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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |
Goodwill | $ 45,186 | $ 51,860
All Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Value of Quanta common stock issued | 1,508 | 10,127
Cash paid or payable | 75,941 | 110,578
Contingent consideration | 18,683 | 1,001
Fair value of total consideration transferred or estimated to be transferred | 96,132 | 121,706
Current assets | 24,233 | 35,188
Property and equipment | 44,863 | 44,140
Other assets | 2,553 | 4
Identifiable intangible assets | 11,467 | 24,987
Current liabilities | (12,477) | (24,568)
Deferred tax liabilities, net | (14,367) | (5,056)
Other long-term liabilities | (5,326) | (5,606)
Non-controlling interests |  | 747
Total identifiable net assets | 50,946 | 69,836
Goodwill | 45,186 | 51,870
Fair value of total consideration transferred | $ 96,132 | $ 121,706

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