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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | $ 2,119,101 | $ 1,996,362 | $ 1,966,432
Accumulated impairment, beginning balance | (96,426) | (96,483) | (97,832)
Goodwill net, beginning balance | 2,022,675 | 1,899,879 | 1,868,600
Goodwill acquired | 86,197 | 110,383 | 56,337
Purchase price allocation adjustments | 1,749 | 1,503 | 51
Foreign currency translation adjustments | 10,393 | 10,910 | (25,109)
Goodwill gross, ending balance | 2,218,642 | 2,119,101 | 1,996,362
Accumulated impairment, ending balance | (97,628) | (96,426) | (96,483)
Goodwill net, ending balance | 2,121,014 | 2,022,675 | 1,899,879
Electric Power Infrastructure Solutions Division |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | 1,365,163 | 1,313,078 | 1,272,527
Accumulated impairment, beginning balance | 0 | 0 | 0
Goodwill net, beginning balance | 1,365,163 | 1,313,078 | 1,272,527
Goodwill acquired | 79,889 | 43,183 | 56,337
Purchase price allocation adjustments | 1,730 | 1,503 | 51
Foreign currency translation adjustments | 2,992 | 7,399 | (15,837)
Goodwill gross, ending balance | 1,449,774 | 1,365,163 | 1,313,078
Accumulated impairment, ending balance | 0 | 0 | 0
Goodwill net, ending balance | 1,449,774 | 1,365,163 | 1,313,078
Underground Utility and Infrastructure Solutions Division |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | 753,938 | 683,284 | 693,905
Accumulated impairment, beginning balance | (96,426) | (96,483) | (97,832)
Goodwill net, beginning balance | 657,512 | 586,801 | 596,073
Goodwill acquired | 6,308 | 67,200 | 0
Purchase price allocation adjustments | 19 | 0 | 0
Foreign currency translation adjustments | 7,401 | 3,511 | (9,272)
Goodwill gross, ending balance | 768,868 | 753,938 | 683,284
Accumulated impairment, ending balance | (97,628) | (96,426) | (96,483)
Goodwill net, ending balance | $ 671,240 | $ 657,512 | $ 586,801

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