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Employee Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Employee Benefit Plans [Line Items] |  |  |
Multiemployer defined contribution and other benefit plan contributions other than MEP DBP | $ 129.0 pwr_MultiemployerDefinedContributionPlanPeriodContributions | $ 104.4 pwr_MultiemployerDefinedContributionPlanPeriodContributions | $ 87.0 pwr_MultiemployerDefinedContributionPlanPeriodContributions
Contributions to the deferred compensation plan | 0.3 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | 0 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | 0 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Deferred compensation obligations included in other long-term liabilities | 2.3 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent |  |
Deferred compensation obligations included in other long-term assets | 2.0 us-gaap_DeferredCompensationPlanAssets |  |
401K Plan [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Percentage of contribution by employer of each employee's contribution up to 3% | 100.00%pwr_PercentageOfContributionByEmployerOfEachEmployeeContributionUpToSpecificPercentage / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = pwr_FourZeroOneKPlanMember |  |
Percentage of contribution by employer of each employee who contributes between three and six percent | 50.00%pwr_PercentageOfContributionByEmployerOfEachEmployeeWhoContributesToPlan / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = pwr_FourZeroOneKPlanMember |  |
Percentage of employee contribution, lower range | 3.00%pwr_PercentageOfEmployeeContributionLowRange / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = pwr_FourZeroOneKPlanMember |  |
Percentage of employee contribution, high range | 6.00%pwr_PercentageOfEmployeeContributionHighRange / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = pwr_FourZeroOneKPlanMember |  |
Quanta 401(k) Plan, Contributions to non-union defined contribution plans | $ 14.3 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = pwr_FourZeroOneKPlanMember | $ 11.8 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = pwr_FourZeroOneKPlanMember | $ 11.0 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = pwr_FourZeroOneKPlanMember
Red Zone [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Percentage Funded in this Zone | Less than 65% |  |
Yellow Zone [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Percentage Funded in this Zone | Less than 80% |  |
Green Zone [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Percentage Funded in this Zone | at least 80% |  |

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- Details
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Namespace Prefix: | pwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Multiemployer defined contribution plan period contributions. + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage Funded In This Zone + References No definition available. + Details
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Namespace Prefix: | pwr_
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- Definition Percentage of contribution by employer of each employee contribution up to specific percentage. + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition Percentage of contribution by employer of each employee who contributes between three and six percent. + References No definition available. + Details
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X
- Definition Percentage of employee contribution, high range. + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employee contribution, low range. + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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Period Type: | duration

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- Details
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- Details
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