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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Quanta's Goodwill
The changes in the carrying amount of goodwill of each of Quanta’s reportable segments were as follows (in thousands):
Electric
Segment
Underground and Infrastructure
Segment
Total
Balance at December 31, 2023 (1)
$3,371,687 $674,218 $4,045,905 
Goodwill related to acquisition completed in 20241,126,121 186,993 1,313,114 
Purchase price allocation adjustments(10,996)— (10,996)
Goodwill written off due to sale of business (1)
— (6,147)(6,147)
Foreign currency translation adjustments(13,725)(11,708)(25,433)
Balance at December 31, 2024 (1)
4,473,087843,3565,316,443
Goodwill related to the acquisitions completed in 2025645,725 1,332,171 1,977,896 
Purchase price allocation adjustments5,933 364 6,297 
Foreign currency translation adjustments8,951 7,641 16,592 
Balance at December 31, 2025 (1)
$5,133,696 $2,183,532 $7,317,228 
(1)    Included in the Underground and Infrastructure segment for the years ended December 31, 2025, 2024, and 2023 was accumulated impairment of $50.7 million, $49.9 million and $96.1 million. During the year ended December 31, 2024, $45.1 million of accumulated impairment was written off related to the Underground and Infrastructure segment due to the sale of a business.
Other Intangible Assets
Quanta’s identifiable intangible assets and the remaining weighted average amortization periods related to its intangible assets subject to amortization were as follows (in thousands except for weighted average amortization periods, which are in years):
As of December 31, 2025As of December 31, 2024
Remaining Weighted Average Amortization Period in YearsIntangible
Assets		Accumulated
Amortization		Intangible
Assets, Net		Intangible
Assets		Accumulated
Amortization		Intangible
Assets, Net
Customer relationships5.7$3,523,939 $(1,464,107)$2,059,832 $2,405,606 $(1,105,099)$1,300,507 
Backlog1.6618,911 (454,847)164,064 442,459 (358,596)83,863 
Trade names12.9794,379 (156,085)638,294 569,307 (113,970)455,337 
Non-compete agreements4.591,781 (57,513)34,268 61,589 (51,453)10,136 
Patented rights, developed technology, process certifications and other12.535,413 (33,140)2,273 35,317 (32,763)2,554 
Curriculum3.216,691 (12,234)4,457 15,618 (10,478)5,140 
Total intangible assets subject to amortization7.15,081,114 (2,177,926)2,903,188 3,529,896 (1,672,359)1,857,537 
Engineering license3,000 — 3,000 3,000 — 3,000 
Other intangible assets, net$5,084,114 $(2,177,926)$2,906,188 $3,532,896 $(1,672,359)$1,860,537 
Estimated Future Aggregate Amortization Expense of Intangible Assets
The estimated future aggregate amortization expense of intangible assets subject to amortization as of December 31, 2025 is set forth below (in thousands):
Year Ending December 31: 
2026$623,128 
2027541,168 
2028429,002 
2029274,067 
2030260,335 
Thereafter775,488 
Total$2,903,188