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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Goodwill [Line Items]
Goodwill, beginning balance	$ 1,780,717
Goodwill acquired	54,645
Foreign currency translation related to goodwill	(3,315)
Goodwill, ending balance	1,832,047
Electric Power Division [Member]
Goodwill [Line Items]
Goodwill, beginning balance	1,168,084
Goodwill acquired	47,089
Foreign currency translation related to goodwill	(5,261)
Goodwill, ending balance	1,209,912
Oil and Gas Infrastructure Division [Member]
Goodwill [Line Items]
Goodwill, beginning balance	277,843
Goodwill acquired	7,556
Foreign currency translation related to goodwill	1,946
Goodwill, ending balance	287,345
Fiber Optic Licensing Division[Member]
Goodwill [Line Items]
Goodwill, beginning balance	334,790
Goodwill acquired
Foreign currency translation related to goodwill
Goodwill, ending balance	$ 334,790

X

- 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

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X

- 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

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X

- 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

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