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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 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 | $ 35,800 | 56,337
Purchase price allocation adjustments | 1,503 |  | 51
Foreign currency translation adjustments | 9,009 |  | (25,109)
Goodwill gross, ending balance | 2,028,729 | 2,028,729 | 1,996,362
Accumulated impairment, ending balance | (96,429) | (96,429) | (96,483)
Goodwill, ending balance | 1,932,300 | 1,932,300 | 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 | 1,503 |  | 51
Foreign currency translation adjustments | 6,116 |  | (15,837)
Goodwill gross, ending balance | 1,342,606 | 1,342,606 | 1,313,078
Accumulated impairment, ending balance | 0 | 0 | 0
Goodwill, ending balance | 1,342,606 | 1,342,606 | 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 |  | 0
Foreign currency translation adjustments | 2,893 |  | (9,272)
Goodwill gross, ending balance | 686,123 | 686,123 | 683,284
Accumulated impairment, ending balance | (96,429) | (96,429) | (96,483)
Goodwill, ending balance | $ 589,694 | $ 589,694 | $ 586,801

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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