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Document and Entity Information	12 Months Ended
	Feb. 20, 2013
Entity Information [Line Items]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Feb. 21, 2013
Trading Symbol	PWR
Entity Registrant Name	QUANTA SERVICES INC
Entity Central Index Key	0001050915

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word "Other".

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- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

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Trading symbol of an instrument as listed on an exchange.

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