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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | $ 1,966,432 |
Accumulated impairment, beginning balance | (97,832) |
Goodwill, beginning balance | 1,868,600 |
Goodwill acquired | 41,709 | $ 344,100
Foreign currency translation adjustments | (7,438) |
Goodwill gross, ending balance | 2,000,474 | 2,000,474
Accumulated impairment, ending balance | (97,603) | (97,603)
Goodwill, ending balance | 1,902,871 | 1,902,871
Electric Power Infrastructure Services Division |  |
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | 1,272,527 |
Accumulated impairment, beginning balance | 0 |
Goodwill, beginning balance | 1,272,527 |
Goodwill acquired | 41,709 |
Foreign currency translation adjustments | (4,699) |
Goodwill gross, ending balance | 1,309,537 | 1,309,537
Accumulated impairment, ending balance | 0 | 0
Goodwill, ending balance | 1,309,537 | 1,309,537
Oil and Gas Infrastructure Services Division |  |
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | 693,905 |
Accumulated impairment, beginning balance | (97,832) |
Goodwill, beginning balance | 596,073 |
Goodwill acquired | 0 |
Foreign currency translation adjustments | (2,739) |
Goodwill gross, ending balance | 690,937 | 690,937
Accumulated impairment, ending balance | (97,603) | (97,603)
Goodwill, ending balance | $ 593,334 | $ 593,334

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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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