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Segment Information - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) division Segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Number of internal divisions | division			2
Revenues	$ 3,020,161	$ 3,352,895	$ 8,290,487	$ 8,999,353
Operating income (loss)	242,215	209,394	435,868	407,461
Canada
Segment Reporting Information [Line Items]
Revenues	$ 320,576	$ 342,016	$ 917,621	$ 1,029,667
Percentage of foreign revenues	82.00%	71.00%	77.00%	75.00%
Foreign Countries
Segment Reporting Information [Line Items]
Revenues	$ 390,600	$ 480,000	$ 1,180,000	$ 1,360,000
Property and equipment	307,500		307,500		$ 314,100
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
Electric Power Infrastructure Services | Operating Segments | Latin America
Segment Reporting Information [Line Items]
Revenues	500	28,200	7,600	35,200
Operating income (loss)	$ (15,400)	$ (2,200)	$ (46,900)	(82,200)
Electric Power Infrastructure Services | Operating Segments | Latin America | Telecommunications [Member]
Segment Reporting Information [Line Items]
Revenues				$ (48,800)

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