XML 101 R82.htm IDEA: XBRL DOCUMENT v2.4.1.9

Commitment and Contingencies - Outstanding Capital Commitments Associated with Investments in Unconsolidated Affiliates (Parenthetical) (Detail) (Corporate Joint Venture [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Corporate Joint Venture [Member]
Other Commitments [Line Items]
Return of capital from unconsolidated affiliates anticipated for 2017	$ 48.7pwr_ForecastedReturnsOfCapitalFromUnconsolidatedAffiliatesInTwoYears / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember

X

- Definition

Forecasted returns of capital from unconsolidated affiliates in two years.

+ References

No definition available.

+ Details

Name:	pwr_ForecastedReturnsOfCapitalFromUnconsolidatedAffiliatesInTwoYears
Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration