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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | $ 2,119,101 |  | $ 1,996,362
Accumulated impairment, beginning balance | (96,426) |  | (96,483)
Goodwill, beginning balance | 2,022,675 |  | 1,899,879
Goodwill acquired | 78,125 | $ 89,100 | 110,383
Purchase price allocation adjustments | 1,750 |  | 1,503
Foreign currency translation adjustments | (4,905) |  | 10,910
Goodwill gross, ending balance | 2,194,327 | 2,194,327 | 2,119,101
Accumulated impairment, ending balance | (96,682) | (96,682) | (96,426)
Goodwill, ending balance | 2,097,645 | 2,097,645 | 2,022,675
Electric Power Infrastructure Services Division |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | 1,365,163 |  | 1,313,078
Accumulated impairment, beginning balance | 0 |  | 0
Goodwill, beginning balance | 1,365,163 |  | 1,313,078
Goodwill acquired | 71,817 |  | 43,183
Purchase price allocation adjustments | 1,731 |  | 1,503
Foreign currency translation adjustments | (4,160) |  | 7,399
Goodwill gross, ending balance | 1,434,551 | 1,434,551 | 1,365,163
Accumulated impairment, ending balance | 0 | 0 | 0
Goodwill, ending balance | 1,434,551 | 1,434,551 | 1,365,163
Pipeline and Industrial Infrastructure Services Division |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | 753,938 |  | 683,284
Accumulated impairment, beginning balance | (96,426) |  | (96,483)
Goodwill, beginning balance | 657,512 |  | 586,801
Goodwill acquired | 6,308 |  | 67,200
Purchase price allocation adjustments | 19 |  | 0
Foreign currency translation adjustments | (745) |  | 3,511
Goodwill gross, ending balance | 759,776 | 759,776 | 753,938
Accumulated impairment, ending balance | (96,682) | (96,682) | (96,426)
Goodwill, ending balance | $ 663,094 | $ 663,094 | $ 657,512

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