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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Quanta's Goodwill A summary of changes in Quanta’s goodwill is as follows (in thousands):
 
 
Electric Power Infrastructure Services
Division
 
Pipeline and Industrial Infrastructure Services
Division
 
Total
Balance at December 31, 2015:
 
 
 
 
 
 
Goodwill
 
$
1,226,245

 
$
366,306

 
$
1,592,551

Accumulated impairment
 
—

 
(39,893
)
 
(39,893
)
 
 
$
1,226,245

 
$
326,413

 
1,552,658

 
 
 
 
 
 
 
Goodwill recorded related to 2016 acquisitions
 
24,168

 
21,018

 
45,186

Purchase price allocation adjustments
 
229

 
(214
)
 
15

Foreign currency translation adjustments
 
3,337

 
1,973

 
5,310

 
 
 
 
 
 
 
Balance at December 31, 2016:
 
 
 
 
 
 
Goodwill
 
1,253,979

 
388,923

 
1,642,902

Accumulated impairment
 
—

 
(39,733
)
 
(39,733
)
 
 
1,253,979

 
349,190

 
1,603,169

 
 
 
 
 
 
 
Goodwill recorded related to 2017 acquisitions
 
5,866

 
296,542

 
302,408

Purchase price allocation adjustments
 
(619
)
 
(659
)
 
(1,278
)
Goodwill impaired during 2017
 
—

 
(57,011
)
 
(57,011
)
Foreign currency translation adjustments
 
13,301

 
8,011

 
21,312

 
 
 
 
 
 
 
Balance at December 31, 2017:
 
 
 
 
 
 
Goodwill
 
1,272,527
 
693,905
 
1,966,432
Accumulated impairment
 
—

 
(97,832
)
 
(97,832
)
 
 
1,272,527
 
596,073
 
1,868,600
 
 
 
 
 
 
 
Goodwill recorded related to 2018 acquisitions
 
56,337

 
—

 
56,337

Purchase price allocation adjustments
 
51

 
—

 
51

Foreign currency translation adjustments
 
(15,837
)
 
(9,272
)
 
(25,109
)
 
 
 
 
 
 
 
Balance at December 31, 2018:
 
 
 
 
 
 
Goodwill
 
1,313,078

 
683,284

 
1,996,362

Accumulated impairment
 
—

 
(96,483
)
 
(96,483
)
 
 
$
1,313,078

 
$
586,801

 
$
1,899,879
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
 
 
As of
 
As of
 
December 31,
 
 
December 31, 2018
 
December 31, 2017
 
2018
 
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Intangible
Assets
 
Accumulated
Amortization
 
Intangible
Assets, Net
 
Remaining Weighted Average Amortization Period in Years
Customer relationships
 
$
359,967

 
$
(165,715
)
 
$
194,252

 
$
327,334

 
$
(137,333
)
 
$
190,001

 
6.2
Backlog
 
135,578

 
(134,592
)
 
986

 
136,266

 
(135,847
)
 
419

 
0.7
Trade names
 
81,058

 
(21,559
)
 
59,499

 
74,797

 
(17,057
)
 
57,740

 
15.4
Non-compete agreements
 
40,728

 
(30,168
)
 
10,560

 
37,760

 
(27,659
)
 
10,101

 
3.6
Patented rights and developed technology
 
22,482

 
(19,175
)
 
3,307

 
22,529

 
(17,611
)
 
4,918

 
2.7
Curriculum
 
9,448

 
(872
)
 
8,576

 
—

 
—

 
—

 
9.1
Total intangible assets subject to amortization
 
649,261

 
(372,081
)
 
277,180

 
598,686

 
(335,507
)
 
263,179

 
8.0
Engineering license
 
3,000

 
—

 
3,000

 
—

 
—

 
—

 
 
Total intangible assets
 
$
652,261

 
$
(372,081
)
 
$
280,180

 
$
598,686

 
$
(335,507
)
 
$
263,179

 
 
Estimated Future Aggregate Amortization Expense of Intangible Assets The estimated future aggregate amortization expense of intangible assets subject to amortization as of December 31, 2018 is set forth below (in thousands):
Year Ending December 31:
 
 
2019
 
$
47,135

2020
 
44,980

2021
 
42,657

2022
 
39,129

2023
 
31,323

Thereafter
 
71,956

Total
 
$
277,180