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Acquisitions - Unaudited Supplemental ProForma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Business Combinations [Abstract]
Revenues	$ 1,721,043	$ 1,919,685
Gross profit	203,465	249,172
Selling, general and administrative expenses	159,209	152,008
Amortization of intangible assets	7,650	9,736
Net income from continuing operations	20,397	54,529
Net income from continuing operations attributable to common stock	$ 20,034	$ 49,828
Earnings per share from continuing operations attributable to common stock - basic and diluted	$ 0.12	$ 0.23

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
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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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- 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=56956515&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=56956515&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=56956515&loc=d3e1392-128463

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- References

No definition available.

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