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Quarterly Financial Data - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2014
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |
Provision for long-term contract receivable | $ 49,900,000 pwr_ProvisionForLongtermContractReceivable | $ 52,500,000 pwr_ProvisionForLongtermContractReceivable |  | $ 102,460,000 pwr_ProvisionForLongtermContractReceivable |  |  |
Provision for long-term contract receivable, net of tax | 30,300,000 pwr_ProvisionForLongtermContractReceivableNetOfTax | 32,300,000 pwr_ProvisionForLongtermContractReceivableNetOfTax |  |  |  |  |
Selling, general and administrative expenses |  |  |  | 722,038,000 us-gaap_SellingGeneralAndAdministrativeExpense | 501,010,000 us-gaap_SellingGeneralAndAdministrativeExpense | 434,894,000 us-gaap_SellingGeneralAndAdministrativeExpense |
Gain on sale of equity ownership interest, Pre tax |  |  | 112,700,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal |  |  |  |
Gain on sale of equity ownership interest, Net of tax |  |  | 70,500,000 pwr_EquityMethodInvestmentRealizedGainLossOnDisposalNetOfTax |  |  |  |
National Gas Company of Trinidad and Tobago Arbitration [Member] |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |
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
Selling, general and administrative expenses, Net of tax |  |  |  |  |  |  | $ 25,800,000 pwr_SellingGeneralAndAdministrativeExpenseNetOfTax / dei_LegalEntityAxis = pwr_NationalGasCompanyOfTrinidadAndTobagoArbitrationMember

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- Definition Equity Method Investment Realized Gain Loss On Disposal Net Of Tax + References No definition available. + Details
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- Definition Provision for longterm contract receivable. + References No definition available. + Details
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- Definition Provision for Longterm Contract Receivable Net of Tax + References No definition available. + Details
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- Definition Selling General And Administrative Expense Net Of Tax + References No definition available. + Details
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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References No definition available. + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34747878&loc=d3e3636-108311 + Details
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