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Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Combinations [Abstract] |  |  |
Revenues | $ 8,391,061 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 7,740,575 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 6,477,648 us-gaap_BusinessAcquisitionsProFormaRevenue
Gross profit | 1,267,778 pwr_BusinessAcquisitionsProFormaGrossProfit | 1,254,211 pwr_BusinessAcquisitionsProFormaGrossProfit | 1,060,370 pwr_BusinessAcquisitionsProFormaGrossProfit
Selling, general and administrative expenses | 737,488 pwr_BusinessAcquisitionsProFormaSellingGeneralAndAdministrativeExpenses | 579,818 pwr_BusinessAcquisitionsProFormaSellingGeneralAndAdministrativeExpenses | 478,184 pwr_BusinessAcquisitionsProFormaSellingGeneralAndAdministrativeExpenses
Amortization of intangible assets | 43,658 pwr_BusinessAcquisitionsProFormaAmortizationOfIntangibleAssets | 52,405 pwr_BusinessAcquisitionsProFormaAmortizationOfIntangibleAssets | 52,339 pwr_BusinessAcquisitionsProFormaAmortizationOfIntangibleAssets
Net income from continuing operations | 322,358 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 481,263 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 344,925 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income from continuing operations attributable to common stock | $ 303,990 pwr_BusinessAcquisitionsProFormaNetIncomeLossAttributableToCommonStock | $ 461,875 pwr_BusinessAcquisitionsProFormaNetIncomeLossAttributableToCommonStock | $ 328,898 pwr_BusinessAcquisitionsProFormaNetIncomeLossAttributableToCommonStock
Earnings per share from continuing operations attributable to common stock - basic and diluted | $ 1.37 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 2.08 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 1.52 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

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- Definition The pro forma amortization of intangible assets for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details
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- Definition The pro forma gross profit for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details
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- Definition The pro forma net income(loss) attributable to common stock for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details
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- Definition The pro forma selling, general and administrative expenses for a period as if the business combination or combinations had been completed at the beginning of the period. + References No definition available. + Details
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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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