Quarterly report pursuant to Section 13 or 15(d)

Acquisition - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail)

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Acquisition - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued   $ 134,500
Cash paid or payable $ 64,700 279,500
Fair value of total consideration transferred or estimated to be transferred 65,700  
Goodwill 1,598,654 1,596,695
All Acquisitions [Member]    
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued   134,538
Cash paid or payable 64,663 279,533
Contingent consideration 1,001  
Fair value of total consideration transferred or estimated to be transferred 65,664 414,071
Current assets 18,304 172,121
Property and equipment 29,257 159,186
Other assets 4 3,501
Identifiable intangible assets 14,796 96,302
Current liabilities (15,283) (145,646)
Deferred tax liabilities, net (7,227) (32,856)
Other long-term liabilities (5,244) (4,926)
Non-controlling interests 747  
Total identifiable net assets 35,354 247,682
Goodwill 30,310 166,389
Fair value of total consideration transferred $ 65,664 $ 414,071