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Debt Obligations - Debt Obligations (Parenthetical) (Detail)	Dec. 31, 2012	Dec. 31, 2011
Minimum [Member]
Debt Obligations [Line Items]
Annual interest rate	0.00%	0.00%
Maximum [Member]
Debt Obligations [Line Items]
Annual interest rate	8.00%	8.00%

X

- Details

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

X

- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant