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Acquisitions - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 21,909 |  | $ 35,800 | $ 56,337
Bargain purchase gain | $ (3,138) | $ 0 | (3,138) | $ 0 |  |
Acquisitions 2019 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable |  |  | 53,345 |  |  |
Value of Quanta common stock issued |  |  | 0 |  |  |
Contingent consideration | 0 |  | 0 |  | 0 |
Fair value of total consideration transferred or estimated to be transferred |  |  | 53,345 |  |  |
Accounts receivable | 12,006 |  | 12,006 |  | 12,006 |
Contract assets | 2,223 |  | 2,223 |  | 2,223 |
Other current assets | 6,177 |  | 6,177 |  | 6,177 |
Property and equipment | 24,042 |  | 24,042 |  | 24,042 |
Other assets | 5 |  | 5 |  | 5 |
Identifiable intangible assets | 7,337 |  | 7,337 |  | 7,337 |
Contract liabilities | 0 |  | 0 |  | 0 |
Other current liabilities | (10,213) |  | (10,213) |  | (10,213) |
Deferred tax liabilities, net | (7,002) |  | (7,002) |  | (7,002) |
Total identifiable net assets | 34,575 |  | 34,575 |  | 34,575 |
Goodwill |  |  | 21,909 |  |  |
Fair value of total consideration transferred or estimated to be transferred | $ 56,484 |  | 56,484 |  | $ 56,484 |
Bargain purchase gain |  |  | $ (3,139) |  |  |
Acquisitions 2018 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid or payable |  |  |  |  |  | 108,307
Value of Quanta common stock issued |  |  |  |  |  | 22,882
Contingent consideration |  |  |  |  |  | 16,471
Fair value of total consideration transferred or estimated to be transferred |  |  |  |  |  | 147,660
Accounts receivable |  |  |  |  |  | 18,405
Contract assets |  |  |  |  |  | 1,905
Other current assets |  |  |  |  |  | 8,484
Property and equipment |  |  |  |  |  | 23,674
Other assets |  |  |  |  |  | 576
Identifiable intangible assets |  |  |  |  |  | 52,364
Contract liabilities |  |  |  |  |  | (175)
Other current liabilities |  |  |  |  |  | (11,205)
Deferred tax liabilities, net |  |  |  |  |  | (4,208)
Total identifiable net assets |  |  |  |  |  | 89,820
Goodwill |  |  |  |  |  | 57,840
Fair value of total consideration transferred or estimated to be transferred |  |  |  |  |  | 147,660
Bargain purchase gain |  |  |  |  |  | $ 0

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