Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Details)

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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]      
Goodwill gross, beginning balance $ 2,218,642   $ 2,119,101
Accumulated impairment, beginning balance (97,628)   (96,426)
Goodwill, beginning balance 2,121,014   2,022,675
Goodwill acquired 1,780 $ 75,800 86,197
Purchase price allocation adjustments (1,264)   1,749
Foreign currency translation adjustments 2,559   10,393
Goodwill gross, ending balance 2,221,546 2,221,546 2,218,642
Accumulated impairment, ending balance (97,457) (97,457) (97,628)
Goodwill, ending balance 2,124,089 2,124,089 2,121,014
Electric Power Infrastructure Solutions Division      
Goodwill [Roll Forward]      
Goodwill gross, beginning balance 1,449,774   1,365,163
Accumulated impairment, beginning balance 0   0
Goodwill, beginning balance 1,449,774   1,365,163
Goodwill acquired 1,780   79,889
Purchase price allocation adjustments (1,264)   1,730
Foreign currency translation adjustments 2,239   2,992
Goodwill gross, ending balance 1,452,529 1,452,529 1,449,774
Accumulated impairment, ending balance 0 0 0
Goodwill, ending balance 1,452,529 1,452,529 1,449,774
Underground Utility and Infrastructure Solutions Division      
Goodwill [Roll Forward]      
Goodwill gross, beginning balance 768,868   753,938
Accumulated impairment, beginning balance (97,628)   (96,426)
Goodwill, beginning balance 671,240   657,512
Goodwill acquired 0   6,308
Purchase price allocation adjustments 0   19
Foreign currency translation adjustments 320   7,401
Goodwill gross, ending balance 769,017 769,017 768,868
Accumulated impairment, ending balance (97,457) (97,457) (97,628)
Goodwill, ending balance $ 671,560 $ 671,560 $ 671,240