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Goodwill And Other Intangible Assets (Summary of Changes In Quanta's Goodwill) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill acquired during 2012	$ 64,779
Foreign currency translation related to goodwill	4,827
Goodwill	1,734,080	1,664,474
Accumulated impairment	(63,264)	(63,264)
Goodwill, net	1,670,816	1,601,210
Electric Power Division [Member]
Goodwill [Line Items]
Goodwill acquired during 2012	57,451
Foreign currency translation related to goodwill	4,854
Goodwill	1,051,007	988,702
Goodwill, net	1,051,007	988,702
Natural Gas And Pipeline Division [Member]
Goodwill [Line Items]
Goodwill acquired during 2012	7,328
Foreign currency translation related to goodwill	(27)
Goodwill	120,899	113,598
Goodwill, net	120,899	113,598
Telecommunications Division [Member]
Goodwill [Line Items]
Goodwill	562,174	562,174
Accumulated impairment	(63,264)	(63,264)
Goodwill, net	$ 498,910	$ 498,910

X

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Gross amount, as of the balance sheet date, of the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable), in excess of the fair value of net assets acquired in one or more business combination transactions.

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The accumulated impairment losses related to goodwill as of the balance sheet date.

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The increase (decrease) to the recorded value of goodwill for foreign currency translation adjustments.

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