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Acquisitions (Business Acquisition Purchase Price Allocation Assets Acquired And Liabilities Assumed) (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Business Acquisition [Line Items] |  |
Value of Quanta common stock issued | $ 37,291 | $ 32,368
Cash paid | 68,507 | 84,208
Current assets | 20,516 | 30,198
Property and equipment | 18,821 | 19,878
Other assets | 123 | 379
Identifiable intangible assets | 17,931 | 40,229
Current liabilities | (10,008) | (10,226)
Deferred tax liabilities, net | (6,173) | (7,190)
Other long-term liabilities | (191) | (450)
Total identifiable net assets | 41,019 | 72,818
Goodwill | 64,779 | 43,758
Fair value of total consideration transferred | $ 105,798 | $ 116,576

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