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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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