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Income Taxes - Effective Income Tax Rate Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Provision at the statutory rate	$ 165,591us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 223,737us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 162,603us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increases (decreases) resulting from -
State taxes	9,948us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	14,788us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	10,980us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign taxes	(13,059)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(9,994)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(5,841)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Contingency reserves, net	(696)us-gaap_IncomeTaxReconciliationTaxContingencies	(3,422)us-gaap_IncomeTaxReconciliationTaxContingencies	(3,880)us-gaap_IncomeTaxReconciliationTaxContingencies
Production activity deduction	(6,033)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(10,247)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(7,081)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Employee per diems, meals and entertainment	9,906us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	7,960us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment	6,441us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Taxes on unincorporated joint ventures	(6,429)pwr_IncomeTaxReconciliationTaxesOnUnincorporatedJointVenture	(6,786)pwr_IncomeTaxReconciliationTaxesOnUnincorporatedJointVenture	(5,609)pwr_IncomeTaxReconciliationTaxesOnUnincorporatedJointVenture
Other	(1,820)us-gaap_IncomeTaxReconciliationOtherAdjustments	1,904us-gaap_IncomeTaxReconciliationOtherAdjustments	1,246us-gaap_IncomeTaxReconciliationOtherAdjustments
Total provision for income taxes from continuing operations	$ 157,408us-gaap_IncomeTaxExpenseBenefit	$ 217,940us-gaap_IncomeTaxExpenseBenefit	$ 158,859us-gaap_IncomeTaxExpenseBenefit

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Income tax reconciliation, taxes on unincorporated joint venture.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible meals and entertainment expense.

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