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Debt Obligations - Long-term Debt Obligations (Parenthetical) (Detail) | Dec. 31, 2014 | Dec. 31, 2013
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Minimum [Member] | Other Long Term Debt [Member] |  |
Debt Obligations [Line Items] |  |
Capital leases and Other long-term debt interest rates | 1.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = pwr_OtherLongTermDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 1.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = pwr_OtherLongTermDebtMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Capital Leases [Member] |  |
Debt Obligations [Line Items] |  |
Capital leases and Other long-term debt interest rates | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = pwr_CapitalLeasesMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = pwr_CapitalLeasesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member] | Other Long Term Debt [Member] |  |
Debt Obligations [Line Items] |  |
Capital leases and Other long-term debt interest rates | 4.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = pwr_OtherLongTermDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 4.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = pwr_OtherLongTermDebtMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Capital Leases [Member] |  |
Debt Obligations [Line Items] |  |
Capital leases and Other long-term debt interest rates | 7.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = pwr_CapitalLeasesMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 7.30%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = pwr_CapitalLeasesMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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