Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

A summary of changes in Quanta’s goodwill is as follows (in thousands):


	Electric Power Infrastructure Services Division			Oil and Gas Infrastructure Services Division			Total
Goodwill balance at December 31, 2013	$	1,168,084		$	277,843		$	1,445,927
Goodwill acquired during 2014		71,517			102,968			174,485
Foreign currency translation adjustments		(16,377	)		(7,340	)		(23,717	)

Goodwill balance at December 31, 2014		1,223,224			373,471			1,596,695
Goodwill acquired during 2015		31,224			20,636			51,860
Purchase price allocation adjustments		750			(8,867	)		(8,117	)
Goodwill impaired during 2015		—			(39,826	)		(39,826	)
Foreign currency translation adjustments		(28,953	)		(19,001	)		(47,954	)


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

Other Intangible Assets

Quanta’s intangible assets subject to amortization and the remaining weighted average amortization periods related to such assets were as follows (in thousands except for weighted average amortization periods, which are in years):


	As of December 31, 2015							As of December 31, 2014							As of December 31, 2015
	As of December 31, 2015							As of December 31, 2014							As of December 31, 2015
	Intangible Assets		Accumulated Amortization			Intangible Assets, Net		Intangible Assets		Accumulated Amortization			Intangible Assets, Net		Remaining Weighted Average Amortization Period in Years
Customer relationships	$	236,731	$	(90,840	)	$	145,891	$	235,851	$	(63,764	)	$	172,087		9.7
Backlog		130,818		(126,954	)		3,864		133,704		(122,265	)		11,439		0.7
Trade names		51,192		(9,525	)		41,667		49,664		(6,278	)		43,386		18.6
Non-compete agreements		28,560		(23,507	)		5,053		27,659		(21,365	)		6,294		3.5
Patented rights and developed technology		22,447		(13,848	)		8,599		22,073		(11,695	)		10,378		4.0

Total intangible assets subject to amortization	$	469,748	$	(264,674	)	$	205,074	$	468,951	$	(225,367	)	$	243,584		10.9

Estimated Future Aggregate Amortization Expense of Intangible Assets

The estimated future aggregate amortization expense of intangible assets subject to amortization as of December 31, 2015 is set forth below (in thousands):


For the Fiscal Year Ending December 31,
2016	$	28,172
2017		22,758
2018		22,015
2019		21,219
2020		20,103
Thereafter		90,807

Total	$	205,074