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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 3,020,161	$ 3,352,895	$ 8,290,487	$ 8,999,353
Operating income (loss)	242,215	209,394	435,868	407,461
Depreciation	56,244	55,562	165,180	161,589
Corporate and Non-Allocated Costs
Segment Reporting Information [Line Items]
Operating income (loss)	(102,381)	(98,722)	(273,909)	(265,849)
Depreciation	4,294	5,445	12,563	14,218
Electric Power Infrastructure Services | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,107,621	1,876,097	5,667,566	5,274,456
Operating income (loss)	268,376	175,692	581,030	430,244
Depreciation	30,637	27,240	88,337	79,205
Pipeline and Industrial Infrastructure Services Division | Operating Segments
Segment Reporting Information [Line Items]
Revenues	912,540	1,476,798	2,622,921	3,724,897
Operating income (loss)	76,220	132,424	128,747	243,066
Depreciation	$ 21,313	$ 22,877	$ 64,280	$ 68,166

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