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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
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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

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- Definition Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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