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Debt Obligations (Credit Facility - Amended and Restated Credit Agreement) - Additional Information (Detail) - Current Credit Agreement [Member]	6 Months Ended
	Jun. 30, 2016 USD ($)
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	$ 1,810,000,000
Maturity date of senior secured revolving credit facility	Dec. 18, 2020
Option to increase revolving commitments under the credit agreement	$ 400,000,000
Revolving Loans and Letter of Credit in Alternative Currencies [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	600,000,000
U S Dollar [Member] | Swing Lines Loan [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	100,000,000
Canadian Dollars [Member] | Swing Lines Loan [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	50,000,000
Australian Dollars [Member] | Swing Lines Loan [Member]
Line of Credit Facility [Line Items]
Senior secured revolving credit facility	$ 30,000,000

X

- Definition

Option to increase revolving commitments under credit agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	pwr_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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