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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2013
Goodwill [Line Items] |
Goodwill balance at December 31, 2012 | $ 1,537,645
Goodwill acquired during 2013 | 1,052
Foreign currency translation related to goodwill | (8,559)
Goodwill balance at June 30, 2013 | 1,530,138
Electric Power Division [Member] |
Goodwill [Line Items] |
Goodwill balance at December 31, 2012 | 1,065,152
Goodwill acquired during 2013 | 1,052
Foreign currency translation related to goodwill | (7,490)
Goodwill balance at June 30, 2013 | 1,058,714
Natural Gas and Pipeline Division [Member] |
Goodwill [Line Items] |
Goodwill balance at December 31, 2012 | 137,703
Goodwill acquired during 2013 |
Foreign currency translation related to goodwill | (1,069)
Goodwill balance at June 30, 2013 | 136,634
Fiber Optic Licensing Division[Member] |
Goodwill [Line Items] |
Goodwill balance at December 31, 2012 | 334,790
Goodwill acquired during 2013 |
Foreign currency translation related to goodwill |
Goodwill balance at June 30, 2013 | $ 334,790

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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