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Segment Information - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2020 USD ($) division	Dec. 31, 2020 USD ($) Divisions	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			2
Number of internal divisions				2	2
Revenues		$ 11,202,672					$ 12,112,153	$ 11,171,423
Operating income (loss)		611,371					554,874	540,269
Non-US
Segment Reporting Information [Line Items]
Revenues		1,580,000					1,920,000	2,600,000
Property and equipment		336,400	$ 336,400	$ 336,400	$ 336,400	$ 336,400	314,100
Canada
Segment Reporting Information [Line Items]
Revenues		1,252,365					$ 1,436,720	$ 1,984,214
Percentage of foreign revenues						79.00%	75.00%	76.00%
Termination of the Peru Telecommunications Project
Segment Reporting Information [Line Items]
Related charge	$ 79,200
Termination of the Peru Telecommunications Project | Revenues
Segment Reporting Information [Line Items]
Related charge							$ 48,800
Termination of the Peru Telecommunications Project | Cost of Services
Segment Reporting Information [Line Items]
Related charge							30,400
Electric Power Infrastructure Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues		7,773,343					7,121,837	$ 6,415,562
Operating income (loss)		826,325					591,177	628,286
Electric Power Infrastructure Solutions | Operating Segments | Latin America
Segment Reporting Information [Line Items]
Revenues		7,600					63,200	96,100
Operating income (loss)		$ (74,000)					$ (85,700)	$ (8,100)

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