Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions MasTec purchases, rents and leases equipment and purchases various types of supplies and services used in its business, including ancillary construction services, project-related site restoration and marketing and business development activities, from a number of different vendors on a non-exclusive basis, and from time to time, rents equipment to, sells certain supplies, or performs construction services on behalf of, entities in which members of subsidiary management have ownership or commercial interests. For the years ended December 31, 2021, 2020 and 2019, such payments to related party entities totaled approximately $81.2 million, $80.9 million and $108.0 million, respectively. Payables associated with such arrangements totaled approximately $0.6 million and $8.9 million as of December 31, 2021 and 2020, respectively. Revenue from such related party arrangements totaled approximately $4.2 million, $4.1 million and $2.3 million for the years ended December 31, 2021, 2020 and 2019, respectively. Related amounts receivable, net, totaled approximately $0.4 million and $0.5 million as of December 31, 2021 and 2020, respectively. The Company rents and leases equipment and purchases certain supplies and servicing from CCI. 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 CCI, and a member of management of a MasTec subsidiary and an entity that is owned by the Mas family are minority owners. MasTec paid CCI $23.2 million, $6.8 million and $41.7 million, net of rebates for the years ended December 31, 2021, 2020 and 2019, respectively, related to this activity. Amounts payable to CCI, net of rebates receivable, totaled approximately $0.8 million and $4.2 million as of December 31, 2021 and 2020, respectively. The Company has also rented equipment to CCI. Revenue from equipment rentals to CCI totaled approximately $0.1 million and $0.9 million for the years ended December 31, 2021 and 2020, respectively. There were no related receivables as of December 31, 2021, and as of December 31, 2020, related receivables were de minimis. MasTec has a subcontracting arrangement with an entity for the performance of construction services, the minority owners of which include an entity controlled by Jorge Mas and José R. Mas, along with two members of management of a MasTec subsidiary. For the years ended December 31, 2021, 2020 and 2019, MasTec incurred subcontracting expenses of approximately $90.3 million, $1.9 million and $10.3 million, respectively, under these arrangements. As of December 31, 2021 and 2020, related amounts payable totaled approximately $0.5 million and $1.4 million, respectively. MasTec has a leasing arrangement for an aircraft that is owned by an entity that Jorge Mas owns. MasTec paid approximately $2.6 million for both the years ended December 31, 2021 and 2020 related to this leasing arrangement, and for the year ended December 31, 2019, paid approximately $2.4 million. MasTec performs construction services on behalf of a professional Miami soccer franchise (the “Franchise”) in which Jorge Mas and José R. Mas are minority owners. Services provided by MasTec have included the construction of a soccer facility and stadium as well as wireless infrastructure services. For the year ended December 31, 2021, charges under these arrangements were de minimis, and for the years ended December 31, 2020 and 2019, MasTec charged approximately $7.1 million and $12.6 million, respectively. Related amounts outstanding as of December 31, 2021 and 2020, were de minimis. Payments for other expenses related to the Franchise totaled $0.6 million and $0.3 million for the years ended December 31, 2021 and 2020, respectively, for which there were no amounts outstanding as of either December 31, 2021 or 2020. MasTec leases employees and provides satellite communication services to a customer in which Jorge Mas and José R. Mas own a majority interest. Charges to this customer under these arrangements totaled approximately $1.2 million, $1.3 million and $1.4 million for the years ended December 31, 2021, 2020 and 2019, respectively. As of December 31, 2021 and 2020, related amounts receivable totaled approximately $0.8 million and $0.9 million, respectively. In connection with one of its 2021 acquisitions, the Company advanced approximately $1.0 million to the former owner of the acquired business, which amount is outstanding as of December 31, 2021. Additionally, a separate 2021 acquisition has investments in certain entities, each of which is 49% owned by the Company, and is accounted for as an equity method investment. The Company has line of credit arrangements with these investees, providing for up to $8.5 million of borrowing availability, of which $0.4 million was drawn as of December 31, 2021, which amount is included within other current assets. In 2018, the Company acquired a construction management firm specializing in steel building systems, of which Juan Carlos Mas was a minority owner at the time of acquisition. During the third quarter of 2021, certain provisions relating to contingent consideration within the purchase agreement were clarified, for which the net impact is expected to be insignificant. For the year ended December 31, 2021, the Company paid $0.8 million of contingent consideration related to this agreement. The Company, through a 2020 acquisition, has a 25% interest in an entity, under which the acquired business and the 25% owned entity have a subcontracting arrangement. The Company’s interest in this entity, for which post acquisition operating activity is de minimis, is accounted for as an equity method investment. As of December 31, 2021 and 2020, the Company’s net investment in this entity was a liability of approximately $1.6 million and $2.0 million, respectively, which net amount includes approximately $2.3 million and $1.9 million, respectively, of accounts receivable, net, less deferred revenue, related to the subcontracting arrangement. Additionally, the Company has certain arrangements with an entity in which members of management have an ownership interest, including a fee arrangement in conjunction with a $15.0 million letter of credit issued by the Company on behalf of this entity. For the years ended December 31, 2021 and 2020, approximately $0.8 million and $0.9 million, respectively, of income and recovery of costs was recognized in connection with these arrangements, and as of both December 31, 2021 and 2020, related amounts receivable totaled $0.4 million. In addition, for the year ended December 31, 2020, the Company advanced $1.2 million on behalf of this entity, which amount was collected as of December 31, 2020. One of the Company’s subsidiaries has a subcontracting arrangement with a contractual joint venture in which it holds a 35% undivided interest, for which the related project was complete as of December 31, 2021. Outstanding performance guarantees on behalf of this contractual joint venture totaled Canadian $9.7 million and $26.4 million as of December 31, 2021 and 2020, respectively, or approximately $7.7 million and $20.7 million, respectively. Non-controlling interests in entities consolidated by the Company represent ownership interests held by members of management of certain of the Company’s subsidiaries, primarily in the Company’s Oil and Gas segment. In 2021, the Company acquired an additional 15% of the non-controlling interests in one of these entities from two members of subsidiary management for $6.8 million in cash. Split Dollar Agreements MasTec has an amended and restated split dollar life insurance agreement with (i) Jorge Mas, and José R. Mas and Juan Carlos Mas, as trustees of the Jorge Mas Irrevocable Trust (the “Jorge Mas trust”); and (ii) José R. Mas, and Jorge Mas, Juan Carlos Mas and Patricia Mas, as trustees of the José Ramon Mas Irrevocable Trust (the “José R. Mas trust”). The Company is the sole owner of each of the policies and is designated as the named fiduciary under each split dollar agreement, and the policies subject to the split dollar agreement may not be surrendered without the express written consent of the applicable trust. The total maximum face amount of the insurance policies subject to the split dollar agreements is capped at $200 million in the case of Jorge Mas and $75 million in the case of José R. Mas. Upon the death of the applicable executive or the survivor of the applicable executive and his wife, the Company is entitled to receive a portion of the death benefit under the policy equal to the greater of (i) premiums paid by the Company on the policy and (ii) the then cash value of the policy (excluding surrender charges or other similar charges or reductions) immediately before the triggering death. In addition, each executive is entitled to purchase the applicable policy under certain events, including a change in control of the Company. The Company paid approximately $1.1 million in each of the years ended December 31, 2021, 2020 and 2019 in connection with the split dollar agreements for Jorge Mas, and paid approximately $0.7 million in each of the years ended December 31, 2021, 2020 and 2019 in connection with the split dollar agreements for José R. Mas. Life insurance assets associated with these agreements, which amounts are included within other long-term assets, totaled approximately $24.0 million and $22.2 million as of December 31, 2021 and 2020, respectively.