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Acquisitions - Unaudited Supplemental ProForma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Combinations [Abstract]
Revenues	$ 2,042,186	$ 1,981,430	$ 5,574,327	$ 5,812,597
Gross profit	302,582	241,666	709,820	725,969
Selling, general and administrative expenses	164,325	149,662	482,226	455,755
Amortization of intangible assets	8,094	9,583	24,312	30,173
Net income from continuing operations	73,547	46,525	111,164	137,181
Net income from continuing operations attributable to common stock	$ 73,137	$ 43,957	$ 110,224	$ 126,456
Earnings per share from continuing operations attributable to common stock - basic and diluted	$ 0.47	$ 0.23	$ 0.70	$ 0.61

X

- Definition

The pro forma amortization of intangible assets for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	pwr_
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Balance Type:	debit
Period Type:	duration

X

- Definition

The pro forma gross profit for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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X

- Definition

The pro forma net income(loss) attributable to common stock for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The pro forma selling, general and administrative expenses for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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X

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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X

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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- References

No definition available.

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