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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, beginning balance		$ 1,596,695	$ 1,445,927
Goodwill acquired		51,860	174,485
Purchase price allocation adjustments		(8,117)
Goodwill impaired	$ (39,800)	(39,826)
Foreign currency translation adjustments		(47,954)	(23,717)
Goodwill	1,592,551	1,592,551
Accumulated impairment	(39,893)	(39,893)
Goodwill, ending balance	1,552,658	1,552,658	1,596,695	$ 1,445,927
Electric Power Division [Member]
Goodwill [Line Items]
Goodwill, beginning balance		1,223,224	1,168,084
Goodwill acquired		31,224	71,517	112,500
Purchase price allocation adjustments		750
Foreign currency translation adjustments		(28,953)	(16,377)
Goodwill	1,226,245	1,226,245
Goodwill, ending balance	1,226,245	1,226,245	1,223,224	1,168,084
Oil and Gas Infrastructure Division [Member]
Goodwill [Line Items]
Goodwill, beginning balance		373,471	277,843
Goodwill acquired		20,636	102,968	143,300
Purchase price allocation adjustments		(8,867)
Goodwill impaired		(39,826)
Foreign currency translation adjustments		(19,001)	(7,340)
Goodwill	366,306	366,306
Accumulated impairment	(39,893)	(39,893)
Goodwill, ending balance	$ 326,413	$ 326,413	$ 373,471	$ 277,843

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