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Acquisition - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued $ 70,200 $ 88,900
Cash paid 171,500 341,100
Goodwill 1,880,090 1,780,717
All Acquisitions [Member]
    
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued 70,179 88,895
Cash paid 171,456 341,064
Fair value of total consideration transferred 241,635 429,959
Current assets 115,260 193,895
Property and equipment 87,755 60,988
Other assets 3,500 1,009
Identifiable intangible assets 51,198 55,124
Current liabilities (104,699) (127,430)
Deferred tax liabilities, net (15,525) (4,083)
Other long-term liabilities (4,926) (5,350)
Total identifiable net assets 132,563 174,153
Goodwill 109,072 255,806
Fair value of total consideration transferred $ 241,635 $ 429,959