Business and Organization	12 Months Ended
Business and Organization	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Organization	BUSINESS AND ORGANIZATION: Quanta Services, Inc., (together with its subsidiaries, Quanta), is a leading provider of specialty contracting services, delivering comprehensive infrastructure solutions for the electric and gas utility, renewable energy, communications, pipeline and energy industries in the United States, Canada, Australia and select other international markets. Beginning with the three months ended December 31, 2021, Quanta reports its results under three reportable segments: (1) Electric Power Infrastructure Solutions, (2) Renewable Energy Infrastructure Solutions and (3) Underground Utility and Infrastructure Solutions. The Renewable Energy Infrastructure Solutions segment was added primarily due to the acquisition of Blattner Holding Company and its operating subsidiaries (collectively, Blattner) as described below. In conjunction with this change, certain prior period amounts have been recast to conform to this new segment reporting structure. On October 13, 2021, Quanta completed the acquisition of Blattner. Blattner is a large and leading utility-scale renewable energy infrastructure solutions provider that is located and primarily operates in North America. For additional information regarding this acquisition, see Note 6. Blattner provides comprehensive solutions to customers in the renewable energy industry, which generally include front-end engineering, procurement, project management and construction services for wind, solar and energy storage projects. Blattner’s results of operations have been included in Quanta’s consolidated financial statements since the acquisition date. Electric Power Infrastructure Solutions Segment The Electric Power Infrastructure Solutions segment provides comprehensive network solutions to customers in the electric power and other industries. Services include design, procurement, new construction, upgrade and repair and maintenance for electric power transmission and distribution infrastructure, both overhead and underground, and substation facilities, along with other engineering and technical services. This includes solutions that support the implementation of upgrades by utilities to modernize and harden the electric power grid in order to ensure its safety and enhance reliability. In addition, this segment provides emergency restoration services, including the repair of infrastructure damaged by fire and inclement weather; the energized installation, maintenance and upgrade of electric power infrastructure utilizing bare hand and hot stick methods and Quanta’s robotic arm techniques; and the installation of “smart grid” technologies on electric power networks. This segment also provides comprehensive design and construction solutions to wireline and wireless communications companies, cable multi-system operators and other customers within the communications industry, including services in connection with 5G wireless deployment; and the design, installation, maintenance and repair services related to commercial and industrial wiring. Additionally, this segment provides aviation services primarily for the utility industry, including the transportation of line workers, the setting of poles and towers and the stringing of wires. The majority of the financial results of Quanta’s postsecondary educational institution, which specializes in pre-apprenticeship training, apprenticeship training and specialized utility task training for electric workers, as well as training for the gas distribution and communications industries, are also included in the segment. Renewable Energy Infrastructure Solutions Segment The Renewable Energy Infrastructure Solutions segment provides comprehensive infrastructure solutions to customers involved in the renewable energy industry. Services include engineering, procurement, new construction and repair and maintenance for renewable generation facilities, such as utility-scale wind, solar, and hydropower generation facilities and battery storage facilities, as well as engineering and construction services for substations and switchyards, transmission and other electrical infrastructure needed to interconnect and transmit renewable energy generation and battery storage facilities. Underground Utility and Infrastructure Solutions Segment The Underground Utility and Infrastructure Solutions segment provides comprehensive infrastructure solutions for customers involved in the development, transportation, distribution, storage and processing of natural gas, oil and other products. Services include design, engineering, procurement, new construction, upgrade and repair and maintenance for natural gas systems for gas utility customers, as well as pipeline protection, integrity testing, rehabilitation and replacement services. Quanta also provides catalyst replacement services, high-pressure and critical-path turnaround services, instrumentation and electrical services, piping, fabrication and storage tank services for the midstream and downstream industrial energy markets. This segment also provides engineering and construction services for pipeline systems, storage systems and compressor and pump stations and the fabrication of pipeline support systems and related structures and facilities, as well as trenching, directional boring and mechanized welding services related to the services described above and in connection with our electric power infrastructure services. This segment also provides engineering, construction and maintenance services for energy transition and carbon-reduction related projects, such as alternative fuel facilities, carbon capture systems and hydrogen facilities.