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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill gross, beginning balance	$ 2,119,101	$ 1,996,362	$ 1,966,432
Accumulated impairment, beginning balance	(96,426)	(96,483)	(97,832)
Goodwill net, beginning balance	2,022,675	1,899,879	1,868,600
Goodwill acquired	86,197	110,383	56,337
Purchase price allocation adjustments	1,749	1,503	51
Foreign currency translation adjustments	10,393	10,910	(25,109)
Goodwill gross, ending balance	2,218,642	2,119,101	1,996,362
Accumulated impairment, ending balance	(97,628)	(96,426)	(96,483)
Goodwill net, ending balance	2,121,014	2,022,675	1,899,879
Electric Power Infrastructure Solutions Division
Goodwill [Roll Forward]
Goodwill gross, beginning balance	1,365,163	1,313,078	1,272,527
Accumulated impairment, beginning balance	0	0	0
Goodwill net, beginning balance	1,365,163	1,313,078	1,272,527
Goodwill acquired	79,889	43,183	56,337
Purchase price allocation adjustments	1,730	1,503	51
Foreign currency translation adjustments	2,992	7,399	(15,837)
Goodwill gross, ending balance	1,449,774	1,365,163	1,313,078
Accumulated impairment, ending balance	0	0	0
Goodwill net, ending balance	1,449,774	1,365,163	1,313,078
Underground Utility and Infrastructure Solutions Division
Goodwill [Roll Forward]
Goodwill gross, beginning balance	753,938	683,284	693,905
Accumulated impairment, beginning balance	(96,426)	(96,483)	(97,832)
Goodwill net, beginning balance	657,512	586,801	596,073
Goodwill acquired	6,308	67,200	0
Purchase price allocation adjustments	19	0	0
Foreign currency translation adjustments	7,401	3,511	(9,272)
Goodwill gross, ending balance	768,868	753,938	683,284
Accumulated impairment, ending balance	(97,628)	(96,426)	(96,483)
Goodwill net, ending balance	$ 671,240	$ 657,512	$ 586,801

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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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-SubTopic 210
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