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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill gross, beginning balance	$ 2,119,101		$ 1,996,362
Accumulated impairment, beginning balance	(96,426)		(96,483)
Goodwill, beginning balance	2,022,675		1,899,879
Goodwill acquired	10,069	$ 102,700	110,383
Purchase price allocation adjustments	1,790		1,503
Foreign currency translation adjustments	(11,539)		10,910
Goodwill gross, ending balance	2,119,216	2,119,216	2,119,101
Accumulated impairment, ending balance	(96,221)	(96,221)	(96,426)
Goodwill, ending balance	2,022,995	2,022,995	2,022,675
Electric Power Infrastructure Services Division
Goodwill [Roll Forward]
Goodwill gross, beginning balance	1,365,163		1,313,078
Accumulated impairment, beginning balance	0		0
Goodwill, beginning balance	1,365,163		1,313,078
Goodwill acquired	3,768		43,183
Purchase price allocation adjustments	1,771		1,503
Foreign currency translation adjustments	(7,532)		7,399
Goodwill gross, ending balance	1,363,170	1,363,170	1,365,163
Accumulated impairment, ending balance	0	0	0
Goodwill, ending balance	1,363,170	1,363,170	1,365,163
Pipeline and Industrial Infrastructure Services Division
Goodwill [Roll Forward]
Goodwill gross, beginning balance	753,938		683,284
Accumulated impairment, beginning balance	(96,426)		(96,483)
Goodwill, beginning balance	657,512		586,801
Goodwill acquired	6,301		67,200
Purchase price allocation adjustments	19		0
Foreign currency translation adjustments	(4,007)		3,511
Goodwill gross, ending balance	756,046	756,046	753,938
Accumulated impairment, ending balance	(96,221)	(96,221)	(96,426)
Goodwill, ending balance	$ 659,825	$ 659,825	$ 657,512

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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