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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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