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Acquisitions - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration, maximum | $ 153,000 |  |  | $ 153,000 |  | $ 153,000 |
Net tangible assets acquired | 111,800 |  |  | 111,800 |  | 111,800 |
Other intangible assets acquired |  |  |  |  |  | 190,800 |
Goodwill acquired |  |  |  | 97,343 |  | 97,300 | $ 56,337
Bargain purchase gain, net of deferred tax | 0 | $ 3,100 | $ 0 | 3,138 | $ 0 |  |
Acquisitions 2019 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 395,019 |  |  |
Number of shares granted for acquired companies (in shares) |  |  |  | 60,860 |  |  |
Value of Quanta common stock issued |  |  |  | $ 1,791 |  |  |
Fair value of contingent consideration liability | 0 |  |  | 0 |  | 0 |
Other intangible assets acquired |  |  |  | 190,785 |  |  |
Goodwill acquired |  |  |  | 97,343 |  |  |
Bargain purchase gain, net of deferred tax |  |  |  | 3,139 |  |  |
Goodwill expected to be deductible for income tax | 77,800 |  |  | 77,800 |  | 77,800 |
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 |  |  |
Acquisitions 2018 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 108,307
Number of shares granted for acquired companies (in shares) |  |  |  |  |  |  | 679,668
Value of Quanta common stock issued |  |  |  |  |  |  | $ 22,882
Contingent consideration, maximum |  |  |  |  |  |  | 18,000
Fair value of contingent consideration liability |  |  |  |  |  |  | 16,471
Goodwill acquired |  |  |  |  |  |  | 57,840
Bargain purchase gain, net of deferred tax |  |  |  |  |  |  | 0
Goodwill expected to be deductible for income tax |  |  |  |  |  |  | $ 21,600
Revenues included in consolidated results of operations |  |  | 12,900 |  | 32,200 |  |
Income (loss) before taxes |  |  | (5,100) |  | (11,700) |  |
Acquisition costs |  |  | $ 5,000 |  | $ 11,000 |  |
Acquisitions 2018 | Minimum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration financial target term |  |  |  |  |  |  | 3 years
Acquisitions 2018 | Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration financial target term |  |  |  |  |  |  | 5 years
Hallen |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of pension plan net liability | 5,300 |  |  | 5,300 |  | 5,300 |
Fair market value of pension plan liabilities acquired | 26,500 |  |  | 26,500 |  | 26,500 |
Fair market value of pension plan assets acquired | $ 21,200 |  |  | $ 21,200 |  | $ 21,200 |

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