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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, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | $ 1,996,362 |  | $ 1,966,432
Accumulated impairment, beginning balance | (96,483) |  | (97,832)
Goodwill, beginning balance | 1,899,879 |  | 1,868,600
Goodwill acquired | 21,909 | $ 34,300 | 56,337
Purchase price allocation adjustments |  |  | 51
Foreign currency translation adjustments | 5,240 |  | (25,109)
Goodwill gross, ending balance | 2,023,594 | 2,023,594 | 1,996,362
Accumulated impairment, ending balance | (96,566) | (96,566) | (96,483)
Goodwill, ending balance | 1,927,028 | 1,927,028 | 1,899,879
Electric Power Infrastructure Services Division |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | 1,313,078 |  | 1,272,527
Accumulated impairment, beginning balance | 0 |  | 0
Goodwill, beginning balance | 1,313,078 |  | 1,272,527
Goodwill acquired | 21,909 |  | 56,337
Purchase price allocation adjustments |  |  | 51
Foreign currency translation adjustments | 3,470 |  | (15,837)
Goodwill gross, ending balance | 1,338,457 | 1,338,457 | 1,313,078
Accumulated impairment, ending balance | 0 | 0 | 0
Goodwill, ending balance | 1,338,457 | 1,338,457 | 1,313,078
Pipeline and Industrial Infrastructure Services Division |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill gross, beginning balance | 683,284 |  | 693,905
Accumulated impairment, beginning balance | (96,483) |  | (97,832)
Goodwill, beginning balance | 586,801 |  | 596,073
Goodwill acquired | 0 |  | 0
Purchase price allocation adjustments |  |  | 0
Foreign currency translation adjustments | 1,770 |  | (9,272)
Goodwill gross, ending balance | 685,137 | 685,137 | 683,284
Accumulated impairment, ending balance | (96,566) | (96,566) | (96,483)
Goodwill, ending balance | $ 588,571 | $ 588,571 | $ 586,801

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