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Acquisition - Business Acquisition Purchase Price Allocation Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |
Value of Quanta common stock and exchangeable shares issued | $ 134,500 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable | $ 88,900 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable | $ 37,300 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Cash paid | 284,300 pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred | 341,100 pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred |
Goodwill | 1,931,485 us-gaap_Goodwill | 1,780,717 us-gaap_Goodwill | 1,537,645 us-gaap_Goodwill
All Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Value of Quanta common stock and exchangeable shares issued | 134,538 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 88,895 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Cash paid | 284,312 pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 341,064 pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Fair value of total consideration transferred | 418,850 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 429,959 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Current assets | 172,298 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 193,895 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Property and equipment | 159,186 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 60,988 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Other assets | 3,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 1,009 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Identifiable intangible assets | 96,302 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 55,124 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Current liabilities | (144,252)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | (127,430)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Deferred tax liabilities, net | (37,743)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | (4,083)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Other long-term liabilities | (4,926)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | (5,350)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Total identifiable net assets | 244,365 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 174,153 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Goodwill | 174,485 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | 255,806 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |
Fair value of total consideration transferred | $ 418,850 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember | $ 429,959 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = pwr_AllAcquisitionsMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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