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Debt Obligations - Information on Borrowings under Current and Prior Credit Facility and Applicable Interest Rates (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Line of Credit Facility [Abstract] |  |  |  |
Maximum amount outstanding during the period | $ 465,599,000 | $ 330,473,000 | $ 518,607,000 | $ 330,473,000
Average daily amount outstanding under the credit facility | $ 426,172,000 | $ 171,638,000 | $ 449,101,000 | $ 132,213,000
Weighted-average interest rate | 2.17% | 2.01% | 2.08% | 2.13%

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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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- References No definition available. + 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

X
- 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