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Commitments and Contingencies (Concentrations of Credit Risk) - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) Customer	Sep. 30, 2015 Customer	Sep. 30, 2016 USD ($) Customer	Sep. 30, 2015 Customer	Dec. 31, 2015 USD ($) Customer
Concentration Risk [Line Items]
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 497,846		$ 497,846		$ 317,745
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Net position balance	287,000		$ 287,000		$ 195,200
Net Receivable Position [Member] | Customer Concentration Risk [Member] | Quanta's Electric Power Infrastructure Services Segment [Member]
Concentration Risk [Line Items]
Number of customers representing ten percent or more of concentration risk | Customer			1		1
Concentration risk percentage			16.00%		12.00%
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 224,100		$ 224,100		$ 83,900
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of customers representing ten percent or more of concentration risk | Customer	0	0	0	0

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Accounts receivable and costs and estimated earnings in excess of billings on uncompleted contracts net of advanced billings with the same customer.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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