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Debt Obligations - Information on Credit Facility Borrowings (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2014
Line of Credit Facility [Abstract] |  |
Maximum amount outstanding during the period | $ 130,856 | $ 130,856
Average daily amount outstanding under the credit facility | $ 35,129 | $ 19,743
Weighted-average interest rate | 2.75% | 2.71%

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- Definition Long Term Debt Weighted Average Interest Rate During Period + References No definition available. + Details
Name: | pwr_LongTermDebtWeightedAverageInterestRateDuringPeriod
Namespace Prefix: | pwr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Average amount borrowed under the credit facility during the period. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration