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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Valuation allowance for deferred income tax assets | $ 15,186,000 us-gaap_DeferredTaxAssetsValuationAllowance | $ 15,644,000 us-gaap_DeferredTaxAssetsValuationAllowance | $ 9,300,000 us-gaap_DeferredTaxAssetsValuationAllowance
(Increase) decrease in total valuation allowance | 400,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (6,300,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (500,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax effect of state and foreign net operating loss carryforwards | 21,511,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 20,828,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
2015 | 100,000 pwr_ExpirationAmountOfStateAndForeignNetOperatingLossCarryforwardsYearOne |  |
2016 | 0 pwr_ExpirationAmountOfStateAndForeignNetOperatingLossCarryforwardsYearTwo |  |
2017 | 700,000 pwr_ExpirationAmountOfStateAndForeignNetOperatingLossCarryforwardsYearThree |  |
2018 | 100,000 pwr_ExpirationAmountOfStateAndForeignNetOperatingLossCarryforwardsYearFour |  |
2019 | 0 pwr_ExpirationAmountOfStateAndForeignNetOperatingLossCarryforwardsYearFive |  |
Thereafter | 24,400,000 pwr_ExpirationAmountOfStateAndForeignNetOperatingLossCarryforwardsThereafter |  |
Valuation allowance foreign and state net operating loss carryforwards | 13,900,000 us-gaap_OperatingLossCarryforwardsValuationAllowance |  |
Not provided U.S. income taxes of unremitted foreign earnings | 344,500,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Reduction due to expiration of certain federal and state statutes of limitations | 9,376,000 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 11,479,000 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 11,965,000 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Interest and penalties expense (income) in the provision for income taxes | 500,000 pwr_InterestAndPenaltiesExpenseIncomeInProvisionForIncomeTaxes | (300,000)pwr_InterestAndPenaltiesExpenseIncomeInProvisionForIncomeTaxes | (1,100,000)pwr_InterestAndPenaltiesExpenseIncomeInProvisionForIncomeTaxes
Gross Amount Before Balance Sheet Presentation Netting [Member] |  |  |
Income Taxes [Line Items] |  |  |
Tax effect of state and foreign net operating loss carryforwards | $ 25,300,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = pwr_GrossAmountBeforeBalanceSheetPresentationNettingMember |  |
Minimum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2011 |  |
Open Tax Year | 2013 |  |
Maximum [Member] |  |  |
Income Taxes [Line Items] |  |  |
Income Tax Examination, Year under Examination | 2012 |  |
Open Tax Year | 2014 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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