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Acquisition - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Value of Quanta common stock and exchangeable shares issued $ 36,604 $ 88,895
Cash paid 79,900 341,100
All Acquisitions [Member]
    
Business Acquisition [Line Items]    
Cash paid 79,927 341,064
Fair value of total consideration transferred 116,531 429,959
Current assets 52,986 193,895
Property and equipment 33,387 60,988
Other assets 3,373 1,009
Identifiable intangible assets 21,048 55,124
Current liabilities (41,281) (127,430)
Deferred tax liabilities, net (3,692) (4,083)
Other long-term liabilities (3,935) (5,350)
Total identifiable net assets 61,886 174,153
Goodwill 54,645 255,806
Fair value of total consideration transferred $ 116,531 $ 429,959