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Acquisitions - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Net tangible assets acquired | $ 106,000 |  | $ 106,000 |  | $ 106,000 |
Other intangible assets acquired |  |  |  |  | 80,700 |
Goodwill acquired |  |  | 78,125 |  | 89,100 | $ 110,383
Bargain purchase gain, net of deferred tax |  |  |  |  |  | 3,100
Acquisitions 2020 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  |  | $ 220,572 |  |  |
Number of shares granted for acquired companies (in shares) |  |  | 1,204,586 |  |  |
Value of Quanta common stock issued |  |  | $ 49,690 |  |  |
Other intangible assets acquired |  |  | 77,734 |  |  |
Goodwill acquired |  |  | 78,125 |  |  |
Bargain purchase gain, net of deferred tax |  |  | 0 |  |  |
Goodwill expected to be deductible for income tax | 71,800 |  | 71,800 |  | $ 71,800 |
Revenues included in consolidated results of operations | 55,200 |  | 63,000 |  |  |
Income (loss) before taxes | 1,000 |  | 1,000 |  |  |
Acquisition costs | $ 10,600 |  | 11,400 |  |  |
Acquisitions 2019 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  |  | $ 395,300 |  |  | 395,258
Number of shares granted for acquired companies (in shares) |  |  | 60,860 |  |  |
Value of Quanta common stock issued |  |  | $ 1,800 |  |  | 1,791
Goodwill acquired |  |  |  |  |  | 112,132
Bargain purchase gain, net of deferred tax |  |  |  |  |  | 3,139
Goodwill expected to be deductible for income tax |  |  |  |  |  | $ 82,100
Revenues included in consolidated results of operations |  | $ 56,700 |  | $ 78,400 |  |
Income (loss) before taxes |  | (10,100) |  | (6,000) |  |
Acquisition costs |  | $ 17,000 |  | $ 19,400 |  |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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