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Acquisitions - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Business Combinations [Abstract]    
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) (24,633)
Deferred tax liabilities, net (13,791) (5,056)
Other long-term liabilities (5,326) (5,606)
Non-controlling interests   747
Total identifiable net assets 51,522 69,771
Goodwill 44,610 51,935
Fair value of total consideration transferred $ 96,132 $ 121,706