XML 91 R78.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Employee Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Employee Benefit Plans [Line Items] |  |  |
Multiemployer defined contribution and other benefit plan contributions other than MEP DBP | $ 147,100,000 | $ 129,000,000 | $ 104,400,000
Contributions to the deferred compensation plan | 1,000,000 | 300,000 | 0
Deferred compensation obligations included in other long-term liabilities | 11,700,000 | 2,300,000 |
Deferred compensation obligations included in other long-term assets | $ 11,300,000 | 2,000,000 |
401K Plan [Member] |  |  |
Employee Benefit Plans [Line Items] |  |  |
Percentage of contribution by employer of each employee's contribution up to 3% | 100.00% |  |
Percentage of contribution by employer of each employee who contributes between three and six percent | 50.00% |  |
Percentage of employee contribution, lower range | 3.00% |  |
Percentage of employee contribution, high range | 6.00% |  |
Contributions to Quanta 401(k) Plan | $ 17,700,000 | $ 13,900,000 | $ 11,500,000
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% |  |

X
- Definition Employee Benefit Plans [Line Items] + References No definition available. + Details
Name: | pwr_EmployeeBenefitPlansLineItems
Namespace Prefix: | pwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Percentage Funded In This Zone + References No definition available. + Details
Name: | pwr_PercentageFundedInThisZone
Namespace Prefix: | pwr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of contribution by employer of each employee contribution up to specific percentage. + References No definition available. + Details
Name: | pwr_PercentageOfContributionByEmployerOfEachEmployeeContributionUpToSpecificPercentage
Namespace Prefix: | pwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of contribution by employer of each employee who contributes between three and six percent. + References No definition available. + Details
Name: | pwr_PercentageOfContributionByEmployerOfEachEmployeeWhoContributesToPlan
Namespace Prefix: | pwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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

X
- 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
Name: | us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
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
Name: | us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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 + Details
Name: | us-gaap_DeferredCompensationPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis=pwr_FourZeroOneKPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=pwr_RedZoneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=pwr_YellowZoneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=pwr_GreenZoneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |