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Commitments and Contingencies - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended |  |  |
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Oct. 09, 2013 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2014 Customer | Dec. 31, 2013 Customer | Dec. 31, 2012 Customer | Apr. 30, 2014 | Mar. 31, 2014 | Jul. 31, 2014 | Dec. 31, 2011 | Apr. 21, 2010 mi
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding capital commitment |  | $ 800,000 pwr_OutstandingCapitalCommitments |  |  |  |  |  |  |  |  |  |
Rent expense related to operating leases |  |  |  |  | 162,500,000 us-gaap_LeaseAndRentalExpense | 112,800,000 us-gaap_LeaseAndRentalExpense | 92,300,000 us-gaap_LeaseAndRentalExpense |  |  |  |  |
Maximum guaranteed residual value |  |  | 434,200,000 us-gaap_GuaranteeObligationsMaximumExposure |  | 434,200,000 us-gaap_GuaranteeObligationsMaximumExposure |  |  |  |  |  |  |
Provision for long-term contract receivable |  |  | 49,900,000 pwr_ProvisionForLongtermContractReceivable | 52,500,000 pwr_ProvisionForLongtermContractReceivable | 102,460,000 pwr_ProvisionForLongtermContractReceivable |  |  |  |  |  |  |
Selling, general and administrative expenses |  |  |  |  | 722,038,000 us-gaap_SellingGeneralAndAdministrativeExpense | 501,010,000 us-gaap_SellingGeneralAndAdministrativeExpense | 434,894,000 us-gaap_SellingGeneralAndAdministrativeExpense |  |  |  |  |
Number of customers representing ten percent or more of net position |  |  |  |  |  | 2 pwr_NumberOfCustomersRepresentingNetPositionThreshold |  |  |  |  |  |
Number of customers representing ten percent or more of consolidated revenues |  |  |  |  | 0 pwr_NumberOfCustomersRepresentingTenPercentOrMoreOfConsolidatedRevenues | 0 pwr_NumberOfCustomersRepresentingTenPercentOrMoreOfConsolidatedRevenues | 0 pwr_NumberOfCustomersRepresentingTenPercentOrMoreOfConsolidatedRevenues |  |  |  |  |
Gross amount accrued for insurance claims |  |  | 170,200,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  | 170,200,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense | 161,800,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense |  |  |  |  |  |
Long-term insurance claims |  |  | 130,800,000 pwr_LongTermInsuranceClaims |  | 130,800,000 pwr_LongTermInsuranceClaims | 122,600,000 pwr_LongTermInsuranceClaims |  |  |  |  |  |
Related insurance recoveries/receivables |  |  | 9,100,000 us-gaap_InsuranceSettlementsReceivable |  | 9,100,000 us-gaap_InsuranceSettlementsReceivable | 9,100,000 us-gaap_InsuranceSettlementsReceivable |  |  |  |  |  |
Related insurance recoveries/receivables included in prepaid expenses and other current assets |  |  | 800,000 us-gaap_InsuranceSettlementsReceivableCurrent |  | 800,000 us-gaap_InsuranceSettlementsReceivableCurrent | 700,000 us-gaap_InsuranceSettlementsReceivableCurrent |  |  |  |  |  |
Related insurance recoveries/receivables included in other assets net |  |  | 8,300,000 us-gaap_InsuranceSettlementsReceivableNoncurrent |  | 8,300,000 us-gaap_InsuranceSettlementsReceivableNoncurrent | 8,400,000 us-gaap_InsuranceSettlementsReceivableNoncurrent |  |  |  |  |  |
Letters of credit and bank guarantees under the credit facility |  |  | 336,700,000 us-gaap_LettersOfCreditOutstandingAmount |  | 336,700,000 us-gaap_LettersOfCreditOutstandingAmount |  |  |  |  |  |  |
Total amount of outstanding performance bonds |  |  | 2,800,000,000 pwr_OutstandingPerformanceBondsAmount |  | 2,800,000,000 pwr_OutstandingPerformanceBondsAmount |  |  |  |  |  |  |
Estimated cost to complete bonded projects |  |  | 701,000,000 pwr_EstimatedCostToCompleteBondedProjects |  | 701,000,000 pwr_EstimatedCostToCompleteBondedProjects |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation |  |  |  |  |  |  |  |  |  | 39,600,000 us-gaap_MultiemployerPlansWithdrawalObligation | 32,600,000 us-gaap_MultiemployerPlansWithdrawalObligation |
Multi-employer plan withdrawal obligation, amount suggested by Plan which is different than amount recorded by company | 6,900,000 pwr_MultiemployerPlanWithdrawalObligationAmountSuggestedByPlanDifferentThanAmountRecordedByCompany |  |  |  |  |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation complete withdrawal | 4,800,000 pwr_MultiemployerPlanWithdrawalObligationCompleteWithdrawal |  |  |  |  |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation accrued |  |  |  |  | 3,100,000 pwr_MultiemployerPlanWithdrawalObligationAccrued |  |  |  |  |  |  |
Cash proceeds deposited in Escrow account | 2,100,000 pwr_EscrowedFundsToCoverMultipleEmployerPlansLiabilityOfAcquiredCompany |  |  |  |  |  |  |  |  |  |  |
Customer One [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net position |  |  |  |  |  | 15.00%pwr_CustomerConcentrationAmountOfNetPosition / us-gaap_MajorCustomersAxis = pwr_CustomerOneMember |  |  |  |  |  |
Other Customer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net position |  |  |  |  |  | 11.00%pwr_CustomerConcentrationAmountOfNetPosition / us-gaap_MajorCustomersAxis = pwr_OtherCustomerMember |  |  |  |  |  |
Sunrise Powerlink Project [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Length of electrical transmission line to be constructed under contract |  |  |  |  |  |  |  |  |  |  |  | 117 pwr_LengthOfTransmissionLine / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember
Long-term contract receivable |  |  |  |  |  | 165,000,000 us-gaap_LongTermInvestmentsAndReceivablesNet / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember |  |  |  |  |  |
Claim for breach of contract |  |  |  |  | 113,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember |  |  |  |  |  |  |
Counterclaim for alleged untimely performance and breach of contract |  |  |  |  | 32,000,000 pwr_LossContingencyRelatedToLongTermReceivable / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember |  |  |  |  |  |  |
Contract receivable |  |  | 65,000,000 us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedInRemainderOfFiscalYear / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember |  | 65,000,000 us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedInRemainderOfFiscalYear / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember |  |  |  |  |  |  |
Provision for long-term contract receivable |  |  | 49,900,000 pwr_ProvisionForLongtermContractReceivable / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember | 52,500,000 pwr_ProvisionForLongtermContractReceivable / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember | 102,500,000 pwr_ProvisionForLongtermContractReceivable / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember |  |  |  |  |  |  |
Alberta Power Line [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Length of electrical transmission line to be constructed under contract |  |  | 500 pwr_LengthOfTransmissionLine / us-gaap_TypeOfArrangementAxis = pwr_AlbertaPowerLineMember |  | 500 pwr_LengthOfTransmissionLine / us-gaap_TypeOfArrangementAxis = pwr_AlbertaPowerLineMember |  |  |  |  |  |  |
Payment by 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding capital commitment |  |  |  |  | 10,100,000 pwr_OutstandingCapitalCommitments / us-gaap_StatementScenarioAxis = pwr_PaymentPeriodMember |  |  |  |  |  |  |
Fiber Optic Committed Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated committed capital remainder of current year |  |  | 16,800,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_StatementScenarioAxis = pwr_FiberOpticCommittedCapitalMember |  | 16,800,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_StatementScenarioAxis = pwr_FiberOpticCommittedCapitalMember |  |  |  |  |  |  |
Vehicle Fleet Committed Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated committed capital remainder of current year |  |  | 5,600,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_StatementScenarioAxis = pwr_VehicleFleetCommittedCapitalMember |  | 5,600,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / us-gaap_StatementScenarioAxis = pwr_VehicleFleetCommittedCapitalMember |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation |  |  | 40,100,000 us-gaap_MultiemployerPlansWithdrawalObligation / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 40,100,000 us-gaap_MultiemployerPlansWithdrawalObligation / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |
Minimum [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Minimum [Member] | Net Position [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = pwr_NetPositionMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = pwr_NetPositionMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Multi-employer plan withdrawal obligation |  |  | 55,400,000 us-gaap_MultiemployerPlansWithdrawalObligation / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 55,400,000 us-gaap_MultiemployerPlansWithdrawalObligation / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
National Gas Company of Trinidad and Tobago Arbitration [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Damages sought by Company in arbitration, value |  |  |  |  | 16,500,000 pwr_DamagesSoughtByCompanyInArbitrationValue / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember |  |  |  |  |  |  |
Loss contingency, damages sought by customer in arbitration counterclaim, value |  |  |  |  | 79,500,000 pwr_LossContingencyDamagesSoughtByCustomerInArbitrationCounterclaimValue / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember |  |  |  |  |  |  |
Arbitration damages liability |  |  |  |  |  |  |  |  | 17,300,000 pwr_ArbitrationDamagesLiability / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember |  |  |
Interest payable on arbitration damages and related attorney fees payable |  |  |  |  |  |  |  |  | 11,000,000 pwr_InterestPayableOnArbitrationDamagesAndRelatedAttorneyFeesPayable / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember |  |  |
Amount of arbitration damages and attorneys fee paid |  |  |  |  |  |  |  | 28,300,000 us-gaap_LossContingencyAccrualCarryingValuePayments / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember |  |  |  |
Written Off of accounts receivable |  |  |  |  |  |  |  |  | 10,500,000 pwr_AccountsReceivablesDirectWriteOff / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember |  |  |
Selling, general and administrative expenses |  |  |  |  | 38,800,000 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember |  |  |  | 38,800,000 us-gaap_SellingGeneralAndAdministrativeExpense / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember |  |  |
Lorenzo Bentonv Telecom Network Specialists Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of staffing Agency |  |  |  |  | 29 pwr_NumberOfAgencies / dei_LegalEntityAxis = pwr_LorenzoBentonvTelecomNetworkSpecialistsIncMember |  |  |  |  |  |  |
Lorenzo Bentonv Telecom Network Specialists Inc [Member] | Class Damage [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount sought by plaintiff |  |  |  |  | 16,000,000 pwr_LossContingencyDamagesSoughtValueByPlaintiff / dei_LegalEntityAxis = pwr_LorenzoBentonvTelecomNetworkSpecialistsIncMember / us-gaap_OtherCommitmentsAxis = pwr_ClassDamageMember |  |  |  |  |  |  |
Lorenzo Bentonv Telecom Network Specialists Inc [Member] | Attorney Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount sought by plaintiff |  |  |  |  | $ 5,000,000 pwr_LossContingencyDamagesSoughtValueByPlaintiff / dei_LegalEntityAxis = pwr_LorenzoBentonvTelecomNetworkSpecialistsIncMember / us-gaap_OtherCommitmentsAxis = pwr_AttorneyFeesMember |  |  |  |  |  |  |

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