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Acquisition - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Business Acquisition [Line Items]    
Goodwill $ 1,650,012 $ 1,537,645
All Acquisitions [Member]
    
Business Acquisition [Line Items]    
Value of Quanta common stock issued 19,618 37,291
Cash paid 165,246 68,507
Fair value of total consideration transferred 184,864 105,798
Current assets 124,563 20,516
Property and equipment 14,221 18,821
Other assets 1,009 123
Identifiable intangible assets 25,934 17,931
Current liabilities (93,026) (10,008)
Deferred tax liabilities, net (4,083) (6,173)
Other long-term liabilities (1,617) (191)
Total identifiable net assets 67,001 41,019
Goodwill 117,863 64,779
Fair value of total consideration transferred $ 184,864 $ 105,798