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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, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued $ 10,100 $ 134,500
Cash paid or payable 98,941 279,533
Total identifiable net assets   45,100
Goodwill 1,596,931 1,596,695
All Acquisitions [Member]    
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued 10,127 134,538
Cash paid or payable 98,941 279,533
Contingent consideration 1,001  
Fair value of total consideration transferred or estimated to be transferred 110,069 414,071
Current assets 30,763 172,121
Property and equipment 42,839 159,186
Other assets 4 3,501
Identifiable intangible assets 21,668 96,302
Current liabilities (22,317) (145,646)
Deferred tax liabilities, net (7,583) (32,856)
Other long-term liabilities (5,606) (4,926)
Non-controlling interests 747  
Total identifiable net assets 60,515 247,682
Goodwill 49,554 166,389
Fair value of total consideration transferred $ 110,069 $ 414,071