Accounts Receivable, Allowance for Credit Loss, (Writeoff) Recovery

No definition available.

Name:	pwr_AccountsReceivableAllowanceForCreditLossWriteoffRecovery
Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Contract With Customer, Cumulative Catch-Up Adjustment, Revenue, Change In Estimate, Percent

+ References

No definition available.

+ Details

Name:	pwr_ContractWithCustomerCumulativeCatchUpAdjustmentRevenueChangeInEstimatePercent
Namespace Prefix:	pwr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contract With Customer, Cumulative Catch-Up Adjustment To Gross Profit, Change In Estimate

+ References

No definition available.

+ Details

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

- Definition

Contract With Customer, Cumulative Catch-Up Adjustment, To Gross Profit, Change In Estimate, Percent

+ References

No definition available.

+ Details

Name:	pwr_ContractWithCustomerCumulativeCatchUpAdjustmentToGrossProfitChangeInEstimatePercent
Namespace Prefix:	pwr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contract With Customer, Liability, Deferred Revenues, Current

+ References

No definition available.

+ Details

Name:	pwr_ContractWithCustomerLiabilityDeferredRevenuesCurrent
Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number Of Customers Representing Ten Percent Or More Of Revenue

+ References

No definition available.

+ Details

Name:	pwr_NumberOfCustomersRepresentingTenPercentOrMoreOfRevenue
Namespace Prefix:	pwr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Pools

+ References

No definition available.

+ Details

Name:	pwr_NumberOfPools
Namespace Prefix:	pwr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Revenue From Contract With Customer, Percentage Of Revenue Recognized Over Time

+ References

No definition available.

+ Details

Name:	pwr_RevenueFromContractWithCustomerPercentageOfRevenueRecognizedOverTime
Namespace Prefix:	pwr_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue recognition.

+ References

No definition available.

+ Details

Name:	pwr_RevenueRecognitionLineItems
Namespace Prefix:	pwr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue Recognized, Related To Unapproved Change Orders And Claims

+ References

No definition available.

+ Details

Name:	pwr_RevenueRecognizedRelatedToUnapprovedChangeOrdersAndClaims
Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-21

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-20

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482861/275-10-50-18

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482861/275-10-50-20

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-8

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-8

+ Details

Name:	us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as noncurrent.

+ References

+ Details

Name:	us-gaap_ContractWithCustomerReceivableAfterAllowanceForCreditLossNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 912
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482312/912-310-45-2

+ Details

Name:	us-gaap_UnbilledContractsReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=pwr_CanadaTransmissionProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_AccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=pwr_RenewableEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=pwr_FinancialInstrumentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CreditConcentrationRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	pwr_CreditRiskGroupAxis=pwr_SecondaryPoolMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=pwr_LimetreeBayRefiningLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_AccountsPayableAndAccruedLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=pwr_ProjectsInProgressMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Revenue Recognition and Related Balance Sheet Accounts - Additional Information (Details)			12 Months Ended
	Dec. 31, 2023 USD ($) pool	Dec. 31, 2022 USD ($)	Dec. 31, 2023 USD ($) customer pool	Dec. 31, 2022 USD ($) customer	Dec. 31, 2021 USD ($) customer
Revenue Recognition [Line Items]
Revenues recognized related to change orders and claims	$ 778,900,000	$ 549,300,000	$ 778,900,000	$ 549,300,000
Change in contract estimates, favorable (unfavorable) impact on revenue, percent			0.40%	0.70%	1.00%
Change in contract estimates, (favorable) unfavorable impact on operating results, percent					(5.70%)
Change in contract estimates, (favorable) unfavorable impact on operating results, amount				$ 0	$ (111,500,000)
Percent of total revenues recognized associated with revenue recognition method			56.50%	51.60%	45.90%
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period			$ 1,040,000,000.00	$ 695,100,000	$ 433,300,000
Number of pools \| pool	2		2
Current retainage balances	$ 610,000,000	397,600,000	$ 610,000,000	397,600,000
Non-current retainage balances	78,700,000	136,200,000	78,700,000	136,200,000
Unbilled receivables	$ 743,600,000	$ 823,900,000	743,600,000	$ 823,900,000	$ 679,000,000
Canada Transmission Project
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, amount			$ 20,900,000
Customer Concentration Risk
Revenue Recognition [Line Items]
Number of customers representing ten percent or more of revenues \| customer			0	0	0
Accounts Receivable \| Customer Concentration Risk \| Renewable Energy
Revenue Recognition [Line Items]
Concentration risk (in percent)	10.00%	10.00%
Financial Instruments \| Credit Concentration Risk \| Secondary Pool
Revenue Recognition [Line Items]
Concentration risk (in percent)	14.00%
Limetree Bay Refining, LLC
Revenue Recognition [Line Items]
Write-offs charged against the allowance net of recoveries of amounts previously written off				$ 31,700,000
Accounts payable and accrued expenses
Revenue Recognition [Line Items]
Unearned revenues	$ 58,600,000	$ 59,600,000	$ 58,600,000	$ 59,600,000	$ 51,800,000
Projects In Progress
Revenue Recognition [Line Items]
Change in contract estimates, (favorable) unfavorable impact on operating results, percent			5.00%	5.00%