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, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued $ 38,641 $ 88,895
Cash paid 83,200 341,100
All Acquisitions [Member]
   
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued 38,641 88,895
Cash paid 83,242 341,064
Fair value of total consideration transferred 121,883 429,959
Current assets 53,174 193,895
Property and equipment 33,445 60,988
Other assets 3,374 1,009
Identifiable intangible assets 22,368 55,124
Current liabilities (41,283) (127,430)
Deferred tax liabilities, net (3,604) (4,083)
Other long-term liabilities (3,935) (5,350)
Total identifiable net assets 63,539 174,153
Goodwill 58,344 255,806
Fair value of total consideration transferred $ 121,883 $ 429,959