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Acquisitions (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 24, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Contingent consideration, maximum |  | $ 157,300,000 |  | $ 157,300,000 |
Net tangible assets acquired |  | 43,600,000 |  | 43,600,000 |
Other intangible assets acquired |  |  |  | 39,900,000 |
Goodwill acquired |  | 21,909,000 |  | 34,300,000 | $ 56,337,000
Acquisitions 2019 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration for the acquisition | $ 50,900,000 |  |  |  |
Cash consideration |  | 50,907,000 |  |  |
Value of Quanta common stock issued |  | 0 |  |  |
Fair value of contingent consideration liability |  | 0 |  | 0 |
Other intangible assets acquired |  | 7,337,000 |  |  |
Goodwill acquired |  | 21,909,000 |  |  |
Goodwill expected to be deductible for income tax |  | 0 |  | $ 0 |
Revenues included in consolidated results of operations |  | 7,400,000 |  |  |
Income (loss) before taxes |  | (1,000,000.0) |  |  |
Acquisition costs |  | $ 2,400,000 |  |  |
Acquisitions 2018 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration |  |  |  |  | $ 106,804,000
Number of shares granted for acquired companies (in shares) |  |  |  |  | 679,668
Value of Quanta common stock issued |  |  |  |  | $ 22,882,000
Contingent consideration, maximum |  |  |  |  | 18,000,000.0
Fair value of contingent consideration liability |  |  |  |  | 16,471,000
Goodwill acquired |  |  |  |  | 56,337,000
Goodwill expected to be deductible for income tax |  |  |  |  | $ 20,100,000
Revenues included in consolidated results of operations |  |  | $ 8,100,000 |  |
Income (loss) before taxes |  |  | (5,300,000) |  |
Acquisition costs |  |  | $ 5,600,000 |  |
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

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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=35744584&loc=d3e6927-128479 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + 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 (d) -URI http://asc.fasb.org/extlink&oid=35744584&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=84229725&loc=d3e1043-128460 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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