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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Quanta's Goodwill
A summary of changes in Quanta’s goodwill by segment is as follows (in thousands):
Electric Power Infrastructure Solutions
Segment		Renewable Energy Infrastructure Solutions SegmentUnderground Utility and Infrastructure Solutions
Segment		Total
Balance at December 31, 2019:
Goodwill$1,365,163 $— $753,938 $2,119,101 
Accumulated impairment— — (96,426)(96,426)
1,365,163 — 657,512 2,022,675 
Goodwill related to acquisitions completed in 202079,889 — 6,308 86,197 
Purchase price allocation adjustments1,730 — 19 1,749 
Foreign currency translation adjustments 2,992 — 7,401 10,393 
Balance at December 31, 2020:
Goodwill1,449,774— 768,8682,218,642
Accumulated impairment— — (97,628)(97,628)
1,449,774— 671,2402,121,014
Goodwill related to acquisitions completed in 2021100,121 1,299,280 12,066 1,411,467 
Operating company reorganizations(161,912)161,912 — — 
Purchase price allocation adjustments (1,791)— — (1,791)
Foreign currency translation adjustments 1,226 — (3,030)(1,804)
Balance at December 31, 2021:
Goodwill1,387,418 1,461,192 777,136 3,625,746 
Accumulated impairment— — (96,860)(96,860)
$1,387,418 $1,461,192 $680,276 $3,528,886 
Significant Estimates Used by Management in Determining Fair Values of Intangible Assets The following table presents the significant estimates used by management in determining the fair values of Quanta’s reporting units for which a quantitative assessment was performed at December 31, 2021, 2020 and 2019:
 202120202019
Years of cash flows before terminal value5 years5 years5 years
Weighted average cost of capital
12.0%
12.5% to 13.5%
12.5%
Transaction multiple(s) applied to EBITDA
7.0
6.0 to 9.0
6
Guideline public company multiple(s) applied to EBITDA
N/A
N/A
6.5
Five-year revenue compounded annual growth rate(s)
 9% to 26%
-8% to 26%
  -9%
Weighting of three methods:  
Discounted cash flows100%100%70%
Market multiple0%0%15%
Market capitalization0%0%15%
Other Intangible Assets
Quanta’s 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, 2021As of December 31, 2020
Remaining Weighted Average Amortization Period in YearsIntangible
Assets		Accumulated
Amortization		Intangible
Assets, Net		Intangible
Assets		Accumulated
Amortization		Intangible
Assets, Net
Customer relationships6.4$1,738,813 $(379,417)$1,359,396 $616,875 $(277,647)$339,228 
Backlog0.4286,120 (192,140)93,980 149,769 (145,476)4,293 
Trade names14.5357,103 (41,642)315,461 101,533 (32,471)69,062 
Non-compete agreements3.754,022 (41,409)12,613 47,333 (36,973)10,360 
Patented rights, developed technology, and process certifications3.031,520 (23,458)8,062 22,486 (21,894)592 
Curriculum6.413,100 (4,432)8,668 12,233 (3,113)9,120 
Total intangible assets subject to amortization7.42,480,678 (682,498)1,798,180 950,229 (517,574)432,655 
Engineering license3,000 — 3,000 3,000 — 3,000 
Total intangible assets$2,483,678 $(682,498)$1,801,180 $953,229 $(517,574)$435,655 
Estimated Future Aggregate Amortization Expense of Intangible Assets
The estimated future aggregate amortization expense of intangible assets subject to amortization as of December 31, 2021 is set forth below (in thousands):
Year Ending December 31: 
2022$347,276 
2023246,919 
2024233,073 
2025218,532 
2026211,648 
Thereafter540,732 
Total$1,798,180