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Income Taxes - Balances of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Income Tax Disclosure [Abstract] |  |  |  |
Unrecognized tax benefits | $ 51,079 us-gaap_UnrecognizedTaxBenefits | $ 48,838 us-gaap_UnrecognizedTaxBenefits | $ 51,244 us-gaap_UnrecognizedTaxBenefits | $ 47,379 us-gaap_UnrecognizedTaxBenefits
Portion that, if recognized, would reduce tax expense and effective tax rate | 43,363 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 40,562 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 43,910 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Accrued interest on unrecognized tax benefits | 6,360 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 5,837 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 6,088 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |
Accrued penalties on unrecognized tax benefits | 697 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued | 99 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued | 127 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months lower bound | 0 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound | 0 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound | 0 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months upper bound | 10,331 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound | 6,722 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound | 11,479 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound |
Portion that, if recognized, would reduce tax expense and effective tax rate lower bound | 0 pwr_UnrecognizedTaxBenefitPortionThatIfRecognizedWouldReduceTaxExpenseAndEffectiveTaxRateLowerBound | 0 pwr_UnrecognizedTaxBenefitPortionThatIfRecognizedWouldReduceTaxExpenseAndEffectiveTaxRateLowerBound | 0 pwr_UnrecognizedTaxBenefitPortionThatIfRecognizedWouldReduceTaxExpenseAndEffectiveTaxRateLowerBound |
Portion that, if recognized, would reduce tax expense and effective tax rate upper bound | $ 8,593 pwr_UnrecognizedTaxBenefitPortionThatIfRecognizedWouldReduceTaxExpenseAndEffectiveTaxRateUpperBound | $ 4,984 pwr_UnrecognizedTaxBenefitPortionThatIfRecognizedWouldReduceTaxExpenseAndEffectiveTaxRateUpperBound | $ 9,645 pwr_UnrecognizedTaxBenefitPortionThatIfRecognizedWouldReduceTaxExpenseAndEffectiveTaxRateUpperBound |

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- Definition Unrecognized tax benefit portion that if recognized would reduce tax expense and effective tax rate lower bound. + References No definition available. + Details
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- Definition Unrecognized tax benefit portion that if recognized would reduce tax expense and effective tax rate upper bound. + References No definition available. + Details
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- Definition Amount of (increase) decrease reasonably possible in the estimated lower bound of the unrecognized tax benefit for a tax position taken or expected to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of (increase) decrease reasonably possible in the estimated upper bound of the unrecognized tax benefit for a tax position taken or expected to be taken. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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