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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 1,484 | $ 19,200 |
Acquisitions 2017 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Value of Quanta common stock issued | $ 8,300 | 8,267 |  |
Cash paid or payable | 5,600 | 5,554 |  |
Contingent consideration | 0 | 0 | 0 |
Fair value of total consideration transferred or estimated to be transferred |  | 13,821 |  |
Current assets | 6,365 | 6,365 | 6,365 |
Property and equipment | 890 | 890 | 890 |
Other assets | 12 | 12 | 12 |
Identifiable intangible assets | 7,053 | 7,053 | 7,053 |
Current liabilities | (1,983) | (1,983) | (1,983) |
Deferred tax liabilities, net | 0 | 0 | 0 |
Other long-term liabilities | 0 | 0 | 0 |
Total identifiable net assets | 12,337 | 12,337 | 12,337 |
Goodwill |  | 1,484 |  |
Fair value of total consideration transferred or estimated to be transferred | $ 13,821 | $ 13,821 | $ 13,821 |
Acquisitions 2016 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Value of Quanta common stock issued |  |  |  | $ 1,508
Cash paid or payable |  |  |  | 75,941
Contingent consideration |  |  |  | 18,683
Fair value of total consideration transferred or estimated to be transferred |  |  |  | 96,132
Current assets |  |  |  | 24,233
Property and equipment |  |  |  | 44,863
Other assets |  |  |  | 2,553
Identifiable intangible assets |  |  |  | 11,467
Current liabilities |  |  |  | (12,097)
Deferred tax liabilities, net |  |  |  | (13,484)
Other long-term liabilities |  |  |  | (5,326)
Total identifiable net assets |  |  |  | 52,209
Goodwill |  |  |  | 43,923
Fair value of total consideration transferred or estimated to be transferred |  |  |  | $ 96,132

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