XML 70 R53.htm IDEA: XBRL DOCUMENT v3.6.0.2

Summary of Significant Accounting Policies (Stock-Based Compensation) - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 shares
Restricted Stock Units to be Settled in Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares that may be received by RSU holder	1

X

- Definition

Number of common stock shares received by RSU holder.

+ References

No definition available.

+ Details

Name:	pwr_NumberOfCommonStockSharesReceivedByRsuHolder
Namespace Prefix:	pwr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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

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

X

- Details

Name:	us-gaap_AwardTypeAxis=pwr_RestrictedStockUnitsToBeSettledInCashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: