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Detail of Certain Balance Sheet Accounts - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Provision for long-term contract receivable | $ 49,900 pwr_ProvisionForLongtermContractReceivable | $ 52,500 pwr_ProvisionForLongtermContractReceivable | $ 102,460 pwr_ProvisionForLongtermContractReceivable
Sunrise Powerlink Project [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Provision for long-term contract receivable | $ 49,900 pwr_ProvisionForLongtermContractReceivable / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember | $ 52,500 pwr_ProvisionForLongtermContractReceivable / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember | $ 102,500 pwr_ProvisionForLongtermContractReceivable / us-gaap_TypeOfArrangementAxis = pwr_SunrisePowerlinkProjectMember

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- Definition Provision for longterm contract receivable. + References No definition available. + Details
Name: | pwr_ProvisionForLongtermContractReceivable
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | us-gaap_TypeOfArrangementAxis=pwr_SunrisePowerlinkProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |