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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill gross, beginning balance		$ 1,966,432	$ 1,642,902	$ 1,592,551
Accumulated impairment, beginning balance		(97,832)	(39,733)	(39,893)
Goodwill net, beginning balance		1,868,600	1,603,169	1,552,658
Goodwill acquired		56,337	302,408	45,186
Purchase price allocation adjustments		51	(1,278)	15
Goodwill impairment	$ (57,000)		(57,011)
Foreign currency translation adjustments		(25,109)	21,312	5,310
Goodwill gross, ending balance	1,966,432	1,996,362	1,966,432	1,642,902
Accumulated impairment, ending balance	(97,832)	(96,483)	(97,832)	(39,733)
Goodwill net, ending balance	1,868,600	1,899,879	1,868,600	1,603,169
Electric Power Infrastructure Services Division
Goodwill [Roll Forward]
Goodwill gross, beginning balance		1,272,527	1,253,979	1,226,245
Accumulated impairment, beginning balance		0	0	0
Goodwill net, beginning balance		1,272,527	1,253,979	1,226,245
Goodwill acquired		56,337	5,866	24,168
Purchase price allocation adjustments		51	(619)	229
Goodwill impairment			0
Foreign currency translation adjustments		(15,837)	13,301	3,337
Goodwill gross, ending balance	1,272,527	1,313,078	1,272,527	1,253,979
Accumulated impairment, ending balance	0	0	0	0
Goodwill net, ending balance	1,272,527	1,313,078	1,272,527	1,253,979
Pipeline and Industrial Infrastructure Services Division
Goodwill [Roll Forward]
Goodwill gross, beginning balance		693,905	388,923	366,306
Accumulated impairment, beginning balance		(97,832)	(39,733)	(39,893)
Goodwill net, beginning balance		596,073	349,190	326,413
Goodwill acquired		0	296,542	21,018
Purchase price allocation adjustments		0	(659)	(214)
Goodwill impairment			(57,011)
Foreign currency translation adjustments		(9,272)	8,011	1,973
Goodwill gross, ending balance	693,905	683,284	693,905	388,923
Accumulated impairment, ending balance	(97,832)	(96,483)	(97,832)	(39,733)
Goodwill net, ending balance	$ 596,073	$ 586,801	$ 596,073	$ 349,190

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