Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

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, 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 related to acquisitions completed in 2018	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

Goodwill related to acquisitions completed in 2019	32,143			65,200			97,343
Purchase price allocation adjustments	1,503			—			1,503
Foreign currency translation adjustments	3,207			977			4,184

Balance at September 30, 2019:
Goodwill	1,349,931			748,927			2,098,858
Accumulated impairment	—			(95,949		)	(95,949		)
	$	1,349,931		$	652,978		$	2,002,909

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
	September 30, 2019							December 31, 2018							September 30, 2019
	Intangible Assets		Accumulated Amortization			Intangible Assets, Net		Intangible Assets		Accumulated Amortization			Intangible Assets, Net		Remaining Weighted Average Amortization Period in Years
Customer relationships	$	531,813	$	(197,646	)	$	334,167	$	359,967	$	(165,715	)	$	194,252	6.7
Backlog	140,984		(137,454		)	3,530		135,578		(134,592		)	986		0.3
Trade names	93,021		(25,379		)	67,642		81,058		(21,559		)	59,499		14.9
Non-compete agreements	43,157		(31,754		)	11,403		40,728		(30,168		)	10,560		3.4
Patented rights and developed technology	22,511		(20,297		)	2,214		22,482		(19,175		)	3,307		2.3
Curriculum	11,230		(1,623		)	9,607		9,448		(872		)	8,576		8.6
Total intangible assets subject to amortization	842,716		(414,153		)	428,563		649,261		(372,081		)	277,180		7.8
Engineering license	3,000		—			3,000		3,000		—			3,000
Total intangible assets	$	845,716	$	(414,153	)	$	431,563	$	652,261	$	(372,081	)	$	280,180

Estimated Future Aggregate Amortization Expense of Intangible Assets

The estimated future aggregate amortization expense of intangible assets subject to amortization as of September 30, 2019 is set forth below (in thousands):



Year Ending December 31:
Remainder of 2019	$	21,654
2020	68,933
2021	66,327
2022	62,555
2023	54,316
Thereafter	154,778
Total	$	428,563