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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | $ 1,642,902 |
Accumulated impairment, beginning balance | (39,733) |
Goodwill, beginning balance | 1,603,169 |
Goodwill acquired | 311,403 | $ 311,400
Purchase price allocation adjustments | (1,278) |
Foreign currency translation adjustments | 23,751 |
Goodwill gross, ending balance | 1,977,911 | 1,977,911
Accumulated impairment, ending balance | (40,866) | (40,866)
Goodwill, ending balance | 1,937,045 | 1,937,045
Electric Power Infrastructure Services Division |  |
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | 1,253,979 |
Accumulated impairment, beginning balance | 0 |
Goodwill, beginning balance | 1,253,979 |
Goodwill acquired | 5,866 |
Purchase price allocation adjustments | (619) |
Foreign currency translation adjustments | 14,767 |
Goodwill gross, ending balance | 1,273,993 | 1,273,993
Accumulated impairment, ending balance | 0 | 0
Goodwill, ending balance | 1,273,993 | 1,273,993
Oil and Gas Infrastructure Services Division |  |
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | 388,923 |
Accumulated impairment, beginning balance | (39,733) |
Goodwill, beginning balance | 349,190 |
Goodwill acquired | 305,537 |
Purchase price allocation adjustments | (659) |
Foreign currency translation adjustments | 8,984 |
Goodwill gross, ending balance | 703,918 | 703,918
Accumulated impairment, ending balance | (40,866) | (40,866)
Goodwill, ending balance | $ 663,052 | $ 663,052

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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