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v3.3.1.900

Detail of Certain Balance Sheet Accounts - Additional Information (Detail) - USD ($) $ in Thousands | 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 | $ 52,500 | $ 102,460
Sunrise Powerlink Project [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Provision for long-term contract receivable |  |  | $ 102,500

X
- 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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: |