 $ — $ 974.2 Costs of revenue, excluding depreciation and amortization — 777.2 107.2 — 884.4 Depreciation and amortization — 31.3 7.7 — 39.0 General and administrative expenses 0.6 50.0 9.4 — 60.0 Interest expense (income), net — 27.4 (15.2 ) — 12.2 Equity in earnings of unconsolidated affiliates — — (3.1 ) — (3.1 ) Other income, net — (11.3 ) (2.1 ) — (13.4 ) Loss (income) before income taxes $ (0.6 ) $ 3.4 $ (7.8 ) $ — $ (5.0 ) Benefit from (provision for) income taxes 0.2 (1.3 ) 3.2 — 2.1 Net loss (income) before equity in losses from subsidiaries $ (0.4 ) $ 2.1 $ (4.6 ) $ — $ (2.9 ) Equity in losses from subsidiaries, net of tax (2.3 ) — — 2.3 — Net (loss) income $ (2.7 ) $ 2.1 $ (4.6 ) $ 2.3 $ (2.9 ) Net loss attributable to non-controlling interests — — (0.2 ) — (0.2 ) Net (loss) income attributable to MasTec, Inc. $ (2.7 ) $ 2.1 $ (4.4 ) $ 2.3 $ (2.7 ) Comprehensive (loss) income $ (5.1 ) $ 2.1 $ (7.0 ) $ 4.7 $ (5.3 ) For the Three Months Ended March 31, 2015 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Revenue $ — $ 803.0 $ 201.7 $ (1.4 ) $ 1,003.3 Costs of revenue, excluding depreciation and amortization — 682.7 205.1 (1.4 ) 886.4 Depreciation and amortization — 32.3 10.3 — 42.6 General and administrative expenses 0.6 66.2 7.2 — 74.0 Interest expense (income), net — 27.1 (16.1 ) — 11.0 Equity in losses of unconsolidated affiliates — — 0.6 — 0.6 Other (income) expense, net — (0.9 ) 0.3 — (0.6 ) Loss before income taxes $ (0.6 ) $ (4.4 ) $ (5.7 ) $ — $ (10.7 ) Benefit from income taxes 0.2 1.7 2.4 — 4.4 Net loss before equity in losses from subsidiaries $ (0.4 ) $ (2.7 ) $ (3.3 ) $ — $ (6.4 ) Equity in losses from subsidiaries, net of tax (5.9 ) — — 5.9 — Net (loss) income $ (6.3 ) $ (2.7 ) $ (3.3 ) $ 5.9 $ (6.4 ) Net loss attributable to non-controlling interests — — (0.1 ) — (0.1 ) Net (loss) income attributable to MasTec, Inc. $ (6.3 ) $ (2.7 ) $ (3.2 ) $ 5.9 $ (6.3 ) Comprehensive (loss) income $ (28.3 ) $ (2.7 ) $ (25.4 ) $ 28.0 $ (28.4 )
Condensed Unaudited Consolidating Balance Sheets	CONDENSED UNAUDITED CONSOLIDATING BALANCE SHEETS (in millions) As of March 31, 2016 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Assets Current assets $ — $ 1,017.8 $ 180.7 $ — $ 1,198.5 Property and equipment, net — 437.9 110.0 — 548.0 Goodwill and other intangible assets, net — 1,043.4 146.1 — 1,189.5 Investments in and advances to consolidated affiliates, net 931.0 78.9 76.0 (1,085.9 ) — Other long-term assets 9.3 19.6 21.8 — 50.7 Total assets $ 940.3 $ 2,597.6 $ 534.6 $ (1,085.9 ) $ 2,986.6 Liabilities and equity Total current liabilities $ — $ 679.0 $ 132.7 $ — $ 811.7 Long-term debt — 909.3 29.4 — 938.7 Other long-term liabilities — 257.4 34.9 — 292.3 Total liabilities $ — $ 1,845.7 $ 197.0 $ — $ 2,042.8 Total equity $ 940.3 $ 751.9 $ 337.6 $ (1,085.9 ) $ 943.9 Total liabilities and equity $ 940.3 $ 2,597.6 $ 534.6 $ (1,085.9 ) $ 2,986.6 As of December 31, 2015 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Assets Current assets $ — $ 927.4 $ 202.4 $ — $ 1,129.8 Property and equipment, net — 448.2 110.5 — 558.7 Goodwill and other intangible assets, net — 1,047.4 140.5 — 1,187.9 Investments in and advances to consolidated affiliates, net 930.3 103.7 50.6 (1,084.6 ) — Other long-term assets 9.3 24.4 17.3 — 51.0 Total assets $ 939.6 $ 2,551.1 $ 521.3 $ (1,084.6 ) $ 2,927.3 Liabilities and equity Total current liabilities $ — $ 632.9 $ 119.6 $ — $ 752.5 Long-term debt — 900.1 32.8 — 932.9 Other long-term liabilities — 275.5 23.0 — 298.5 Total liabilities $ — $ 1,808.5 $ 175.4 $ — $ 1,984.0 Total equity $ 939.6 $ 742.5 $ 345.9 $ (1,084.6 ) $ 943.4 Total liabilities and equity $ 939.6 $ 2,551.0 $ 521.3 $ (1,084.6 ) $ 2,927.3
Condensed Unaudited Consolidating Statements of Cash Flows	CONDENSED UNAUDITED CONSOLIDATING STATEMENTS OF CASH FLOWS (in millions) For the Three Months Ended March 31, 2016 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Net cash (used in) provided by operating activities $ — $ (5.3 ) $ 21.2 $ — $ 15.9 Cash flows (used in) provided by investing activities: Capital expenditures — (12.2 ) (1.1 ) — (13.3 ) Proceeds from sale of property and equipment — 1.5 0.7 — 2.2 Payments for other investments — — (1.5 ) — (1.5 ) Net cash used in investing activities $ — $ (10.7 ) $ (1.9 ) $ — $ (12.6 ) Cash flows provided by (used in) financing activities: Proceeds from credit facilities — 286.8 48.9 — 335.7 Repayments of credit facilities — (270.5 ) (50.2 ) — (320.7 ) Repayments of other borrowings and capital lease obligations — (16.3 ) (4.3 ) — (20.6 ) Proceeds from stock-based awards, net of tax withholdings 2.0 (0.2 ) — — 1.8 Excess tax benefit from stock-based compensation — 0.2 — — 0.2 Net financing activities and advances from (to) consolidated affiliates (2.0 ) 13.6 (11.6 ) — — Net cash provided by (used in) financing activities $ — $ 13.6 $ (17.2 ) $ — $ (3.6 ) Effect of currency translation on cash — — (0.7 ) — (0.7 ) Net (decrease) increase in cash and cash equivalents $ — $ (2.5 ) $ 1.4 $ — $ (1.1 ) Cash and cash equivalents - beginning of period — 4.7 0.3 — 5.0 Cash and cash equivalents - end of period $ — $ 2.2 $ 1.7 $ — $ 3.9 For the Three Months Ended March 31, 2015 MasTec, Inc. Guarantor Subsidiaries Non-Guarantor Subsidiaries Eliminations Consolidated MasTec, Inc. Net cash (used in) provided by operating activities $ (0.4 ) $ 175.9 $ (56.7 ) $ — $ 118.8 Cash flows (used in) provided by investing activities: Cash paid for acquisitions, net of cash acquired — (0.1 ) — — (0.1 ) Capital expenditures — (17.9 ) (1.8 ) — (19.7 ) Proceeds from sale of property and equipment — 1.2 0.2 — 1.4 Payments for other investments $ — $ (32.0 ) $ — $ — $ (32.0 ) Net cash used in investing activities $ — $ (48.8 ) $ (1.6 ) $ — $ (50.4 ) Cash flows provided by (used in) financing activities: Proceeds from credit facilities $ — $ 251.0 $ 188.5 $ — $ 439.5 Repayments of credit facilities — (224.7 ) (180.1 ) — (404.8 ) Repayments of other borrowings and capital lease obligations — (10.7 ) (4.4 ) — (15.1 ) Repurchase of common stock (83.3 ) — — — (83.3 ) Proceeds from stock-based awards, net of tax withholdings 1.1 (0.2 ) — — 0.9 Net financing activities and advances from (to) consolidated affiliates 82.6 (135.7 ) 53.1 — — Net cash provided by (used in) financing activities $ 0.4 $ (120.3 ) $ 57.1 $ — $ (62.8 ) Effect of currency translation on cash — — (1.0 ) — (1.0 ) Net increase (decrease) in cash and cash equivalents $ — $ 6.8 $ (2.2 ) $ — $ 4.6 Cash and cash equivalents - beginning of period — 18.5 5.6 — 24.1 Cash and cash equivalents - end of period $ — $ 25.3 $ 3.4 $ — $ 28.7

Business, Basis of Presentati33

Business, Basis of Presentation and Significant Accounting Policies (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)segment	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Segment Reporting, Disclosure of Entity's Reportable Segments [Abstract]
Number of reportable segments | segment	5
Revenue Recognition [Line Items]
Unapproved change orders, description	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 project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/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.
Revenue [Member] | Product Concentration Risk [Member] | Service Agreements [Member]
Revenue Recognition [Line Items]
Concentration risk, percentage of total	50.00%	52.00%
Contracts Accounted for under Percentage-of-Completion [Member] | Electrical Transmission [Member]
Revenue Recognition [Line Items]
Project losses (in dollars)	$ 15.1
Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Oil and Gas [Member]
Revenue Recognition [Line Items]
Project losses (in dollars)	$ 13.5
Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Power Generation and Industrial [Member]
Revenue Recognition [Line Items]
Project losses (in dollars)		$ 16
Pacer [Member] | Joint Venture [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Other [Member]
Revenue Recognition [Line Items]
Project losses (in dollars)		$ 5.5
Maximum [Member]
Revenue Recognition [Line Items]
Fixed price contract, term within which generally completed (in years)	1 year
Change order approval process, term within which expected to be completed (in years)	1 year
Maximum [Member] | Contracts Accounted for under Percentage-of-Completion [Member]
Revenue Recognition [Line Items]
Change in accounting estimate, percentage-of-completion projects, financial effect on project profit, percentage	5.00%	5.00%
Accounts Receivable [Member]
Revenue Recognition [Line Items]
Unapproved change orders, expected to be billed and collected within one year, amount (in dollars)	$ 20		$ 38

Business, Basis of Presentati34

Business, Basis of Presentation and Significant Accounting Policies (Recently Issued Accounting Pronouncements) (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Senior Notes [Member] | 4.875% Senior Notes [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt instrument, interest rate (percentage)	4.875%
Accounting Standards Update 2015-03 [Member] | Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of new accounting pronouncement, reclassification of deferred financing costs from other assets to debt		$ 12.9
Accounting Standards Update 2015-03 [Member] | Debt [Member] | Credit Facility [Member] | Revolving Credit Facility [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of new accounting pronouncement, reclassification of deferred financing costs from other assets to debt		5.5
Accounting Standards Update 2015-03 [Member] | Debt [Member] | Credit Facility [Member] | Term Loan [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of new accounting pronouncement, reclassification of deferred financing costs from other assets to debt		1
Accounting Standards Update 2015-03 [Member] | Debt [Member] | Senior Notes [Member] | 4.875% Senior Notes [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of new accounting pronouncement, reclassification of deferred financing costs from other assets to debt		$ 6.4

Earnings Per Share (Narrative)

Earnings Per Share (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Computation of earnings per share, methodology	Basic earnings or loss per share is computed by dividing net income or loss available to MasTec’s common shareholders by the weighted average number of common shares outstanding for the period. For purposes of calculating basic and diluted earnings per share, vested restricted stock awards are considered outstanding. Diluted earnings per share is computed by dividing net income available to MasTec’s common shareholders by the weighted average number of fully diluted shares, as calculated under the treasury stock method, which includes the effect of dilutive common stock equivalents, including from the exercise of outstanding stock options or the vesting of unvested restricted shares. If the Company reports a loss, rather than income, the computation of diluted loss per share excludes dilutive common stock equivalents, as their effect would be anti-dilutive. For the three month periods ended March 31, 2016 and 2015, the Company reported a net loss, which resulted in the exclusion of 610,657 and 502,217 weighted average dilutive common stock equivalents, respectively, from the calculation of diluted net loss per share.
Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average anti-dilutive common stock equivalents (in shares)	615,143	807,567
Common Stock Equivalents Excluded Due To Net Loss [Member] | Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average anti-dilutive common stock equivalents (in shares)	610,657	502,217

Earnings Per Share (Schedule of

Earnings Per Share (Schedule of Earnings Per Share Information) (Details) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Net loss attributable to MasTec:
Net loss - basic (in dollars)		$ (2,692)	$ (6,263)
Net loss - diluted (in dollars)	[1]	$ (2,692)	$ (6,263)
Weighted average shares outstanding:
Weighted average shares outstanding - basic		80,156	82,397
Dilutive common stock equivalents (in shares)		0	0
Weighted average shares outstanding - diluted		80,156	82,397
[1]	Calculated as total net loss less amounts attributable to non-controlling interests.

Goodwill and Other Intangible37

Goodwill and Other Intangible Assets (Schedule of Goodwill by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, gross carrying amount	$ 1,064,200
Goodwill, accumulated impairment losses	(72,200)
Goodwill, net	991,975	$ 988,511
Communications [Member]
Goodwill [Line Items]
Goodwill, gross carrying amount	414,900
Goodwill, accumulated impairment losses	0
Goodwill, net	414,900
Oil and Gas [Member]
Goodwill [Line Items]
Goodwill, gross carrying amount	381,800
Goodwill, accumulated impairment losses	(72,200)
Goodwill, net	309,600
Electrical Transmission [Member]
Goodwill [Line Items]
Goodwill, gross carrying amount	149,900
Goodwill, accumulated impairment losses	0
Goodwill, net	149,900
Power Generation and Industrial [Member]
Goodwill [Line Items]
Goodwill, gross carrying amount	117,600
Goodwill, accumulated impairment losses	0
Goodwill, net	$ 117,600

Goodwill and Other Intangible38

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Goodwill [Line Items]
Goodwill, currency translation gains (losses)	$ 3,500,000	$ (12,200,000)
Goodwill, additions from new business combinations	0	0
Amortization expense, intangible assets	5,300,000	7,300,000
Earn-Out Arrangements [Member]
Goodwill [Line Items]
Goodwill, accruals of acquisition-related contingent consideration	0	$ 0
Goodwill Accumulated Impairment Losses [Member]
Goodwill [Line Items]
Goodwill, currency translation gains (losses)	(3,700,000)
Goodwill Gross Carrying Amount [Member]
Goodwill [Line Items]
Goodwill, currency translation gains (losses)	$ 7,200,000

Goodwill and Other Intangible39

Goodwill and Other Intangible Assets (Rollforward of Other Intangible Assets) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Other Intangible Assets [Line Items]
Other intangible assets, gross carrying amount				$ 329,300
Accumulated amortization				(129,900)
Other Intangible Assets [Rollforward]
Other intangible assets, net, beginning balance		$ 199,379
Amortization expense		(5,300)	$ (7,300)
Currency translation adjustments, other intangible assets		3,400
Other intangible assets, net, ending balance		197,503
Customer Relationships and Backlog [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross carrying amount				195,400
Accumulated amortization				(114,600)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance		80,800
Amortization expense		(4,200)
Currency translation adjustments, amortizing intangible assets		600
Other intangible assets, net, amortizing, ending balance		77,200
Other Amortizing Intangible Assets [Member]
Other Intangible Assets [Line Items]
Other intangible assets, amortizing, gross carrying amount	[1]			25,700
Accumulated amortization	[1]			(15,300)
Other Intangible Assets [Rollforward]
Other intangible assets, net, amortizing, beginning balance	[1]	10,400
Amortization expense	[1]	(1,100)
Currency translation adjustments, amortizing intangible assets	[1]	100
Other intangible assets, net, amortizing, ending balance	[1]	9,400
Trade Names [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, carrying amount		34,800		34,800
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance		34,800
Currency translation adjustments, non-amortizing intangible assets		0
Other intangible assets, non-amortizing, ending balance		34,800
Pre-Qualifications [Member]
Other Intangible Assets [Line Items]
Other intangible assets, non-amortizing, carrying amount		73,400		$ 73,400
Other Intangible Assets [Rollforward]
Other intangible assets, non-amortizing, beginning balance		73,400
Currency translation adjustments, non-amortizing intangible assets		2,700
Other intangible assets, non-amortizing, ending balance		$ 76,100
[1]	Consists principally of trade names and non-compete agreements.

Fair Value of Financial Instr40

Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Narrative) (Details) - Earn-Out Arrangements [Member] - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Additions from new business combinations, ASC 805 contingent consideration	$ 0	$ 0
Payments of ASC 805 contingent consideration	0	0
Foreign Currency Translation Adjustments [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Foreign currency translation (losses) gains, other comprehensive income, ASC 805 contingent consideration	(600,000)	$ 4,600,000
Other Income, Net [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Reduction in ASC 805 contingent consideration, gain included in earnings	2,300,000
Level 3 [Member] | Fair Value [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
ASC 805 contingent consideration, fair value	$ 56,700,000		$ 58,400,000
Level 3 [Member] | Fair Value Measurements, Recurring [Member]
Fair Value, Financial Instruments Measured on a Recurring Basis [Line Items]
Fair value measurements, valuation techniques	The fair value of ASC 805 contingent consideration is based on management estimates and entity-specific assumptions, which are Level 3 inputs, and is evaluated on an ongoing basis.

Fair Value of Financial Instr41

Fair Value of Financial Instruments (Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis) (Narrative) (Details) - Senior Notes [Member] - 4.875% Senior Notes [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Debt instrument, interest rate (percentage)	4.875%
Fair Value Measurements, Non-Recurring [Member] | Level 1 [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Fair value measurements, valuation techniques	the estimated fair value of the Company’s 4.875% Senior Notes, based on quoted market prices in active markets, a Level 1 input
Fair Value Measurements, Non-Recurring [Member] | Carrying Amount [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
4.875% Senior Notes (in dollars)	$ 400	$ 400
Fair Value Measurements, Non-Recurring [Member] | Fair Value [Member] | Level 1 [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
4.875% Senior Notes (in dollars)	$ 354	$ 344

Fair Value of Financial Instr42

Fair Value of Financial Instruments (Cost and Equity Method Investments) (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		13 Months Ended
	Apr. 30, 2016	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Aggregate carrying value, cost and equity method investment assets		$ 20,400,000		$ 20,400,000	$ 16,700,000
Other comprehensive loss, unrecognized unrealized fair market value losses, net of tax		8,010,000	$ 0
Other long-term liabilities, equity method investments		77,361,000		77,361,000	68,119,000
Equity method investments, earnings related to expected recoveries		3,066,000	(585,000)
Unconsolidated affiliates, financing commitments, amounts paid		1,514,000	$ 31,959,000
Performance Guarantees [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Guarantees issued, related parties		147,800,000		147,800,000	539,300,000
Credit Facility [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued		403,800,000		403,800,000	292,800,000
Equity Method Investees [Member] | Waha JVs [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Revenue, related parties		10,300,000
Receivables, related parties		8,300,000		8,300,000
Other long-term liabilities, equity method investments		18,000,000		18,000,000	4,400,000
Equity Method Investees [Member] | Waha JVs [Member] | Interest Rate Swaps [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Other comprehensive loss, unrecognized unrealized fair market value losses, before tax		13,000,000
Other comprehensive loss, unrecognized unrealized fair market value losses, net of tax		8,000,000
Equity Method Investees [Member] | Waha JVs [Member] | Credit Facility [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued		155,000,000		155,000,000	86,000,000
Equity Method Investees [Member] | Waha JVs [Member] | Credit Facility [Member] | Subsequent Event [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued	$ 165,000,000
Letters of credit issued, increase	$ 10,000,000
Equity Method Investees [Member] | Waha JVs [Member] | Credit Facility [Member] | Financial Standby [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Letters of credit issued		$ 78,000,000		$ 78,000,000	$ 78,000,000
Equity Method Investees [Member] | Pacer [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Number of joint ventures		2		2
Equity method investment, expected collection period (in months)		12 months
Equity Method Investees [Member] | Pacer [Member] | Canadian Dollars [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Receivables, related parties		$ 4,000,000		$ 4,000,000
Equity Method Investees [Member] | Pacer [Member] | Canadian Dollars [Member] | Financial Support [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Equity method investments, earnings related to expected recoveries				3,600,000
Unconsolidated affiliates, financing commitments, amounts paid				39,900,000
Unconsolidated affiliates, financing commitments, amounts repaid				12,800,000
Equity Method Investees [Member] | Pacer [Member] | Financial Guarantees [Member] | Canadian Dollars [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Guarantees issued, related parties		$ 0		$ 0
Equity Method Investees [Member] | Pacer [Member] | Performance Guarantees [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Construction projects, percentage complete		100.00%		100.00%
Immediate Family Member of Management or Principal Owner [Member] | Cost Method Investment [Member] | Cross Country Pipeline [Member]
Fair Value, Financial Instruments Measured on a Non-Recurring Basis [Line Items]
Cost method investment, original cost		$ 15,000,000		$ 15,000,000

Accounts Receivable, Net of A43

Accounts Receivable, Net of Allowance (Schedule of Accounts Receivable, Net of Allowance) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts Receivable, Net of Allowance
Contract billings	$ 478,900	$ 437,300
Retainage	145,500	148,800
Costs and earnings in excess of billings	354,000	332,700
Accounts receivable, gross	978,400	918,800
Less allowance for doubtful accounts	(7,500)	(7,700)
Accounts receivable, net	$ 970,886	$ 911,106

Accounts Receivable, Net of A44

Accounts Receivable, Net of Allowance (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Receivables [Abstract]
Provisions for doubtful accounts	$ 0.4	$ 0.5

Property and Equipment, Net (Sc

Property and Equipment, Net (Schedule of Property and Equipment, Net) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property and Equipment [Line Items]
Property and equipment	$ 1,103,900	$ 1,086,900
Less accumulated depreciation and amortization	(555,900)	(528,200)
Property and equipment, net	547,957	558,667
Land [Member]
Property and Equipment [Line Items]
Property and equipment	4,600	4,600
Building and Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment	21,900	21,700
Machinery and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	923,400	912,900
Office Furniture and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	140,300	136,900
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment	$ 13,700	$ 10,800

Property and Equipment, Net (Na

Property and Equipment, Net (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property and Equipment [Line Items]
Capitalized internal-use software, gross	$ 104,700		$ 101,400
Capitalized internal-use software, net	34,200		$ 33,400
Depreciation and amortization	39,008	$ 42,598
Property and Equipment [Member]
Property and Equipment [Line Items]
Depreciation and amortization	$ 33,700	$ 35,300

Debt (Schedule of Carrying Valu

Debt (Schedule of Carrying Values of Debt) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Capital lease obligations	$ 117,900	$ 130,900
Total debt	1,024,800	1,023,200
Less unamortized deferred financing costs	(12,000)	(12,900)
Less current maturities	(74,055)	(77,400)
Long-term debt	$ 938,722	932,868
Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Oct. 29, 2018
Credit Facility [Member] | Revolving Loans [Member]
Debt Instrument [Line Items]
Carrying value of debt	$ 230,900	208,500
Credit Facility [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, maturity date	Nov. 21, 2019
Carrying value of debt	$ 246,900	250,000
Senior Notes [Member] | 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 15, 2023
Carrying value of debt	$ 400,000	400,000
Other Credit Facilities [Member]
Debt Instrument [Line Items]
Carrying value of debt	$ 14,900	16,400
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations, expiration date, range, end	Jun. 13, 2021
Notes Payable [Member] | Equipment [Member]
Debt Instrument [Line Items]
Notes payable, maturity date, range, end	May 31, 2018
Carrying value of debt	$ 14,200	$ 17,400

Debt (Schedule of Carrying Va48

Debt (Schedule of Carrying Values of Debt) (Interest Rates) (Details)	Mar. 31, 2016
Senior Notes [Member] | 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)	4.875%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Debt instrument, weighted average interest rate (percentage)	2.80%
Notes Payable [Member] | Equipment [Member]
Debt Instrument [Line Items]
Debt instrument, weighted average interest rate (percentage)	2.80%

Debt (Senior Secured Credit Fac

Debt (Senior Secured Credit Facility) (Narrative) (Details) - Credit Facility [Member] - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,250,000,000		$ 1,250,000,000
Line of credit facility, letters of credit issued	$ 403,800,000	$ 292,800,000	$ 403,800,000
Line of credit facility, unused facility fee (percentage)	0.40%	0.40%
Line of credit facility, collateral			The Credit Facility is guaranteed by certain subsidiaries of the Company (the “Guarantor Subsidiaries”), and the obligations under the Credit Facility are secured by substantially all of the Company’s and the Guarantor Subsidiaries’ respective assets, subject to certain exceptions.
Revolving Loans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 1,000,000,000		$ 1,000,000,000
Line of credit facility, remaining borrowing capacity	365,300,000	$ 498,700,000	365,300,000
Line of credit facility, capacity available for foreign currencies	$ 104,600,000	$ 111,800,000	$ 104,600,000
Revolving Loans [Member] | Weighted Average [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	3.38%	2.95%	3.38%
Term Loan [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 246,900,000		$ 246,900,000
Line of credit facility, interest rate (percentage)	2.43%	2.42%	2.43%
Letters of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, capacity available for letters of credit	$ 46,200,000	$ 157,200,000	$ 46,200,000
Letters of Credit [Member] | Performance Guarantees [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	1.00%	1.00%	1.00%
Letters of Credit [Member] | Financial Standby [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	2.00%	2.00%	2.00%

Debt (Other Credit Facilities)

Debt (Other Credit Facilities) (Narrative) (Details) - Other Credit Facilities [Member] CAD in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2016CAD	Mar. 31, 2016USD ($)	Dec. 31, 2015CAD	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity (in dollars) | CAD	CAD 40		CAD 40
Line of credit facility, amount outstanding (in dollars)		$ 14.9		$ 16.4
Line of credit facility, rationale for classification as long-term debt	Outstanding borrowings that are not renewed are repaid with borrowings under the Credit Facility. Accordingly, the carrying amounts of the Company’s borrowings under its other credit facilities are classified within long-term debt in the Company’s consolidated balance sheets.
Weighted Average [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate (percentage)	3.60%	3.60%	3.60%	3.60%
Canadian Dollars [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity (in dollars)		$ 30.8		$ 28.9
Line of credit facility, amount outstanding (in dollars)		$ 14.9		$ 16.4

Debt (Debt Guarantees and Coven

Debt (Debt Guarantees and Covenants) (Narrative) (Details) - Senior Notes [Member] - 4.875% Senior Notes [Member]	3 Months Ended
	Mar. 31, 2016
Debt Instrument [Line Items]
Debt instrument, guarantees	The 4.875% Senior Notes are senior unsecured unsubordinated obligations and rank equal in right of payment with existing and future unsubordinated debt, and rank senior in right of payment to existing and future subordinated debt and are fully and unconditionally guaranteed on an unsecured, unsubordinated, joint and several basis by certain of the Company’s existing and future 100%-owned direct and indirect domestic subsidiaries that are each guarantors of the Credit Facility or other outstanding indebtedness.
Debt instrument, interest rate (percentage)	4.875%

Debt (Narrative) (Details)

Debt (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Senior Notes [Member] | 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate (percentage)	4.875%
Other Accrued Expenses [Member]
Debt Instrument [Line Items]
Debt instrument, accrued interest payable	$ 3.4	$ 7.7
Accounting Standards Update 2015-03 [Member] | Debt [Member]
Debt Instrument [Line Items]
Adoption of new accounting pronouncement, reclassification of deferred financing costs from other assets to debt		(12.9)
Accounting Standards Update 2015-03 [Member] | Debt [Member] | Senior Notes [Member] | 4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Adoption of new accounting pronouncement, reclassification of deferred financing costs from other assets to debt		(6.4)
Accounting Standards Update 2015-03 [Member] | Debt [Member] | Revolving Credit Facility [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Adoption of new accounting pronouncement, reclassification of deferred financing costs from other assets to debt		(5.5)
Accounting Standards Update 2015-03 [Member] | Debt [Member] | Term Loan [Member] | Credit Facility [Member]
Debt Instrument [Line Items]
Adoption of new accounting pronouncement, reclassification of deferred financing costs from other assets to debt		$ (1)

Lease Obligations (Capital Leas

Lease Obligations (Capital Leases) (Narrative) (Details) - Property and Equipment [Member] - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Capital Leases [Line Items]
Assets held under capital lease, gross	$ 285	$ 286.3
Assets held under capital lease, net	$ 185.6	$ 193.3

Lease Obligations (Operating Le

Lease Obligations (Operating Leases) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Lease Term in Excess of One Year [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense (in dollars)	$ 24.6	$ 20.1
Lease Term in Excess of One Year [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Operating leases, term of contract (in years)	1 year	1 year
Lease Term of One Year or Less [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense (in dollars)	$ 46.5	$ 42.8
Lease Term of One Year or Less [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases, term of contract (in years)	1 year	1 year

Stock-Based Compensation and 55

Stock-Based Compensation and Other Employee Benefit Plans (Narrative) (Details) - Common Stock [Member] - shares	Mar. 31, 2016	Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	5,363,000
Additional Shares That Became Available [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant		1,000,000

Stock-Based Compensation and 56

Stock-Based Compensation and Other Employee Benefit Plans (Restricted Shares) (Narrative) (Details) - Restricted Shares [Member] - USD ($) $ in Millions	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, unearned compensation	$ 25.2	$ 25.2
Stock-based compensation awards, unearned compensation, weighted average expected recognition period (in years)	2 years
Stock-based compensation, vested awards, intrinsic value		$ 0.2	$ 2.6

Stock-Based Compensation and 57

Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Restricted Shares) (Details)	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Restricted Shares [Member]
Restricted Shares
Non-vested restricted shares, ending balance (in shares)	1,952,832
Restricted Shares [Member] | Common Stock [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	1,630,232	[1]
Granted (in shares)	421,037
Vested (in shares)	(14,937)
Canceled/forfeited (in shares)	(35,250)
Non-vested restricted shares, ending balance (in shares)	2,001,082	[1]
Per Share Weighted Average Grant Date Fair Value
Non-vested restricted shares, per share weighted average grant date fair value, beginning balance (in dollars per share) | $ / shares	$ 22.94
Granted (in dollars per share) | $ / shares	12.81
Vested (in dollars per share) | $ / shares	13.26
Canceled/forfeited (in dollars per share) | $ / shares	24.57
Non-vested restricted shares, per share weighted average grant date fair value, ending balance (in dollars per share) | $ / shares	$ 20.85
Restricted Stock Units [Member]
Restricted Shares
Non-vested restricted shares, beginning balance (in shares)	32,250	[1]
Non-vested restricted shares, ending balance (in shares)	48,250	[1]
[1]	Includes 48,250 and 32,250 restricted stock units as of March 31, 2016 and December 31, 2015, respectively.

Stock-Based Compensation and 58

Stock-Based Compensation and Other Employee Benefit Plans (Stock Options) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised, intrinsic value (in dollars)	$ 0.7	$ 0.5
Stock options exercised, proceeds (in dollars)	$ 1.4	$ 0.3
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation awards, stock options, vested (percentage)	100.00%

Stock-Based Compensation and 59

Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Stock Options) (Details) - USD ($) $ / shares in Units, $ in Millions		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value
Options outstanding, vested, weighted average remaining contractual life (in years)		4 months 2 days	6 months 18 days
Options exercisable, weighted average remaining contractual life (in years)		4 months 2 days	6 months 18 days
Options outstanding, vested, aggregate intrinsic value (in dollars)	[1]	$ 0.7	$ 0.9	$ 0.7
Options exercisable, aggregate intrinsic value (in dollars)	[1]	$ 0.7	$ 0.9	$ 0.7
Common Stock [Member]
Stock Options
Options outstanding, vested, beginning balance (in shares)				202,700
Options exercisable, beginning balance (in shares)				202,700
Exercised (in shares)				(102,700)
Options outstanding, vested, ending balance (in shares)		100,000	202,700	100,000
Options exercisable, ending balance (in shares)		100,000	202,700	100,000
Per Share Weighted Average Exercise Price
Options outstanding, vested, per share weighted average exercise price, beginning balance (in dollars per share)				$ 13.06
Options exercisable, per share weighted average exercise price, beginning balance (in dollars per share)				13.06
Options outstanding, vested, per share weighted average exercise price, ending balance (in dollars per share)		$ 12.93	$ 13.06	12.93
Options exercisable, per share weighted average exercise price, ending balance (in dollars per share)		$ 12.93	$ 13.06	12.93
Common Stock [Member] | Stock Options [Member]
Per Share Weighted Average Exercise Price
Exercised (in dollars per share)				$ 13.19
[1]	Amount represents the difference between the exercise price and the closing share price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.

Stock-Based Compensation and 60

Stock-Based Compensation and Other Employee Benefit Plans (Employee Stock Purchase Plans) (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016
Employee Stock Purchase Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation plans, description	The Company has certain employee stock purchase plans (collectively “ESPPs”) under which shares of the Company's common stock are available for purchase by eligible employees.

Stock-Based Compensation and 61

Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Activity, Employee Stock Purchase Plans) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Common Stock [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Common shares issued (in shares)	43,172	57,258
Employee Stock Purchase Plans [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Cash proceeds (in dollars)	$ 0.6	$ 0.9
Employee Stock Purchase Plans [Member] | Common Stock [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Weighted average price per share (in dollars per share)	$ 14.77	$ 16.41
Weighted average per share grant date fair value (in dollars per share)	$ 4.03	$ 4.43

Stock-Based Compensation and 62

Stock-Based Compensation and Other Employee Benefit Plans (Schedule of Non-Cash Stock-Based Compensation Expense and Related Tax Benefits) (Details) - USD ($)		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Non-cash stock-based compensation expense		$ 3,523,000	$ 3,575,000
Income Tax Effects:
Income tax benefit from non-cash stock-based compensation		1,600,000	1,400,000
Excess tax benefit from non-cash stock-based compensation	[1]	248,000	0
General and Administrative Expenses [Member]
Stock-Based Compensation and Other Employee Benefit Plans [Line Items]
Non-cash stock-based compensation expense		$ 3,500,000	$ 3,600,000
[1]	Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense associated with exercised stock options and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows. There were no excess tax benefits for the three month period ended March 31, 2015.

Other Retirement Plans (Narrati

Other Retirement Plans (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016
Multiemployer Plans [Abstract]
Multiemployer plans, general nature	Certain of MasTec’s subsidiaries, including certain subsidiaries in Canada, contribute amounts to multiemployer pension and other multiemployer benefit plans and trusts, which are recorded as a component of employee wages and salaries within costs of revenue, excluding depreciation and amortization. Contributions are generally based on fixed amounts per hour per employee for employees covered under these plans. Multiemployer plan contribution rates are determined annually and assessed on a “pay-as-you-go” basis based on union employee payrolls. Union payrolls cannot be determined for future periods because the number of union employees employed at any given time, and the plans in which they may participate, vary depending upon the location and number of ongoing projects at a given time and the need for union resources in connection with those projects.

Other Retirement Plans (Schedul

Other Retirement Plans (Schedule of Covered Employees and Contributions, Multiemployer Plans) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)employee	Mar. 31, 2015USD ($)employee
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, contributions (in dollars)	$ 7	$ 5.6
Multiemployer Plans, Pension [Member]
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, contributions (in dollars)	4.8	3.4
Multiemployer Plans, Other Multiemployer [Member]
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, contributions (in dollars)	$ 2.2	$ 2.2
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees [Member] | Low [Member]
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, covered employees (in number of employees) | employee	1,112	590
Workforce Subject to Collective Bargaining Arrangements [Member] | Unionized Employees [Member] | High [Member]
Covered Employees and Contributions, Multiemployer Plans [Line Items]
Multiemployer plans, covered employees (in number of employees) | employee	1,409	1,124

Equity (Share Activity) (Narrat

Equity (Share Activity) (Narrative) (Details) - 2016 Share Repurchase Program [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Feb. 25, 2016
Equity, Treasury Stock [Line Items]
Share repurchase program, amount authorized, value (in dollars)		$ 100
Common Stock [Member]
Equity, Treasury Stock [Line Items]
Common stock repurchases (in shares)	0

Equity (Accumulated Other Compr

Equity (Accumulated Other Comprehensive Loss) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Accumulated Other Comprehensive Loss [Line Items]
Accumulated other comprehensive losses	$ 74,737		$ 72,351
Unrealized foreign currency translation gains (losses)	5,624	$ (22,028)
Other comprehensive loss, unrecognized unrealized fair market value losses, net of tax	8,010	$ 0
Equity Method Investees [Member] | Waha JVs [Member] | Interest Rate Swaps [Member]
Accumulated Other Comprehensive Loss [Line Items]
Other comprehensive loss, unrecognized unrealized fair market value losses, before tax	13,000
Other comprehensive loss, unrecognized unrealized fair market value losses, net of tax	$ 8,000

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Quarterly provision for income taxes, description	In determining the quarterly provision for income taxes, management uses an estimated annual effective tax rate based on forecasted annual pre-tax income, permanent tax differences, statutory tax rates and tax planning opportunities in the various jurisdictions in which the Company operates. The effect of significant discrete items is separately recognized in the quarter(s) in which they occur.
Current deferred tax assets, net	$ 13,100	$ 19,200
Long-term deferred tax liabilities, net	$ 174,396	$ 188,759

Segments and Related Informat68

Segments and Related Information (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)segment	Mar. 31, 2015USD ($)
Segments and Related Information [Line Items]
Segment reporting information, factors used to identify entity's reportable segments	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.
Number of operating segments | segment	5
Number of reportable segments | segment	5
Segment reporting information, description of products and services	All five reportable segments derive their revenue from the engineering, installation and maintenance of infrastructure, primarily in North America.
Segment reporting, description of all other segments	The Other segment includes a proportionately consolidated non-controlled Canadian joint venture, equity method investments and other small business units that perform construction and other services in a variety of international end-markets.
General and administrative expenses (in dollars)	$ 60,048	$ 74,030
Other Current Liabilities [Member]
Segments and Related Information [Line Items]
Restructuring reserve, current (in dollars)	$ 2,000
Corporate [Member] | Audit Committee Independent Investigation [Member]
Segments and Related Information [Line Items]
General and administrative expenses (in dollars)		3,000
Communications [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services	The Communications segment performs engineering, construction and maintenance of communications infrastructure primarily related to wireless and wireline/fiber communications and install-to-the-home customers, and, to a lesser extent, distribution infrastructure for electrical utilities, among others.
Business combinations, acquisition integration costs (in dollars)		8,800
Oil and Gas [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services	MasTec performs engineering, construction and maintenance services on oil and natural gas pipelines and processing facilities for the energy and utilities industries through its Oil and Gas segment.
Restructuring charges (in dollars)	$ 3,400
Oil and Gas [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member]
Segments and Related Information [Line Items]
Project losses (in dollars)	$ 13,500
Electrical Transmission [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services	The Electrical Transmission segment primarily serves the energy and utility industries through the engineering, construction and maintenance of electrical transmission lines and substations.
Restructuring charges (in dollars)	$ 700
Electrical Transmission [Member] | Contracts Accounted for under Percentage-of-Completion [Member]
Segments and Related Information [Line Items]
Project losses (in dollars)	$ 15,100
Power Generation and Industrial [Member]
Segments and Related Information [Line Items]
Segment reporting information, description of products and services	The Power Generation and Industrial segment primarily serves energy, utility and other end-markets through the installation and construction of conventional and renewable power facilities, related electrical transmission infrastructure, ethanol/biofuel facilities and various types of industrial infrastructure.
Power Generation and Industrial [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member]
Segments and Related Information [Line Items]
Project losses (in dollars)		16,000
Other [Member] | Contracts Accounted for under Percentage-of-Completion [Member] | Canadian Dollars [Member] | Pacer [Member] | Joint Venture [Member]
Segments and Related Information [Line Items]
Project losses (in dollars)		$ 5,500

Segments and Related Informat69

Segments and Related Information (Schedule of Financial Information by Reportable Segment - Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
Revenue (in dollars)	$ 974,225	$ 1,003,268
Communications [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Utilities [Member]
Revenue:
Utilities customers, percentage of Communications segment revenue	10.40%	8.80%
Reportable Segments [Member] | Communications [Member]
Revenue:
Revenue (in dollars)	$ 511,600	$ 469,900
Reportable Segments [Member] | Oil and Gas [Member]
Revenue:
Revenue (in dollars)	292,700	326,800
Reportable Segments [Member] | Electrical Transmission [Member]
Revenue:
Revenue (in dollars)	86,300	116,000
Reportable Segments [Member] | Power Generation and Industrial [Member]
Revenue:
Revenue (in dollars)	81,400	84,300
Reportable Segments [Member] | Other [Member]
Revenue:
Revenue (in dollars)	3,400	6,600
Eliminations [Member]
Revenue:
Revenue (in dollars)	$ (1,200)	$ (300)

Segments and Related Informat70

Segments and Related Information (Schedule of Financial Information by Reportable Segment - EBITDA) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
EBITDA:
EBITDA		$ 46,200	$ 42,800
Equity in earnings (losses) of unconsolidated affiliates		3,066	(585)
Oil and Gas [Member]
EBITDA:
Equity in earnings (losses) of unconsolidated affiliates		3,600	(600)
Other [Member]
EBITDA:
Equity in earnings (losses) of unconsolidated affiliates		(500)
Reportable Segments [Member] | Communications [Member]
EBITDA:
EBITDA		61,700	51,700
Reportable Segments [Member] | Oil and Gas [Member]
EBITDA:
EBITDA	[1]	16,200	21,500
Reportable Segments [Member] | Electrical Transmission [Member]
EBITDA:
EBITDA		(23,800)	(2,500)
Reportable Segments [Member] | Power Generation and Industrial [Member]
EBITDA:
EBITDA		2,900	(8,900)
Reportable Segments [Member] | Other [Member]
EBITDA:
EBITDA	[2]	200	(5,100)
Corporate [Member]
EBITDA:
EBITDA		$ (11,000)	$ (13,900)
[1]	Oil and Gas EBITDA includes equity in earnings from unconsolidated affiliates of $3.6 million for the three month period ended March 31, 2016, and equity in losses from unconsolidated affiliates of $0.6 million for the three month period ended March 31, 2015.
[2]	Other EBITDA includes equity in losses from unconsolidated affiliates of $0.5 million for the three month period ended March 31, 2016.

Segments and Related Informat71

Segments and Related Information (Schedule of Financial Information by Reportable Segment - Depreciation and Amortization) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Depreciation and Amortization:
Depreciation and amortization	$ 39,008	$ 42,598
Reportable Segments [Member] | Communications [Member]
Depreciation and Amortization:
Depreciation and amortization	12,300	12,000
Reportable Segments [Member] | Oil and Gas [Member]
Depreciation and Amortization:
Depreciation and amortization	18,200	22,000
Reportable Segments [Member] | Electrical Transmission [Member]
Depreciation and Amortization:
Depreciation and amortization	5,200	5,200
Reportable Segments [Member] | Power Generation and Industrial [Member]
Depreciation and Amortization:
Depreciation and amortization	1,500	1,600
Reportable Segments [Member] | Other [Member]
Depreciation and Amortization:
Depreciation and amortization	0	100
Corporate [Member]
Depreciation and Amortization:
Depreciation and amortization	$ 1,800	$ 1,700

Segments and Related Informat72

Segments and Related Information (Reconciliation of EBITDA to Consolidated Loss before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
EBITDA Reconciliation:
EBITDA	$ 46,200	$ 42,800
Interest expense, net	(12,158)	(10,973)
Depreciation and amortization	(39,008)	(42,598)
Loss before income taxes	$ (4,968)	$ (10,740)

Segments and Related Informat73

Segments and Related Information (Foreign Operations) (Narrative) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Segments and Related Information [Line Items]
Revenue			$ 974,225	$ 1,003,268
Property and equipment, net	$ 547,957	$ 558,667	547,957
Intangible assets and goodwill, net	$ 1,189,500	$ 1,187,900	1,189,500
Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member] | Credit Concentration Risk [Member] | Foreign Customers [Member]
Segments and Related Information [Line Items]
Concentration risk, percentage of total	13.00%	17.00%
United States [Member]
Segments and Related Information [Line Items]
Revenue			890,700	820,200
Property and equipment, net	$ 453,800	$ 464,600	453,800
Intangible assets and goodwill, net	1,100,000	1,100,000	1,100,000
Foreign Operations [Member]
Segments and Related Information [Line Items]
Revenue			83,500	$ 183,100
Property and equipment, net	94,200	94,100	94,200
Intangible assets and goodwill, net	$ 113,700	$ 107,300	$ 113,700

Segments and Related Informat74

Segments and Related Information (Schedule of Significant Customers, Revenue Concentration Information) (Details) - Customer Concentration Risk [Member] - Revenue [Member]		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Communications [Member] | AT&T (including DIRECTV) [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	[1],[2]	39.00%	32.00%
Oil and Gas [Member] | Energy Transfer Affiliates [Member]
Revenue, Significant Customers [Line Items]
Significant customers, percentage of total consolidated revenue	[3]	18.00%	5.00%
[1]	DIRECTV® was acquired by AT&T in July 2015. Revenue from DIRECTV® is presented on a combined basis with AT&T for all periods.
[2]	The Company’s relationship with AT&T is based upon multiple separate master service agreements, other service agreements and construction/installation contracts for AT&T’s (i) wireless, (ii) wireline/fiber, (iii) home security and automation businesses, and (iv) for DIRECTV® services, is based upon an agreement to provide installation and maintenance services. Revenue from AT&T is included in the Communications segment.
[3]	The Company's relationship with Energy Transfer affiliates is based upon various construction contracts for pipeline activities with Energy Transfer Partners L.P., Sunoco Logistics Partners L.P., and their subsidiaries and affiliates, all of which are consolidated by Energy Transfer Equity, L.P. Revenue from Energy Transfer affiliates is included in the Oil and Gas segment.

Commitments and Contingencies (

Commitments and Contingencies (Other Commitments and Contingencies) (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Nov. 30, 2011
Central States Southeast And Southwest Areas Pension Fund [Member] | Multiemployer Plans, Pension [Member]
Commitments and Contingencies [Line Items]
Multiemployer plans, withdrawal obligation		$ 3		$ 6.4
Multiemployer plans, withdrawal obligation, payments			$ 3
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve	$ 76.4	76.1	76.4
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Liabilities [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve, non-current	46.6	47.5	46.6
Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member] | Other Long-Term Assets [Member] | Cash [Member]
Commitments and Contingencies [Line Items]
Cash collateral deposited with insurance carriers	1.3	1.3	1.3
Uninsured Risk [Member] | Employee Group Medical Claims Policies [Member]
Commitments and Contingencies [Line Items]
Self insurance reserve	2	1.6	2
Performance and Payment Bonds [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount	147.8	539.3	147.8
Performance and Payment Bonds [Member] | Estimate [Member]
Commitments and Contingencies [Line Items]
Bonded projects, costs to complete	21.6	36
Surety Bond [Member] | Uninsured Risk [Member] | Workers Compensation [Member]
Commitments and Contingencies [Line Items]
Outstanding bonds, amount	13.4	13.4	13.4
Credit Facility [Member]
Commitments and Contingencies [Line Items]
Letters of credit issued	403.8	292.8	403.8
Credit Facility [Member] | Financial Guarantees [Member] | Uninsured Risk [Member] | Workers Compensation, General and Automobile Policies [Member]
Commitments and Contingencies [Line Items]
Letters of credit issued	$ 83.2	$ 83.2	$ 83.2

Commitments and Contingencies76

Commitments and Contingencies (Other Guarantees) (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016USD ($)
Other Guarantees [Line Items]
General warranty, description	MasTec also generally warrants the work it performs for a one to two year period following substantial completion of a project.
General warranty, accrued reserve (in dollars)	$ 0
Warranty [Member] | Minimum [Member]
Other Guarantees [Line Items]
General warranty, period (in years)	1 year
Warranty [Member] | Maximum [Member]
Other Guarantees [Line Items]
General warranty, period (in years)	2 years
Subsidiaries [Member]
Other Guarantees [Line Items]
Other guarantees, description	In the ordinary course of its business, from time to time, MasTec guarantees the obligations of its subsidiaries, including obligations under certain contracts with customers, certain lease obligations and in some states, obligations in connection with obtaining contractors’ licenses.

Commitments and Contingencies77

Commitments and Contingencies (Concentrations of Risk) (Narrative) (Details) - customer	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Concentration Risk [Line Items]
Number of customers			310
Credit Concentration Risk [Member] | Customer with Highest Net Accounts Receivable Position [Member] | Accounts Receivable, Net, Less Billings in Excess of Costs and Earnings [Member]
Concentration Risk [Line Items]
Number of customers	1
Concentration risk, percentage of total	14.00%	12.00%
Customer Concentration Risk [Member] | Ten Largest Customers [Member] | Revenue [Member]
Concentration Risk [Line Items]
Number of customers			10	10
Concentration risk, percentage of total			73.00%	60.00%

Related Party Transactions (Pro

Related Party Transactions (Proportionately Consolidated Non-Controlled Canadian Contractual Joint Venture) (Narrative) (Details) CAD in Millions	1 Months Ended	3 Months Ended
	May. 05, 2016USD ($)	Mar. 31, 2016USD ($)	Mar. 31, 2015USD ($)	Mar. 31, 2016CAD	Mar. 31, 2016USD ($)	Dec. 31, 2015CAD	Dec. 31, 2015USD ($)
Related Party Transaction [Line Items]
Unconsolidated affiliates, financing commitments, amounts paid		$ 1,514,000	$ 31,959,000
Performance Guarantees [Member]
Related Party Transaction [Line Items]
Guarantees issued, related parties					$ 147,800,000		$ 539,300,000
Pacer [Member] | Joint Venture [Member] | Performance Guarantees [Member]
Related Party Transaction [Line Items]
Guarantees issued, related parties | CAD				CAD 132.1		CAD 132.1
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member]
Related Party Transaction [Line Items]
Proportionately consolidated joint venture, ownership percentage				35.00%	35.00%
Revenue, related party		300,000	$ 600,000
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member] | Financial Support [Member]
Related Party Transaction [Line Items]
Unconsolidated affiliates, financing commitments, amounts paid		$ 3,500,000
Unconsolidated affiliates, outstanding commitments					$ 0
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member] | Financial Support [Member] | Subsequent Event [Member]
Related Party Transaction [Line Items]
Unconsolidated affiliates, financing commitments, amounts paid	$ 1,400,000
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member] | Performance Guarantees [Member]
Related Party Transaction [Line Items]
Guarantees issued, related parties					101,600,000		95,400,000
Pacer [Member] | Joint Venture [Member] | Canadian Dollars [Member] | Accounts Receivable [Member]
Related Party Transaction [Line Items]
Receivables, joint venture					$ 800,000		$ 1,200,000

Related Party Transactions (CCP

Related Party Transactions (CCP) (Narrative) (Details) - Cross Country Pipeline [Member] - Immediate Family Member of Management or Principal Owner [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Equipment [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 0.8	$ 1.7
Rebates from related party	0.4
Accounts payable, related party	0.7		$ 0.6
Cost Method Investment [Member]
Related Party Transaction [Line Items]
Cost method investment, original cost	$ 15

Related Party Transactions (Oth

Related Party Transactions (Other Related Party Transactions) (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016USD ($)employee	Mar. 31, 2015USD ($)	Dec. 31, 2015USD ($)
Executive Officers [Member] | Subcontractor Ancillary Services [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 1,500,000
Accounts payable, related party	1,200,000
Executive Officers [Member] | Related Customer [Member] | Employee Leasing Arrangements [Member]
Related Party Transaction [Line Items]
Charges to related party	200,000	$ 200,000
Due from related party	100,000		$ 100,000
Executive Officers [Member] | Related Customer [Member] | Service Agreements [Member]
Related Party Transaction [Line Items]
Revenue, related party	200,000	200,000
Accounts receivable, related party	400,000		300,000
Chairman, Board of Directors [Member] | Lease Agreements [Member] | Aircraft [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 700,000	0
Management [Member] | Subcontractor Ancillary Services [Member]
Related Party Transaction [Line Items]
Number of other management employees in subcontracting arrangement | employee	2
Management [Member] | Service Agreements [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 3,100,000	900,000
Accounts payable, related party	1,000,000		2,100,000
Management [Member] | Lease Agreements [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	9,100,000	$ 5,300,000
Accounts payable, related party	$ 800,000		$ 100,000

Related Party Transactions (Spl

Related Party Transactions (Split Dollar Agreements) (Narrative) (Details) - Split Dollar Life Insurance [Member] - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Payments for life insurance policies	$ 0	$ 0
Chairman, Board of Directors [Member]
Related Party Transaction [Line Items]
Payments for life insurance policies	0	$ 0
Executive Officers [Member] | Other Long-Term Assets [Member]
Related Party Transaction [Line Items]
Life insurance assets, carrying amount	$ 13,000,000		$ 13,000,000

Supplemental Guarantor Financ82

Supplemental Guarantor Financial Information (Narrative) (Details)	Mar. 31, 2016
Senior Notes [Member] | 4.875% Senior Notes [Member]
Condensed Unaudited Consolidating Financial Information [Line Items]
Debt instrument, interest rate (percentage)	4.875%

Supplemental Guarantor Financ83

Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue	$ 974,225	$ 1,003,268
Costs of revenue, excluding depreciation and amortization	884,401	886,414
Depreciation and amortization	39,008	42,598
General and administrative expenses	60,048	74,030
Interest expense (income), net	12,158	10,973
Equity in (earnings) losses of unconsolidated affiliates	(3,066)	585
Other (income) expense, net	(13,356)	(592)
Loss before income taxes	(4,968)	(10,740)
Benefit from (provision for) income taxes	2,087	4,352
Net loss (income) before equity in losses from subsidiaries	(2,900)	(6,400)
Equity in losses from subsidiaries, net of tax	0	0
Net loss	(2,881)	(6,388)
Net loss attributable to non-controlling interests	(189)	(125)
Net loss attributable to MasTec, Inc.	(2,692)	(6,263)
Comprehensive (loss) income	(5,267)	(28,416)
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue	0	0
Costs of revenue, excluding depreciation and amortization	0	0
Depreciation and amortization	0	0
General and administrative expenses	600	600
Interest expense (income), net	0	0
Equity in (earnings) losses of unconsolidated affiliates	0	0
Other (income) expense, net	0	0
Loss before income taxes	(600)	(600)
Benefit from (provision for) income taxes	200	200
Net loss (income) before equity in losses from subsidiaries	(400)	(400)
Equity in losses from subsidiaries, net of tax	(2,300)	(5,900)
Net loss	(2,700)	(6,300)
Net loss attributable to non-controlling interests	0	0
Net loss attributable to MasTec, Inc.	(2,700)	(6,300)
Comprehensive (loss) income	(5,100)	(28,300)
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue	878,100	803,000
Costs of revenue, excluding depreciation and amortization	777,200	682,700
Depreciation and amortization	31,300	32,300
General and administrative expenses	50,000	66,200
Interest expense (income), net	27,400	27,100
Equity in (earnings) losses of unconsolidated affiliates	0	0
Other (income) expense, net	(11,300)	(900)
Loss before income taxes	3,400	(4,400)
Benefit from (provision for) income taxes	(1,300)	1,700
Net loss (income) before equity in losses from subsidiaries	2,100	(2,700)
Equity in losses from subsidiaries, net of tax	0	0
Net loss	2,100	(2,700)
Net loss attributable to non-controlling interests	0	0
Net loss attributable to MasTec, Inc.	2,100	(2,700)
Comprehensive (loss) income	2,100	(2,700)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue	96,100	201,700
Costs of revenue, excluding depreciation and amortization	107,200	205,100
Depreciation and amortization	7,700	10,300
General and administrative expenses	9,400	7,200
Interest expense (income), net	(15,200)	(16,100)
Equity in (earnings) losses of unconsolidated affiliates	(3,100)	600
Other (income) expense, net	(2,100)	300
Loss before income taxes	(7,800)	(5,700)
Benefit from (provision for) income taxes	3,200	2,400
Net loss (income) before equity in losses from subsidiaries	(4,600)	(3,300)
Equity in losses from subsidiaries, net of tax	0	0
Net loss	(4,600)	(3,300)
Net loss attributable to non-controlling interests	(200)	(100)
Net loss attributable to MasTec, Inc.	(4,400)	(3,200)
Comprehensive (loss) income	(7,000)	(25,400)
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Operations and Comprehensive Income (Loss) [Line Items]
Revenue	0	(1,400)
Costs of revenue, excluding depreciation and amortization	0	(1,400)
Depreciation and amortization	0	0
General and administrative expenses	0	0
Interest expense (income), net	0	0
Equity in (earnings) losses of unconsolidated affiliates	0	0
Other (income) expense, net	0	0
Loss before income taxes	0	0
Benefit from (provision for) income taxes	0	0
Net loss (income) before equity in losses from subsidiaries	0	0
Equity in losses from subsidiaries, net of tax	2,300	5,900
Net loss	2,300	5,900
Net loss attributable to non-controlling interests	0	0
Net loss attributable to MasTec, Inc.	2,300	5,900
Comprehensive (loss) income	$ 4,700	$ 28,000

Supplemental Guarantor Financ84

Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Current assets	$ 1,198,536	$ 1,129,758
Property and equipment, net	547,957	558,667
Goodwill and other intangible assets, net	1,189,500	1,187,900
Investments in and advances to consolidated affiliates, net	0	0
Other long-term assets	50,657	51,032
Total assets	2,986,628	2,927,347
Liabilities and equity
Total current liabilities	811,662	752,535
Long-term debt	938,722	932,868
Other long-term liabilities	292,300	298,500
Total liabilities	2,042,767	1,983,956
Total equity	943,861	943,391
Total liabilities and equity	2,986,628	2,927,347
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Assets
Current assets	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Investments in and advances to consolidated affiliates, net	931,000	930,300
Other long-term assets	9,300	9,300
Total assets	940,300	939,600
Liabilities and equity
Total current liabilities	0	0
Long-term debt	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Total equity	940,300	939,600
Total liabilities and equity	940,300	939,600
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Assets
Current assets	1,017,800	927,400
Property and equipment, net	437,900	448,200
Goodwill and other intangible assets, net	1,043,400	1,047,400
Investments in and advances to consolidated affiliates, net	78,900	103,700
Other long-term assets	19,600	24,400
Total assets	2,597,600	2,551,100
Liabilities and equity
Total current liabilities	679,000	632,900
Long-term debt	909,300	900,100
Other long-term liabilities	257,400	275,500
Total liabilities	1,845,700	1,808,500
Total equity	751,900	742,500
Total liabilities and equity	2,597,600	2,551,000
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Assets
Current assets	180,700	202,400
Property and equipment, net	110,000	110,500
Goodwill and other intangible assets, net	146,100	140,500
Investments in and advances to consolidated affiliates, net	76,000	50,600
Other long-term assets	21,800	17,300
Total assets	534,600	521,300
Liabilities and equity
Total current liabilities	132,700	119,600
Long-term debt	29,400	32,800
Other long-term liabilities	34,900	23,000
Total liabilities	197,000	175,400
Total equity	337,600	345,900
Total liabilities and equity	534,600	521,300
Eliminations [Member]
Assets
Current assets	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Investments in and advances to consolidated affiliates, net	(1,085,900)	(1,084,600)
Other long-term assets	0	0
Total assets	(1,085,900)	(1,084,600)
Liabilities and equity
Total current liabilities	0	0
Long-term debt	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Total equity	(1,085,900)	(1,084,600)
Total liabilities and equity	$ (1,085,900)	$ (1,084,600)

Supplemental Guarantor Financ85

Supplemental Guarantor Financial Information (Condensed Unaudited Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	$ 15,851	$ 118,826
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired	0	(148)
Capital expenditures	(13,343)	(19,660)
Proceeds from sale of property and equipment	2,237	1,360
Payments for other investments	(1,514)	(31,959)
Net cash used in investing activities	(12,620)	(50,407)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	335,747	439,507
Repayments of credit facilities	(320,742)	(404,776)
Repayments of other borrowings and capital lease obligations	(20,600)	(15,100)
Repurchase of common stock	0	(83,261)
Proceeds from stock-based awards, net of tax withholdings	1,817	925
Excess tax benefit from stock-based compensation	248	0
Net financing activities and advances from (to) consolidated affiliates	0	0
Net cash used in financing activities	(3,648)	(62,830)
Effect of currency translation on cash	(682)	(957)
Net (decrease) increase in cash and cash equivalents	(1,099)	4,632
Cash and cash equivalents - beginning of period	4,984	24,059
Cash and cash equivalents - end of period	3,885	28,691
Reportable Legal Entities [Member] | MasTec, Inc. [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	0	(400)
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired		0
Capital expenditures	0	0
Proceeds from sale of property and equipment	0	0
Payments for other investments	0	0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	0	0
Repayments of credit facilities	0	0
Repayments of other borrowings and capital lease obligations	0	0
Repurchase of common stock		(83,300)
Proceeds from stock-based awards, net of tax withholdings	2,000	1,100
Excess tax benefit from stock-based compensation	0
Net financing activities and advances from (to) consolidated affiliates	(2,000)	82,600
Net cash used in financing activities	0	400
Effect of currency translation on cash	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	(5,300)	175,900
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired		(100)
Capital expenditures	(12,200)	(17,900)
Proceeds from sale of property and equipment	1,500	1,200
Payments for other investments	0	(32,000)
Net cash used in investing activities	(10,700)	(48,800)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	286,800	251,000
Repayments of credit facilities	(270,500)	(224,700)
Repayments of other borrowings and capital lease obligations	(16,300)	(10,700)
Repurchase of common stock		0
Proceeds from stock-based awards, net of tax withholdings	(200)	(200)
Excess tax benefit from stock-based compensation	200
Net financing activities and advances from (to) consolidated affiliates	13,600	(135,700)
Net cash used in financing activities	13,600	(120,300)
Effect of currency translation on cash	0	0
Net (decrease) increase in cash and cash equivalents	(2,500)	6,800
Cash and cash equivalents - beginning of period	4,700	18,500
Cash and cash equivalents - end of period	2,200	25,300
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	21,200	(56,700)
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired		0
Capital expenditures	(1,100)	(1,800)
Proceeds from sale of property and equipment	700	200
Payments for other investments	(1,500)	0
Net cash used in investing activities	(1,900)	(1,600)
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	48,900	188,500
Repayments of credit facilities	(50,200)	(180,100)
Repayments of other borrowings and capital lease obligations	(4,300)	(4,400)
Repurchase of common stock		0
Proceeds from stock-based awards, net of tax withholdings	0	0
Excess tax benefit from stock-based compensation	0
Net financing activities and advances from (to) consolidated affiliates	(11,600)	53,100
Net cash used in financing activities	(17,200)	57,100
Effect of currency translation on cash	(700)	(1,000)
Net (decrease) increase in cash and cash equivalents	1,400	(2,200)
Cash and cash equivalents - beginning of period	300	5,600
Cash and cash equivalents - end of period	1,700	3,400
Eliminations [Member]
Condensed Unaudited Consolidating Statements of Cash Flows [Line Items]
Net cash (used in) provided by operating activities	0	0
Cash flows (used in) provided by investing activities:
Cash paid for acquisitions, net of cash acquired		0
Capital expenditures	0	0
Proceeds from sale of property and equipment	0	0
Payments for other investments	0	0
Net cash used in investing activities	0	0
Cash flows provided by (used in) financing activities:
Proceeds from credit facilities	0	0
Repayments of credit facilities	0	0
Repayments of other borrowings and capital lease obligations	0	0
Repurchase of common stock		0
Proceeds from stock-based awards, net of tax withholdings	0	0
Excess tax benefit from stock-based compensation	0
Net financing activities and advances from (to) consolidated affiliates	0	0
Net cash used in financing activities	0	0
Effect of currency translation on cash	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	$ 0	$ 0